FAA Airframe and Powerplant (A&P) Mechanic Certification Exams — Questions and Answers

Question 1: An aircraft with a total weight of 2,100 pounds has a total moment of 96,600 in-lb. What is the location of its Center of Gravity (CG)?

46.0 inches aft of datum (Correct answer)
0.0217 inches aft of datum
50.5 inches aft of datum
2,003,400 inches aft of datum

Correct answer: 46.0 inches aft of datum

The Center of Gravity (CG) is calculated by dividing the total moment by the total weight. In this case, 96,600 in-lb divided by 2,100 lbs equals 46.0 inches.

Question 2: Which airframe component is responsible for controlling roll during flight?

Elevator
Ailerons (Correct answer)
Flaps
Rudder

Correct answer: Ailerons

Ailerons are control surfaces located on the trailing edge of the wings, typically near the wingtips. They work differentially—one moves up while the other moves down—to create a rolling moment around the aircraft's longitudinal axis. This allows the pilot to control the aircraft's bank angle and initiate turns, directly controlling roll.

Question 3: What indicates a clogged or restricted aircraft fuel filter?

Low fuel pressure downstream of the filter and a differential pressure warning indication (Correct answer)
Higher fuel flow rate through the system
Higher fuel temperature readings at the engine fuel control
Increased fuel pressure on both sides of the filter

Correct answer: Low fuel pressure downstream of the filter and a differential pressure warning indication

A restricted fuel filter creates high pressure upstream and reduced pressure downstream; many aircraft are equipped with differential pressure switches that illuminate a cockpit warning when the restriction becomes critical.

Question 4: What is the primary purpose of a fuel strainer (gascolator) in an aircraft fuel system?

To prevent vapor lock in the fuel lines
To measure the quantity of fuel remaining in the tanks
To remove water and sediment from the fuel (Correct answer)
To increase fuel pressure before entering the carburetor

Correct answer: To remove water and sediment from the fuel

The fuel strainer (gascolator) filters out water and sediment from the fuel to prevent contaminants from reaching the carburetor or fuel injectors and causing engine problems.

Question 5: When forming a piece of sheet metal to a specific angle, what is the primary purpose of calculating the bend allowance?

To establish the proper setback for the bend tangent lines.
To determine the minimum bend radius to prevent cracking.
To calculate the total developed length (flat pattern) of the material needed for the part. (Correct answer)
To find the amount of springback that will occur after the bend is made.

Correct answer: To calculate the total developed length (flat pattern) of the material needed for the part.

Bend allowance is the length of the material in the bend itself, measured along the neutral axis. This value must be calculated and added to the lengths of the flat portions (legs) to determine the total length of material required for the part before it is bent. This total length is known as the developed length or flat pattern.

Question 6: In a sheet metal repair, what is the term for the distance between the centers of adjacent rivets in the same row?

Transverse Pitch
Rivet Pitch (Correct answer)
Rivet Gauge
Edge Distance

Correct answer: Rivet Pitch

Rivet pitch is defined as the distance measured along the centerline of a single row of rivets, between the centers of adjacent rivets. Transverse pitch (or rivet gauge) is the distance between rows of rivets, and edge distance is the distance from the center of a rivet to the edge of the sheet metal.

Question 7: According to AC 43.13-1B, when routing electrical wiring, what is the maximum interval between support clamps for a wire bundle?

18 inches
24 inches (Correct answer)
30 inches
12 inches

Correct answer: 24 inches

FAA Advisory Circular AC 43.13-1B, Chapter 11, states that wires and cables should be supported by suitable clamps, grommets, or other devices at intervals of not more than 24 inches, except when contained in troughs, ducts, or conduits.

Question 8: In a high-pressure pneumatic system, what is the primary function of a moisture separator?

To regulate the downstream air pressure to a constant value.
To remove entrained water vapor to prevent freezing and corrosion. (Correct answer)
To add oil to the air for lubricating pneumatic components.
To store a reserve of compressed air for emergency operations.

Correct answer: To remove entrained water vapor to prevent freezing and corrosion.

When air is compressed, its temperature rises and its ability to hold moisture decreases, causing water vapor to condense. A moisture separator is designed to remove this liquid water from the pneumatic system to prevent it from freezing at high altitudes, which could block lines, and to prevent corrosion of system components.

Question 9: What is the function of a static inverter in an aircraft electrical system?

To convert AC power to DC power for charging the battery.
To convert DC power from a battery or DC bus into AC power. (Correct answer)
To step up DC voltage to a higher DC voltage.
To rectify the output of the main AC generators.

Correct answer: To convert DC power from a battery or DC bus into AC power.

A static inverter is a solid-state electronic device that converts direct current (DC) into alternating current (AC). This is essential on many aircraft to power instruments and systems that require AC power when the main AC generators are offline, using the aircraft's battery or a DC bus as the source.

Question 10: What is the purpose of a service bulletin (SB) issued by an aircraft manufacturer?

To replace FAA regulations
To recommend voluntary maintenance actions (Correct answer)
To advertise new products
To announce price changes

Correct answer: To recommend voluntary maintenance actions

A service bulletin (SB) is issued by an aircraft manufacturer to recommend voluntary maintenance actions, inspections, or modifications to aircraft owners and operators. While not legally mandatory like an Airworthiness Directive (AD), SBs often address potential safety enhancements, performance improvements, or component life extensions, and are typically incorporated into maintenance programs.

Question 11: An aircraft's hydraulic system is equipped with an accumulator. What is a primary function of this component?

To increase the system pressure above the normal operating pressure for emergency use.
To filter contaminants from the hydraulic fluid.
To store fluid under pressure to supplement the pump and absorb pressure surges. (Correct answer)
To cool the hydraulic fluid after it passes through the pump.

Correct answer: To store fluid under pressure to supplement the pump and absorb pressure surges.

A hydraulic accumulator is a pressure storage reservoir that holds hydraulic fluid under pressure, typically from compressed nitrogen gas. Its primary functions include supplementing the system pump during peak demand, absorbing pressure surges and shocks, and providing a source of emergency pressure in the event of pump failure.

Question 12: What is the primary purpose of a voltage regulator in a DC generator or alternator system?

To increase the output voltage as engine RPM increases.
To prevent the battery from overcharging by maintaining a constant system voltage. (Correct answer)
To convert alternating current to direct current.
To act as a circuit breaker in case of a voltage spike.

Correct answer: To prevent the battery from overcharging by maintaining a constant system voltage.

The voltage regulator's main function is to monitor the aircraft's electrical system voltage and control the output of the generator or alternator to maintain a constant, predetermined voltage level, thus preventing battery overcharge and protecting electrical equipment.

Question 13: What is the role of rib stitches in fabric-covered airframes?

To house electrical wiring.
To decorate the wing surface.
To reduce wing weight.
To attach the fabric to the ribs and prevent ballooning. (Correct answer)

Correct answer: To attach the fabric to the ribs and prevent ballooning.

Rib stitches are essential in fabric-covered aircraft wings to securely attach the fabric covering to the underlying wing ribs. This prevents the fabric from lifting or 'ballooning' away from the ribs due to aerodynamic forces during flight. Maintaining this attachment ensures the wing retains its intended airfoil shape and structural integrity, crucial for safe flight.

Question 14: A technician performing a borescope inspection on a high-bypass turbofan engine discovers several small, smooth-surfaced dents on the leading edges of multiple first-stage compressor blades. What is the most likely cause of this specific type of damage?

Compressor stall or surge events
Normal operational erosion
Soft body Foreign Object Damage (FOD) (Correct answer)
Fatigue cracking due to excessive vibration

Correct answer: Soft body Foreign Object Damage (FOD)

Smooth-surfaced dents on compressor blades are characteristic of soft body ingestion, such as a bird strike. Hard body FOD (like rocks or metal) typically causes sharp nicks, gouges, and tears. Compressor stalls and fatigue result in different types of damage, usually cracks or fractures.

Question 15: In the context of aircraft weight and balance, what is the 'datum'?

The specified forward and aft points within which the CG must be located.
The weight of the aircraft including only standard equipment, unusable fuel, and full operating fluids.
An imaginary vertical plane or line from which all horizontal measurements of arm are taken. (Correct answer)
The point at which the aircraft would balance if suspended.

Correct answer: An imaginary vertical plane or line from which all horizontal measurements of arm are taken.

The datum is an imaginary vertical reference plane established by the manufacturer from which all horizontal distances (arms) are measured for weight and balance purposes.

Question 16: A technician finds a crack in a non-critical aluminum skin panel during an inspection. As a temporary repair to prevent the crack from propagating, what is the most appropriate immediate action?

Apply a bead of high-strength epoxy over the crack.
Stop-drill the ends of the crack. (Correct answer)
Weld the crack closed.
Rivet a doubler patch directly over the crack.

Correct answer: Stop-drill the ends of the crack.

Stop-drilling is a common and accepted procedure to arrest the propagation of a crack. By drilling a small hole at each tip of the crack, the stress concentration at the crack's sharp end is redistributed around the radius of the hole, which effectively stops or slows its growth until a permanent repair can be made.

Question 17: Which tool would you use to measure the inside diameter of a cylinder bore?

Torque wrench
Telescoping gauge (Correct answer)
Feeler gauge
Dial indicator

Correct answer: Telescoping gauge

A telescoping gauge is the appropriate tool for measuring the inside diameter of a cylinder bore. It features spring-loaded plungers that expand to contact the internal surfaces, then lock in place. The gauge is then removed, and its expanded dimension is accurately measured with an outside micrometer, allowing for precise internal measurements.

Question 18: What is the purpose of a fireproof bulkhead in the airframe?

To contain fires and protect critical areas. (Correct answer)
To provide extra storage space.
To reduce engine noise.
To improve aerodynamic flow.

Correct answer: To contain fires and protect critical areas.

A fireproof bulkhead, often situated between the engine compartment and the fuselage, is designed to act as a critical barrier to prevent the spread of fire. Its purpose is to contain any engine fire within its compartment, thereby protecting the aircraft's occupants, vital systems, and the rest of the airframe from heat and flames. This is a crucial safety feature.

Question 19: Which document must be completed after performing maintenance on an aircraft?

An entry in the aircraft logbook (Correct answer)
A purchase order
A verbal report to the FAA
An FAA Form 337 (for major repairs)

Correct answer: An entry in the aircraft logbook

FAA regulations (14 CFR Part 43) require that all maintenance performed on an aircraft, regardless of its scope, must be documented in the aircraft's maintenance logbooks. This entry includes details such as the work performed, date, total time in service, and the signature and certificate number of the mechanic. This logbook entry serves as a legal record of the aircraft's maintenance history and its airworthiness status.

Question 20: What is an integral fuel tank?

A removable tank that can be replaced as a unit
An aluminum tank riveted to the exterior of the aircraft
A portion of the aircraft structure that has been sealed to contain fuel (Correct answer)
A rubber bladder installed within the wing structure

Correct answer: A portion of the aircraft structure that has been sealed to contain fuel

Integral fuel tanks are created by sealing a section of the aircraft's existing structure, such as a wing bay, so that the structure itself serves as the fuel container.

Question 21: Which document is issued by the FAA to an individual aircraft, must be displayed in the aircraft, and remains valid as long as the aircraft meets its type design and is in a condition for safe operation and maintenance is performed?

Supplemental Type Certificate (STC)
Airworthiness Certificate (Correct answer)
Type Certificate Data Sheet (TCDS)
Aircraft Registration Certificate

Correct answer: Airworthiness Certificate

The Airworthiness Certificate is the FAA document that certifies an individual aircraft meets its approved design and is in a condition for safe operation. It must be displayed in the aircraft and remains effective as long as maintenance, preventive maintenance, and alterations are performed in accordance with FAA regulations.

Question 22: An A&P technician is laying out a repair pattern on a piece of 2024-T3 aluminum alloy sheet. To avoid creating potential points of failure, which of the following is the most appropriate tool for marking cut lines that will remain on the finished part?

A ballpoint pen.
A fine-tipped carbide scribe.
A steel awl.
A graphite pencil or a permanent marker. (Correct answer)

Correct answer: A graphite pencil or a permanent marker.

Using a scribe, awl, or any tool that scratches the surface of heat-treated aluminum alloys is prohibited because the scratch creates a stress riser. A stress riser is a microscopic groove that concentrates stress, potentially leading to the formation of a crack under load. A soft graphite pencil or a felt-tipped marker should be used for layout lines as they do not damage the material's surface.

Question 23: Under FAR Part 43, the aircraft fuel system is inspected as part of which required inspection interval?

Every 100 hours as part of the 100-hour inspection (Correct answer)
Every 200 hours or at annual inspection, whichever comes first
Every 50 hours of operation
Every 25 hours of operation

Correct answer: Every 100 hours as part of the 100-hour inspection

Under FAR Part 43, the fuel system is included in the required 100-hour inspection, during which all aircraft systems and components are checked for airworthiness.

Question 24: When installing new piston rings, the technician notices a small dot or the word 'TOP' on the side of a compression ring. What is the significance of this marking?

It designates the ring as being for an intake-stroke compression cycle.
It indicates the position where the ring gap should be placed.
It marks the side of the ring that must face the top of the piston. (Correct answer)
It is a manufacturer's inspection stamp and has no installation significance.

Correct answer: It marks the side of the ring that must face the top of the piston.

Markings such as a dot or 'TOP' indicate the side of the ring that must be installed facing the crown (top) of the piston. Many compression rings have a specific cross-sectional shape (e.g., beveled or tapered) that requires correct orientation to function properly for sealing and oil control.

Question 25: During a pre-flight inspection on an aircraft with a DC electrical system, a pilot notices that the ammeter shows a large, momentary positive charge immediately after engine start, which then reduces to a smaller positive value. This indicates:

The battery is being properly recharged by the generator after supplying starting power. (Correct answer)
A faulty voltage regulator.
The generator is failing to produce sufficient output.
A short circuit in the battery relay.

Correct answer: The battery is being properly recharged by the generator after supplying starting power.

After starting the engine, the battery is in a discharged state from the high current draw of the starter motor. The ammeter shows the flow of current. A large positive reading indicates that the generator (or alternator) is online and delivering a high charging current to replenish the battery. As the battery charges, its opposing voltage increases, and the charging current tapers off to a lower value, which is exactly what the scenario describes.

Question 26: After performing routine maintenance that is not a major repair or alteration, what information must be included in the maintenance record entry according to 14 CFR 43.9?

The signature, certificate number, and kind of certificate held by the person approving the work for return to service. (Correct answer)
A reference to the Airworthiness Directive (AD) that prompted the maintenance.
The owner's name and address.
The date the next inspection is due.

Correct answer: The signature, certificate number, and kind of certificate held by the person approving the work for return to service.

14 CFR 43.9 requires that for any maintenance or alteration performed, the record entry must include a description of the work, the date of completion, the name of the person performing the work (if different from the person approving it), and the signature, certificate number, and kind of certificate of the person approving the work for return to service.

Question 27: Which type of engine is commonly used in modern commercial airliners?

Reciprocating engine
High-bypass turbofan engine (Correct answer)
Ramjet engine
Turbojet engine

Correct answer: High-bypass turbofan engine

High-bypass turbofan engines are the most common type of engine used in modern commercial airliners due to their superior fuel efficiency, lower noise levels, and high thrust output. They achieve this by bypassing a large volume of air around the engine core, which contributes significantly to thrust generation and overall operational economy. This design makes them ideal for commercial aviation.

Question 28: A pilot flying an aircraft with a float-type carburetor experiences a gradual loss of RPM and engine roughness. The outside air temperature is 60°F (15°C) with high humidity. What is the most probable cause of this issue?

Carburetor icing restricting airflow to the engine. (Correct answer)
Spark plug fouling from excessive carbon buildup.
Vapor lock in the fuel lines from excessive heat.
Detonation due to an overly lean mixture.

Correct answer: Carburetor icing restricting airflow to the engine.

The combination of fuel vaporization and the venturi effect in a carburetor can cause a significant temperature drop. With high humidity, this can cause moisture in the air to freeze inside the carburetor, even at ambient temperatures as high as 70°F (21°C). This ice restricts airflow, causing a richer mixture, power loss, and engine roughness.

Question 29: When should fuel sump drains be checked by sampling fuel from the aircraft?

Only upon arrival after a long cross-country flight
Before each flight, after refueling, and after the aircraft has sat overnight or longer (Correct answer)
After every 10 hours of flight time
Only during 100-hour and annual inspections

Correct answer: Before each flight, after refueling, and after the aircraft has sat overnight or longer

Fuel sumps should be sampled before each flight, after refueling, and after any extended parking period to detect water and sediment contamination before it can cause engine failure.

Question 30: What is the function of the propeller governor in a reciprocating engine?

To maintain constant propeller RPM. (Correct answer)
To control fuel flow to the engine.
To regulate oil pressure.
To ignite the fuel-air mixture.

Correct answer: To maintain constant propeller RPM.

The propeller governor is a crucial component in constant-speed propeller systems. Its primary function is to automatically adjust the propeller blade angle (pitch) to maintain a selected engine RPM, regardless of changes in airspeed or engine power settings. This allows the engine to operate at its most efficient RPM for various flight conditions, optimizing performance and fuel economy.

Question 31: Which of the following is a primary advantage of an alternator over a generator in a light aircraft electrical system?

Alternators can produce AC power without the need for a rectifier.
Alternators are lighter and produce more stable voltage at low engine RPMs. (Correct answer)
Alternators do not require a voltage regulator for operation.
Alternators are self-exciting and can charge a completely dead battery.

Correct answer: Alternators are lighter and produce more stable voltage at low engine RPMs.

Alternators are generally lighter than generators of similar output and are capable of producing their rated power at lower engine speeds. This is a significant advantage during taxi and other low-RPM operations, preventing battery discharge.

Question 32: How often must an Annual Inspection be performed on a certificated aircraft?

Every 100 flight hours
Every 12 calendar months (Correct answer)
Every 24 months
Every 6 months

Correct answer: Every 12 calendar months

According to FAA regulations (14 CFR Part 91.409), a certificated aircraft operating under Part 91 must undergo an Annual Inspection every 12 calendar months. This inspection must be performed by an A&P mechanic holding an Inspection Authorization (IA). This ensures the aircraft remains airworthy and safe for flight operations.

Question 33: What is the purpose of the oil system in an aircraft engine?

To lubricate, cool, and clean engine components. (Correct answer)
To fuel the combustion process.
To pressurize the cabin.
To generate electrical power.

Correct answer: To lubricate, cool, and clean engine components.

The oil system in an aircraft engine performs several vital functions: it lubricates moving parts to reduce friction and wear, cools engine components by carrying away heat, and cleans the engine by suspending contaminants and carrying them to the oil filter. These combined functions are crucial for ensuring engine longevity, efficiency, and reliable operation.

Question 34: In many turbine-powered aircraft, the pneumatic system that provides compressed air for air conditioning, pressurization, and anti-icing systems primarily obtains this air from:

Ram air scoops connected to storage tanks
Electrically powered air compressors
Engine-driven vacuum pumps
The engine compressor section (bleed air) (Correct answer)

Correct answer: The engine compressor section (bleed air)

Turbine-powered aircraft typically use bleed air, which is hot, compressed air extracted from the compressor stages of the engine. This bleed air is the primary source for the pneumatic system, which then conditions and distributes it for various functions like pressurization, air conditioning, and anti-icing.

Question 35: A technician is troubleshooting a nickel-cadmium (Ni-Cd) battery that has experienced thermal runaway. Which of the following conditions is a primary contributor to this phenomenon?

Low electrolyte level causing increased internal resistance.
Excessively low charging voltage from the aircraft's bus.
A short circuit between two adjacent cells within the battery case.
High charging current combined with high battery temperature. (Correct answer)

Correct answer: High charging current combined with high battery temperature.

Thermal runaway in a Ni-Cd battery is a dangerous condition where heat generates more heat in a self-sustaining cycle. It occurs when a battery gets hot, which lowers its internal resistance. If it is connected to a constant voltage charging source, this lower resistance causes it to draw more current, which in turn creates more heat, further lowering resistance and drawing even more current until the battery is destroyed.

Question 36: After replacing a fuel control unit on a turbofan engine, the maintenance manual calls for an engine trim check. What is the primary objective of this procedure?

To adjust the fuel control to ensure the engine produces rated thrust at specified limits (Correct answer)
To verify the proper operation of the ignition system exciters
To align the engine mounts with the pylon attachment points
To balance the main rotating assemblies of the N1 and N2 spools

Correct answer: To adjust the fuel control to ensure the engine produces rated thrust at specified limits

Trimming a turbine engine involves making fine adjustments to the fuel control system. The goal is to ensure the engine's performance parameters (like Engine Pressure Ratio (EPR), fan speed (N1), or Exhaust Gas Temperature (EGT)) are within the manufacturer's specified limits for a given power lever setting, thus ensuring it can produce its rated thrust without exceeding operational limits.

Question 37: When performing a repair on a composite structure, a technician uses a scarf patch. What is the primary advantage of a scarf repair compared to an external patch repair?

It uses significantly less adhesive.
It is faster and easier to perform.
It provides a smooth, aerodynamic surface and efficient load transfer. (Correct answer)
It requires less specialized equipment for curing.

Correct answer: It provides a smooth, aerodynamic surface and efficient load transfer.

A scarf repair involves tapering the edges of the damaged area and the patch, creating a flush, bonded joint. This technique is preferred for its ability to restore a smooth aerodynamic profile and for providing a more uniform distribution of stress across the repair, leading to efficient load transfer.

Question 38: A helicopter is loaded with its center of gravity at the aft limit. During a long flight, fuel is consumed from a main tank located forward of the CG. How will this affect the helicopter's CG and handling?

The CG will shift forward, improving stability.
The CG will remain unchanged because fuel is a consumable weight.
The CG will shift aft, potentially exceeding the aft limit and reducing stability. (Correct answer)
The CG will shift aft initially, then forward as the tank empties.

Correct answer: The CG will shift aft, potentially exceeding the aft limit and reducing stability.

Removing weight (burning fuel) from a location forward of the center of gravity will cause the CG to shift aft. If the helicopter was already at its aft limit, this shift could move the CG beyond the approved range, leading to instability and control difficulties.

Question 39: What is the primary purpose of performing a routine compressor wash on a turbine engine?

To check the integrity of blade coatings and seals
To remove contaminants from airfoils to restore engine performance (Correct answer)
To provide lubrication to the compressor stator vane mechanism
To cool the hot section prior to a borescope inspection

Correct answer: To remove contaminants from airfoils to restore engine performance

A compressor wash is performed to remove accumulated dirt, salt, and other contaminants from the compressor blades and vanes. This buildup disrupts airflow, reduces compressor efficiency, and causes a rise in Exhaust Gas Temperature (EGT) for a given power setting. Washing cleans the airfoils, restoring aerodynamic efficiency and engine performance.

Question 40: An aircraft's electrical schematic shows several components, including generators, batteries, and various avionics, all connected to a central conductor. What is this primary distribution point called?

A relay panel
A bus bar (Correct answer)
A terminal strip
A junction box

Correct answer: A bus bar

A bus bar is a metallic strip or bar that serves as a common connection point for multiple electrical circuits. In an aircraft, it is the central point for distributing power from the sources (like generators and batteries) to the various loads (lights, avionics, motors, etc.).

Question 41: Which of the following is a symptom of carburetor icing?

Engine roughness or sudden RPM drop. (Correct answer)
Overboosting of the turbocharger.
Increased oil temperature.
Excessive exhaust smoke.

Correct answer: Engine roughness or sudden RPM drop.

Carburetor icing occurs when moisture in the air freezes in the carburetor venturi, restricting airflow to the engine. This leads to a rich fuel-air mixture, causing the engine to run roughly and experience a noticeable loss of power, often indicated by a sudden drop in RPM. Applying carburetor heat is the standard procedure to melt the ice and restore normal engine operation.

Question 42: While inspecting a brake system hydraulic line, a technician notices a component designed to automatically shut off fluid flow in the event of a sudden, high-rate leak, such as a ruptured line. What is this safety device called?

A hydraulic fuse (Correct answer)
A pressure relief valve
A system bypass valve
An orifice check valve

Correct answer: A hydraulic fuse

A hydraulic fuse is a safety device that automatically seals off a line if it detects a sudden increase in fluid flow rate or a specific volume of fluid loss, which is indicative of a major leak or ruptured line. This preserves the remaining fluid in the system for other essential components.

Question 43: An aircraft owner is required by 14 CFR 91.417 to keep certain maintenance records for specific periods. For how long must the records of a major alteration be retained?

For 1 year or until the work is superseded.
Until the next major inspection is performed.
For 24 calendar months.
Indefinitely, and they must be transferred with the aircraft when it is sold. (Correct answer)

Correct answer: Indefinitely, and they must be transferred with the aircraft when it is sold.

14 CFR 91.417(a)(2) specifies that records containing information on the current status of life-limited parts, time since last overhaul, current inspection status, and the status of major alterations must be retained by the owner/operator and transferred with the aircraft when it is sold. These records are considered a permanent part of the aircraft's history.

Question 44: What color is 100LL aviation gasoline?

Blue (Correct answer)
Green
Red
Purple

Correct answer: Blue

100LL avgas is dyed blue to distinguish it from other aviation fuel grades and prevent misfueling.

Question 45: An A&P mechanic completes a major repair to an aircraft's primary structure. According to 14 CFR Part 43 Appendix B, what is the required disposition of the completed FAA Form 337?

One copy attached to the work order, and one copy kept at the repair facility for at least two years.
One copy to the aircraft owner, and one copy forwarded to the FAA Aircraft Registration Branch in Oklahoma City within 48 hours. (Correct answer)
One copy to the aircraft owner, and one copy to the local FAA Flight Standards District Office (FSDO).
One copy placed in the aircraft's permanent records, and the original filed with the aircraft's Type Certificate Data Sheet.

Correct answer: One copy to the aircraft owner, and one copy forwarded to the FAA Aircraft Registration Branch in Oklahoma City within 48 hours.

14 CFR Part 43, Appendix B specifies the recording requirements for major repairs and alterations. It states that the person performing the work must execute FAA Form 337 in at least duplicate, give a signed copy to the aircraft owner, and forward a copy to the FAA Aircraft Registration Branch in Oklahoma City within 48 hours of the aircraft being approved for return to service.

Question 46: What is the function of a motive flow (jet) pump in an aircraft fuel system?

To filter motive flow fuel before it enters the engine-driven pump
To pressurize all fuel tanks above ambient atmospheric pressure
To transfer fuel from auxiliary or tip tanks to the main feed tank using engine fuel pressure and venturi effect (Correct answer)
To provide primary high-pressure fuel flow to turbine engine fuel controls

Correct answer: To transfer fuel from auxiliary or tip tanks to the main feed tank using engine fuel pressure and venturi effect

A motive flow pump uses the venturi effect, powered by high-pressure fuel from the engine, to transfer fuel from auxiliary tanks to the main feed tank without requiring electrical power or moving parts.

Question 47: An aircraft hydraulic system is powered by a constant-displacement pump. To prevent pump and system overload when no services are being operated, what component diverts the full output of the pump back to the reservoir at low pressure?

System pressure relief valve
Shuttle valve
Check valve
Unloading valve (Correct answer)

Correct answer: Unloading valve

A constant-displacement pump moves a fixed volume of fluid with each revolution. An unloading valve is used to automatically divert the pump's output to the reservoir at low pressure when system pressure reaches a set point. This 'unloads' the pump, reducing power consumption and heat generation, while a check valve maintains pressure in the system. A pressure relief valve is a safety device for over-pressurization, not for normal unloading.

Question 48: What is the minimum age requirement to obtain an FAA A&P certificate?

18 years (Correct answer)
No age requirement
21 years
16 years

Correct answer: 18 years

To obtain an FAA Airframe and Powerplant (A&P) mechanic certificate, an individual must meet several requirements, including a minimum age. The Federal Aviation Regulations (FARs) specify that an applicant must be at least 18 years old. This age requirement ensures a certain level of maturity and responsibility for individuals performing critical aircraft maintenance tasks.

Question 49: What is the definition of 'Maximum Zero Fuel Weight' (MZFW)?

The maximum authorized weight of the aircraft for takeoff.
The maximum permissible weight of a loaded aircraft (crew, passengers, cargo) before usable fuel is added. (Correct answer)
The maximum weight permitted for landing.
The weight of the aircraft with no passengers, cargo, or fuel.

Correct answer: The maximum permissible weight of a loaded aircraft (crew, passengers, cargo) before usable fuel is added.

Maximum Zero Fuel Weight is a structural limitation. It is the maximum weight allowed for the aircraft and its contents (crew, passengers, baggage, and cargo) before the weight of usable fuel is added. Any weight added above the MZFW must be fuel.

Question 50: What is the first step when troubleshooting an aircraft system?

Test-fly the aircraft
Replace suspected components
Consult the aircraft maintenance manual (Correct answer)
Disconnect the battery

Correct answer: Consult the aircraft maintenance manual

The first and most critical step when troubleshooting an aircraft system is always to consult the aircraft maintenance manual (AMM) or relevant technical documentation. These manuals provide detailed schematics, troubleshooting charts, operational limits, and specific procedures. Following these guidelines is essential for accurately diagnosing and safely resolving issues.

Question 51: During a hot section inspection, an A&P technician identifies thermal cracking on several first-stage turbine nozzle guide vanes. What is the most common cause for this type of failure?

Fuel contamination with water
A prolonged engine over-speed condition
Frequent and rapid thermal cycling (Correct answer)
Excessive vibration from the low-pressure turbine

Correct answer: Frequent and rapid thermal cycling

Thermal cracking, or thermal fatigue, is caused by the stress of repeated and rapid heating and cooling cycles. The nozzle guide vanes are directly exposed to the hottest gases from the combustor, and the temperature changes drastically between engine start-up, operation, and shutdown, leading to stress cracks over time.

Question 52: A maintenance technician needs to install a solid shank rivet with the identification code AN470AD4-8. What does the '4' in this code represent?

The rivet length in eighths of an inch.
The head style.
The rivet diameter in thirty-seconds of an inch. (Correct answer)
The material alloy.

Correct answer: The rivet diameter in thirty-seconds of an inch.

In the AN (Army-Navy) and MS (Military Standard) rivet identification system, the number immediately following the material code indicates the rivet's shank diameter in 32nds of an inch. Therefore, a '4' represents a diameter of 4/32 or 1/8 inch.

Question 53: Which material is commonly used in modern airframe construction due to its high strength-to-weight ratio?

Wood
Steel
Cast iron
Carbon fiber reinforced polymer (CFRP) (Correct answer)

Correct answer: Carbon fiber reinforced polymer (CFRP)

Carbon fiber reinforced polymer (CFRP) is widely utilized in modern airframe construction due to its exceptional strength-to-weight ratio and stiffness. This advanced composite material allows for the design of lighter, more fuel-efficient aircraft while maintaining or enhancing structural integrity compared to traditional metal alloys. Its properties contribute significantly to improved aircraft performance.

Question 54: A technician is troubleshooting an electrical issue and needs to distribute power from a single source to multiple circuits. What component is specifically designed for this purpose in an aircraft electrical system?

A bus bar (Correct answer)
A transformer-rectifier unit
An inverter
A relay

Correct answer: A bus bar

A bus bar is a metallic strip or bar that serves as a common connection point for multiple electrical circuits, distributing electricity from a single source (like a generator or battery) to various systems.

Question 55: Which of the following indicates a potential problem in a turbine engine's exhaust gas temperature (EGT)?

EGT remaining constant during throttle changes.
EGT rising above the manufacturer's specified range. (Correct answer)
EGT matching ambient temperature.
EGT decreasing during climb.

Correct answer: EGT rising above the manufacturer's specified range.

An exhaust gas temperature (EGT) rising above the manufacturer's specified range is a critical indicator of a potential problem in a turbine engine. This could signify issues such as an over-rich fuel mixture, compressor stall, or internal damage, which can lead to engine overheating and severe damage if not addressed promptly. Monitoring EGT is essential for engine health.

Question 56: What is the minimum age requirement to obtain an FAA A&P mechanic certificate?

No age requirement
21 years
18 years (Correct answer)
16 years

Correct answer: 18 years

According to FAA regulations (14 CFR Part 65.71), an applicant for an Airframe and Powerplant (A&P) mechanic certificate must be at least 18 years of age. This age requirement ensures a certain level of maturity and responsibility for individuals entrusted with the critical task of aircraft maintenance, reflecting the seriousness of the role.

Question 57: Which type of fuel metering system is most susceptible to carburetor ice formation?

Continuous-flow fuel injection
Float-type carburetor (Correct answer)
Pressure-type carburetor
Direct cylinder fuel injection

Correct answer: Float-type carburetor

Float-type carburetors are most susceptible to icing because fuel vaporization combined with the pressure drop at the venturi causes significant temperature decreases that promote ice formation.

Question 58: Under FAA rules, what is the maximum duration an aircraft can fly without an annual inspection?

36 months
6 months
12 months (Correct answer)
24 months

Correct answer: 12 months

According to FAA regulations (14 CFR Part 91.409), an aircraft must undergo an annual inspection every 12 calendar months to be considered airworthy. This comprehensive inspection ensures that the aircraft meets all applicable airworthiness requirements. Without a current annual inspection, the aircraft is not legally permitted to fly, except under specific ferry permit conditions.

Question 59: What type of pump is typically used as the electric boost pump in an aircraft fuel system?

Piston-type pump
Vane-type pump
Centrifugal pump (Correct answer)
Gear-type pump

Correct answer: Centrifugal pump

Electric boost pumps are typically centrifugal type, providing low-pressure fuel flow to assist the engine-driven pump during start and as a backup.

Question 60: The continuous thermodynamic cycle of intake, compression, constant-pressure combustion, and exhaust that describes the operation of a gas turbine engine is known as the:

Brayton cycle (Correct answer)
Rankine cycle
Otto cycle
Diesel cycle

Correct answer: Brayton cycle

The Brayton cycle is the ideal thermodynamic cycle for a gas turbine engine. It consists of four processes: isentropic compression (compressor), constant-pressure heat addition (combustor), isentropic expansion (turbine), and constant-pressure heat rejection (exhaust).

Question 61: A maintenance technician discovers a small crack propagating from a rivet hole in an aluminum alloy skin panel. According to standard repair practices, what is the immediate and primary action to be taken to prevent further propagation before a permanent repair is made?

Stop-drill the end of the crack. (Correct answer)
Replace the entire skin panel immediately.
Apply a doubler patch over the entire area.
Weld the crack closed using an approved procedure.

Correct answer: Stop-drill the end of the crack.

Stop-drilling is the correct immediate action to halt the growth of a crack. By drilling a small hole at the very tip of the crack, the sharp stress concentration at the crack's end is redistributed around the larger radius of the hole, which effectively stops or significantly slows its propagation. This allows for a permanent repair, such as a patch, to be performed later.

Question 62: Which FAA regulation specifies certification requirements for A&P mechanics?

14 CFR Part 65 (Correct answer)
14 CFR Part 91
14 CFR Part 43
14 CFR Part 21

Correct answer: 14 CFR Part 65

14 CFR Part 65, titled 'Certification: Airmen Other Than Flight Crewmembers,' specifically outlines the requirements for obtaining and maintaining various airman certificates, including those for Airframe and Powerplant (A&P) mechanics. This regulation details the eligibility, knowledge, practical, and experience requirements necessary for certification in these roles.

Question 63: In a normally aspirated reciprocating engine, what is the primary factor that causes a decrease in volumetric efficiency as the aircraft climbs to a higher altitude?

A reduction in the engine's ignition timing advance.
The congealing of engine oil in colder temperatures.
An increase in exhaust back pressure.
A decrease in the density of the ambient air. (Correct answer)

Correct answer: A decrease in the density of the ambient air.

Volumetric efficiency measures how effectively an engine fills its cylinders with the fuel/air mixture. As altitude increases, the air becomes less dense. A normally aspirated engine, which relies on atmospheric pressure to fill the cylinders, will draw in a smaller mass of air on each intake stroke, reducing its volumetric efficiency and power output.

Question 64: What is the function of the fuel selector valve in an aircraft fuel system?

To bypass the engine-driven pump during engine start
To control the fuel-to-air mixture ratio
To select which fuel tank supplies fuel to the engine (Correct answer)
To regulate fuel pressure delivered to the engine

Correct answer: To select which fuel tank supplies fuel to the engine

The fuel selector valve allows the pilot or crew to choose which fuel tank will supply fuel to the engine, enabling proper fuel management and tank balancing.

Question 65: During a major overhaul of a reciprocating engine, a crankshaft runout check is performed. What is the primary purpose of this inspection?

To verify the correct dynamic balance of the crankshaft.
To measure the wear on the main bearing journals.
To ensure the crankshaft is straight and not bent or warped. (Correct answer)
To check for cracks in the propeller flange.

Correct answer: To ensure the crankshaft is straight and not bent or warped.

Crankshaft runout inspection is performed to detect any bending or warping along the crankshaft's axis of rotation. A dial indicator is used to measure any deviation as the crank is rotated. Excessive runout indicates a bent crankshaft, which must be straightened or replaced.

Question 66: What is a primary advantage of a dry-sump lubrication system compared to a wet-sump system for a reciprocating engine used in aerobatic aircraft?

It allows the engine oil to reach operating temperature more quickly.
It requires a lower total volume of oil to operate.
It simplifies the overall system design, reducing weight and maintenance.
It provides a more consistent oil supply to components regardless of aircraft attitude. (Correct answer)

Correct answer: It provides a more consistent oil supply to components regardless of aircraft attitude.

A dry-sump system uses an external oil tank and a scavenge pump to return oil from the engine. This design ensures the pressure pump has a constant supply of oil, preventing oil starvation during aerobatic maneuvers like inverted flight where a wet-sump pickup could become uncovered.

Question 67: A technician discovers a small, localized area of corrosion on an aluminum alloy surface characterized by small holes or cavities. When the white-gray powdery deposit is removed, tiny pits are visible. What type of corrosion is this?

Intergranular corrosion
Filiform corrosion
Pitting corrosion (Correct answer)
Galvanic corrosion

Correct answer: Pitting corrosion

Pitting corrosion is a localized form of corrosion that creates small holes or pits in the metal. It is commonly identified by a white or gray powdery deposit, and upon removal, small cavities are visible on the surface. It is a serious issue, especially on aluminum and magnesium alloys.

Question 68: When preparing an aircraft for weighing to determine its empty weight, what is the standard procedure regarding the fuel in the tanks?

The fuel must be drained until only the unusable supply remains. (Correct answer)
The tanks must be completely full to ensure a known quantity.
The tanks must be completely empty, including all unusable fuel.
The fuel level is irrelevant as long as its volume is documented.

Correct answer: The fuel must be drained until only the unusable supply remains.

Standard procedure for determining empty weight requires draining the fuel system until only the unusable fuel remains. The weight of unusable fuel is part of the aircraft's empty weight. Alternatively, tanks can be full and the weight of usable fuel can be subtracted, but draining to unusable is the standard method.

Question 69: What is the purpose of a fuel primer in an aircraft?

To fill the carburetor float bowl with fuel before start
To deliver raw fuel directly to the engine intake system to enrich the mixture for cold engine starting (Correct answer)
To pressurize the fuel tanks before engine start
To clean fuel injector nozzles before engine start

Correct answer: To deliver raw fuel directly to the engine intake system to enrich the mixture for cold engine starting

A fuel primer injects raw fuel directly into the engine's intake ports or cylinders, providing the rich mixture necessary to start a cold engine when the carburetor alone cannot deliver adequate fuel.

Question 70: Which component of a turbine engine compresses incoming air before combustion?

Combustion chamber
Exhaust nozzle
Compressor (Correct answer)
Turbine

Correct answer: Compressor

In a turbine engine, the compressor is the component responsible for increasing the pressure of the incoming air before it enters the combustion chamber. This compression is a critical step for efficient combustion and for generating the high-velocity exhaust gases that produce thrust. Without proper compression, the engine cannot operate effectively.

Question 71: Which FAA regulation part specifies the requirements for obtaining an A&P mechanic certificate?

14 CFR Part 65 (Correct answer)
14 CFR Part 23
14 CFR Part 121
14 CFR Part 141

Correct answer: 14 CFR Part 65

14 CFR Part 65 of the Federal Aviation Regulations specifically outlines the requirements for certification of airmen other than flight crewmembers, which includes mechanics. This part details the eligibility, experience, knowledge, and practical skill requirements necessary to obtain an A&P mechanic certificate. Adherence to these regulations ensures that certified mechanics possess the necessary competencies to maintain aircraft safely.

Question 72: In a gas turbine engine, what is the primary function of the diffuser section located between the compressor and the combustor?

To increase the velocity and decrease the static pressure of the air.
To extract bleed air for cabin pressurization and anti-ice systems.
To decrease the velocity and increase the static pressure of the air. (Correct answer)
To mix fuel with the compressed air for ignition.

Correct answer: To decrease the velocity and increase the static pressure of the air.

The diffuser is a divergent duct that slows down the high-velocity air from the compressor. According to Bernoulli's principle, this decrease in velocity results in an increase in static pressure, creating the ideal low-velocity, high-pressure conditions required for stable and efficient combustion in the combustion chamber.

Question 73: What is the primary purpose of an airframe in an aircraft?

To store fuel exclusively.
To provide structural support and aerodynamic surfaces. (Correct answer)
To generate thrust for propulsion.
To control cabin pressurization.

Correct answer: To provide structural support and aerodynamic surfaces.

The airframe is the fundamental mechanical structure of an aircraft, encompassing components like the fuselage, wings, and empennage. Its primary purpose is to provide robust structural support to withstand flight loads and to form the necessary aerodynamic surfaces for generating lift and control. It also houses all the aircraft's systems, crew, passengers, and cargo.

Question 74: A certificated mechanic makes a maintenance record entry after performing a 100-hour inspection. Which of the following elements is specifically required by 14 CFR 43.11 for an inspection record entry?

The manufacturer of all parts installed during the inspection.
The total time in service of the aircraft and the date of the inspection. (Correct answer)
A statement certifying the aircraft was inspected and found to be in an airworthy condition.
A detailed list of every checklist item that was inspected.

Correct answer: The total time in service of the aircraft and the date of the inspection.

14 CFR 43.11 details the required content for maintenance record entries after an inspection. It explicitly requires the entry to include the date of the inspection and the aircraft's total time in service. While a certification statement is required if the aircraft is approved for return to service, the date and total time are fundamental components of the entry itself.

Question 75: In a typical aircraft AC electrical system, what is the primary function of a Constant Speed Drive (CSD) unit?

To act as a circuit breaker in the event of a generator over-speed condition.
To maintain a constant frequency output from the AC generator regardless of engine RPM changes. (Correct answer)
To regulate the voltage output of the generator by controlling the field current.
To convert DC power to AC power for the main generator.

Correct answer: To maintain a constant frequency output from the AC generator regardless of engine RPM changes.

AC generators (alternators) must rotate at a specific, constant speed to produce alternating current at a constant frequency (typically 400 Hz for aircraft). Since the engine's accessory gearbox speed varies with engine RPM, the CSD uses a hydro-mechanical transmission to ensure the generator it drives maintains this constant speed, thus ensuring a stable frequency output.

Question 76: During a pre-flight inspection, a pilot notices that a push-to-reset circuit breaker for the landing light circuit has 'popped.' What is the primary advantage of a circuit breaker over a fuse in this scenario?

Circuit breakers provide both thermal and magnetic protection.
Circuit breakers can be reset, while fuses must be replaced. (Correct answer)
Circuit breakers are less susceptible to vibration.
Circuit breakers react faster to overcurrent situations.

Correct answer: Circuit breakers can be reset, while fuses must be replaced.

The main advantage of a circuit breaker is its resettability. If a circuit breaker trips, it can be reset (after a cooling-off period and troubleshooting) without needing a replacement part, unlike a fuse which must be replaced once it blows.

Question 77: A mechanic is performing a major overhaul on a reciprocating engine. According to FAA guidelines and standard industry practice, what does this procedure entail?

A thorough cleaning and pressure test of the engine without disassembly.
Complete disassembly, inspection, repair as necessary, reassembly, and testing of the entire engine to specified limits. (Correct answer)
Replacement of all bearings and seals, with a visual inspection of other components.
Inspection and repair of cylinders and pistons only, without splitting the crankcase.

Correct answer: Complete disassembly, inspection, repair as necessary, reassembly, and testing of the entire engine to specified limits.

A major overhaul consists of the complete disassembly of an engine. The components are then inspected, repaired as necessary, reassembled, tested, and approved for return to service within the fits and limits specified by the manufacturer's overhaul data.

Question 78: Which regulatory body in the U.S. sets airframe maintenance standards for civil aircraft?

Federal Aviation Administration (FAA) (Correct answer)
National Transportation Safety Board (NTSB)
Department of Transportation (DOT)
NASA

Correct answer: Federal Aviation Administration (FAA)

The Federal Aviation Administration (FAA) is the primary regulatory body in the United States responsible for ensuring the safety of civil aviation. This includes establishing and enforcing comprehensive standards for aircraft design, manufacturing, operation, and maintenance. The FAA also certifies aviation personnel, such as A&P mechanics, to uphold these rigorous safety standards.

Question 79: What type of fire extinguisher is required in aircraft hangars?

Class D only
Water-based only
Class B and C (Correct answer)
Class A only

Correct answer: Class B and C

Aircraft hangars typically contain flammable liquids like aviation fuel and lubricants (Class B fires) and various electrical equipment (Class C fires). Therefore, fire extinguishers rated for Class B and C fires are required to effectively combat these common hazards. This ensures comprehensive fire safety for the facility and its contents.

Question 80: What is the mandatory, first procedural step before checking the nitrogen pre-charge pressure of a hydraulic system accumulator?

Cycle a nearby hydraulic actuator several times.
Operate the system until normal operating temperature is reached.
Pressurize the hydraulic system to its maximum rated value.
Ensure all hydraulic system pressure is completely discharged. (Correct answer)

Correct answer: Ensure all hydraulic system pressure is completely discharged.

To get an accurate reading of the nitrogen pre-charge, all hydraulic pressure on the fluid side of the accumulator must be released. If hydraulic pressure remains, it will compress the nitrogen, leading to a falsely high pressure reading on the charging gauge. Discharging system pressure is a critical safety and accuracy step.

Question 81: How does a fuel injection system differ from a float-type carburetor in delivering fuel?

Fuel injection meters and delivers fuel under pressure directly to the intake ports or cylinders (Correct answer)
Fuel injection requires a larger air filter and intake manifold
Fuel injection is only certified for use on turbine engines
Fuel injection uses a float chamber to control fuel level before the venturi

Correct answer: Fuel injection meters and delivers fuel under pressure directly to the intake ports or cylinders

Fuel injection systems meter and deliver fuel under pressure directly to the intake port or cylinder, providing more precise fuel metering and eliminating carburetor icing risk.

Question 82: A technician is troubleshooting an aircraft's inoperative wing anti-icing and cabin pressurization systems. Which turbine engine system is the most likely common source for both of these issues?

The compressor bleed air system. (Correct answer)
The accessory gearbox.
The engine fuel control unit.
The engine lubrication system.

Correct answer: The compressor bleed air system.

The compressor bleed air system extracts hot, high-pressure air from the engine's compressor section. This air is then ducted to various aircraft systems, including wing and engine anti-icing, cabin pressurization, and air conditioning. A fault in the bleed air supply would affect all systems that rely on it.

Question 83: Which of the following describes the primary long-term effect of operating a turbine engine at or near its maximum temperature limits, which leads to the permanent elongation of turbine blades?

Brinelling
Spalling
Galling
Creep (Correct answer)

Correct answer: Creep

Creep is the slow, permanent deformation or stretching of a material caused by prolonged exposure to high levels of stress at high temperatures. Turbine blades are under immense centrifugal stress in a very hot environment, making them susceptible to creep over their service life. Galling, spalling, and brinelling are forms of mechanical surface damage.

Question 84: A technician is servicing a large transport category aircraft hydraulic system that uses a purple-colored, phosphate-ester based fluid (Skydrol). What type of seal material MUST be used for components within this system?

Buna-N
Natural rubber
Butyl rubber or Ethylene Propylene (EPDM) (Correct answer)
Neoprene

Correct answer: Butyl rubber or Ethylene Propylene (EPDM)

Phosphate-ester based hydraulic fluids, such as Skydrol, are chemically incompatible with petroleum-based seals like Neoprene and Buna-N, which will swell and deteriorate rapidly. Systems using Skydrol require compatible seals made of materials like Butyl rubber or Ethylene Propylene Diene Monomer (EPDM).

Question 85: What is the purpose of the APU (Auxiliary Power Unit) in an aircraft?

To replace the main engines during flight.
To increase aerodynamic lift.
To act as a backup flight control system.
To provide power for ground operations and engine start. (Correct answer)

Correct answer: To provide power for ground operations and engine start.

The Auxiliary Power Unit (APU) is a small turbine engine typically located in the tail of an aircraft. Its main purpose is to provide electrical power and pneumatic (bleed air) power for various systems when the main engines are shut down on the ground. This allows for cabin lighting, air conditioning, and, most importantly, provides the necessary air pressure to start the main jet engines without external ground support.

Question 86: Jet-A turbine engine fuel appears what color in its natural state?

Clear to straw-colored (Correct answer)
Red
Green
Blue

Correct answer: Clear to straw-colored

Jet-A fuel is not dyed and appears as a clear to straw-colored liquid, unlike aviation gasoline which is color-coded by grade.

Question 87: Which type of fuel is used in turbine (jet) engines?

80/87 aviation gasoline
Jet-A or Jet-A1 kerosene-based fuel (Correct answer)
100LL aviation gasoline
High-sulfur diesel fuel

Correct answer: Jet-A or Jet-A1 kerosene-based fuel

Turbine engines use kerosene-based fuels such as Jet-A or Jet-A1, which have different energy content, flash point, and combustion characteristics than aviation gasoline.

Question 88: When comparing circuit protection devices in an aircraft, what is a key advantage of a circuit breaker over a fuse?

Circuit breakers can be reset after tripping, while a fuse must be replaced. (Correct answer)
Circuit breakers are lighter and less complex than fuses.
Circuit breakers react faster to overcurrent conditions than fuses.
Circuit breakers are not susceptible to failure from vibration.

Correct answer: Circuit breakers can be reset after tripping, while a fuse must be replaced.

The primary operational advantage of a circuit breaker is its ability to be reset after it has tripped due to an overcurrent condition. A fuse is a one-time use device; once it blows, it must be physically replaced. This reset capability is crucial in an aviation environment.

Question 89: During an engine overhaul, a mechanic installs new piston rings but aligns the gaps of all rings on one side of the piston. What is the most likely consequence if the engine is operated this way?

Significant loss of compression and engine power due to blow-by. (Correct answer)
Increased cylinder wall lubrication, leading to longer engine life.
Excessive oil consumption and fouling of the bottom spark plugs.
The piston rings will overheat and seize in their grooves.

Correct answer: Significant loss of compression and engine power due to blow-by.

Piston ring gaps must be staggered around the piston (e.g., 180 degrees apart) to create a longer path for combustion gases to travel. Aligning the gaps provides a direct path for these gases to escape past the piston into the crankcase, a condition known as blow-by, which results in a severe loss of compression and power.

Question 90: A technician observes that a hydraulic system's pressure gauge fluctuates rapidly and the system operates erratically, especially upon initial actuator movement. Which component is most likely failing to perform its function of dampening pressure surges?

Pressure relief valve
Selector valve
Sequence valve
Accumulator (Correct answer)

Correct answer: Accumulator

A primary function of a hydraulic accumulator is to absorb pressure shocks and dampen fluctuations in the hydraulic system. An accumulator that has lost its nitrogen pre-charge or has a ruptured diaphragm/bladder cannot perform this function, leading to erratic pressure and jerky operation.

Question 91: Which of the following scenarios would cause the most significant change to an aircraft's center of gravity?

Burning 60 pounds of fuel from main tanks located very close to the existing CG.
Removing a 40-pound survival kit from the forward baggage compartment at station 30.
Adding 20 pounds of oil to the engine at station -15.
A 200-pound passenger moving from a rear seat (STA 150) to a front seat (STA 70). (Correct answer)

Correct answer: A 200-pound passenger moving from a rear seat (STA 150) to a front seat (STA 70).

The greatest change in CG occurs when the largest weight is shifted over the greatest distance. A 200-pound passenger moving 80 inches (150 - 70) creates a moment change of 16,000 in-lb, which is significantly larger than the moment changes in the other options.

Question 92: According to 14 CFR Part 43, Appendix D, which of the following is an action required of a mechanic before beginning an annual or 100-hour inspection?

Drain all fuel from the aircraft's tanks and lines.
Review the pilot's flight log for the previous 90 days.
Remove or open all necessary inspection plates, access doors, fairings, and cowling. (Correct answer)
Perform a compression check on all engine cylinders.

Correct answer: Remove or open all necessary inspection plates, access doors, fairings, and cowling.

14 CFR Part 43, Appendix D, which outlines the scope and detail of annual and 100-hour inspections, explicitly states in its opening paragraph (a) that the person performing the inspection shall, before the inspection, remove or open all necessary inspection plates, access doors, fairing, and cowling, and thoroughly clean the aircraft and engine.

Question 93: What is the most common cause of water contamination in aircraft fuel tanks?

Metal particles from engine-driven fuel pump wear
Algae and microbiological growth in kerosene fuel
Water condensation forming when moist air in partially filled tanks cools (Correct answer)
Oxidation of fuel stabilizer additives

Correct answer: Water condensation forming when moist air in partially filled tanks cools

Water condensation is the most common fuel contaminant, occurring when humid air trapped in partially filled tanks condenses as ambient temperatures drop overnight.

Question 94: What color is 80/87 aviation gasoline?

Orange
Blue
Red (Correct answer)
Green

Correct answer: Red

Grade 80/87 aviation gasoline is dyed red to distinguish it from higher octane grades such as 100LL (blue) and 100/130 (green).

Question 95: What action must a mechanic take if they find an unairworthy condition during an inspection?

Record the discrepancy and prevent the aircraft from being used until repaired (Correct answer)
Notify the pilot but allow the flight to proceed
Ignore it if it's minor
Only report it to the FAA after 30 days

Correct answer: Record the discrepancy and prevent the aircraft from being used until repaired

If an A&P mechanic discovers an unairworthy condition during an inspection, they are legally and ethically obligated to record the discrepancy in the aircraft's logbook. More importantly, they must prevent the aircraft from being returned to service until the condition is rectified and the aircraft is deemed airworthy again. This strict adherence to safety ensures the protection of pilots, passengers, and the public.

Question 96: What is the primary purpose of a crossfeed fuel system in a multi-engine aircraft?

To transfer fuel between tanks for lateral balance only
To provide an alternate fuel path in case the main pump fails
To allow any engine to draw fuel from any tank on the aircraft (Correct answer)
To preheat fuel before it enters the turbine engine

Correct answer: To allow any engine to draw fuel from any tank on the aircraft

A crossfeed system allows each engine to draw fuel from any tank, providing fuel management flexibility and enabling continued operation in the event of a fuel pump or engine failure.

Question 97: What is the function of a wing spar in the airframe?

To reduce drag during flight.
To provide the primary structural support for the wings. (Correct answer)
To control the aircraft's yaw.
To house the fuel tanks.

Correct answer: To provide the primary structural support for the wings.

Wing spars are the primary structural members that run spanwise through the wings, extending from the fuselage to the wingtip. Their crucial function is to carry the main bending loads and shear forces experienced by the wing during flight. This provides the essential strength and rigidity required for the wing structure to support the aircraft.

Question 98: A pilot reports hearing a loud bang from the engine, followed by a rapid rise in Exhaust Gas Temperature (EGT) and a loss of thrust. These symptoms are most indicative of which condition?

Hung start
Compressor stall or surge (Correct answer)
Hot start
Flameout

Correct answer: Compressor stall or surge

A compressor stall or surge is a breakdown of airflow through the compressor. This disruption can cause a momentary or complete reversal of airflow, resulting in a loud bang. The disruption starves the combustor of air, leading to an overly rich fuel-air mixture that burns in the turbine section, causing a rapid EGT spike and a significant loss of thrust.

Question 99: What is the purpose of an FAA Form 337?

To request a mechanic's license renewal
To record major repairs or alterations (Correct answer)
To report an aircraft accident
To order aircraft parts

Correct answer: To record major repairs or alterations

An FAA Form 337, "Major Repair and Alteration," is a mandatory document used to record significant maintenance actions that affect an aircraft's airworthiness. This form details the work performed, the materials used, and the methods employed for major repairs or alterations. It ensures that such critical changes are properly documented and approved, maintaining a comprehensive record of the aircraft's configuration and compliance with safety standards.

Question 100: Which inspection method is used to detect cracks in airframe components without disassembly?

Destructive testing.
Visual inspection only.
Pressure washing.
Dye penetrant inspection. (Correct answer)

Correct answer: Dye penetrant inspection.

Dye penetrant inspection (DPI) is a non-destructive testing (NDT) method specifically used to detect surface-breaking defects like cracks in non-porous materials without disassembling components. It involves applying a penetrant that seeps into flaws, followed by a developer that draws the penetrant out, making the defects visible. This allows for efficient and effective crack detection.

Question 101: A technician is reconditioning a set of cylinders during a top overhaul. The process of creating a specific cross-hatch pattern on the cylinder walls is known as:

Reaming
Glazing
Honing (Correct answer)
Lapping

Correct answer: Honing

Honing is the process of using abrasive stones to create a specific cross-hatch pattern on the cylinder wall. This pattern is crucial for proper piston ring seating and for retaining a film of oil to lubricate the rings.

Question 102: A technician is approved to perform a minor repair on a small nick in a compressor blade by blending. Which of the following is a critical requirement for a successful blending repair?

The repair area must be polished to a mirror finish to reduce friction.
The repair must have smooth, generous radii to prevent stress concentrations. (Correct answer)
The blade's weight must be increased slightly to counteract the removal of material.
A minimum amount of material should be removed, leaving sharp edges to cut the air cleanly.

Correct answer: The repair must have smooth, generous radii to prevent stress concentrations.

The most critical principle of blending is to create a smooth, contoured depression with generous radii. This eliminates the sharp edges of the original damage, which act as stress risers where a fatigue crack could form. A sharp-edged or V-shaped repair would create new stress concentrations and is unacceptable.

Question 103: During a landing gear retraction sequence, the landing gear doors must open fully before the gear begins to retract. Which type of valve is specifically designed to control the sequence of operations between two branches of a hydraulic circuit?

Priority valve
Shuttle valve
Check valve
Sequence valve (Correct answer)

Correct answer: Sequence valve

A sequence valve is designed to control the order of operations in a hydraulic circuit. It ensures that one action, such as opening the gear doors, is completed before the next action, such as retracting the gear, begins. A shuttle valve selects between normal and emergency pressure sources, a check valve allows one-way flow, and a priority valve ensures critical systems receive pressure first if system pressure drops.

Question 104: What is the primary function of the powerplant in an aircraft?

To control cabin pressurization.
To generate thrust or power for flight. (Correct answer)
To provide structural support for the wings.
To house the flight crew.

Correct answer: To generate thrust or power for flight.

The powerplant of an aircraft refers to the engine(s) and associated systems that generate the necessary thrust or power to propel the aircraft through the air. Whether it's a reciprocating engine or a turbine engine, its primary function is to convert fuel into mechanical energy, enabling flight. Without the powerplant, the aircraft cannot achieve propulsion.

Question 105: According to FAA regulations, who is authorized to approve an aircraft for return to service after major repairs?

The aircraft owner
Any A&P mechanic
A commercial pilot
A mechanic with an Inspection Authorization (IA) (Correct answer)

Correct answer: A mechanic with an Inspection Authorization (IA)

According to FAA regulations (14 CFR Part 65), only a mechanic holding an Inspection Authorization (IA) is authorized to approve an aircraft for return to service after major repairs or alterations. This additional certification signifies that the mechanic has met specific experience and knowledge requirements to perform and supervise complex maintenance tasks, ensuring the aircraft's continued airworthiness.

Question 106: During a visual inspection of a fuselage, a technician notices fine black streaks trailing back from several rivet heads. This phenomenon, commonly referred to as 'smoking,' is a primary indicator of which of the following conditions?

Galvanic corrosion between the rivet and the skin material.
Improper application of primer around the rivet head.
Fretting corrosion caused by slight movement of a loose rivet. (Correct answer)
Overheating of the rivet during installation.

Correct answer: Fretting corrosion caused by slight movement of a loose rivet.

The term 'smoking rivets' describes the fine black powder (aluminum oxide) that is worked out from under the rivet head due to slight, repeated movement under load or vibration. This movement is a form of fretting, which causes microscopic wear on the rivet and the surrounding skin, indicating the rivet is loose and its clamping force is compromised.

Question 107: What is the primary purpose of an Airworthiness Directive (AD)?

To mandate safety-related repairs or inspections (Correct answer)
To schedule routine maintenance
To announce new aircraft models
To suggest optional upgrades

Correct answer: To mandate safety-related repairs or inspections

An Airworthiness Directive (AD) is a legally binding regulation issued by the FAA (or equivalent authority) to address unsafe conditions found in aircraft, engines, propellers, or appliances. ADs mandate specific inspections, repairs, or modifications that must be accomplished within a specified timeframe to ensure the continued airworthiness and safety of the affected aircraft. Compliance with ADs is mandatory for all aircraft owners and operators.

Question 108: A technician is performing an internal timing check on a magneto. The E-gap is defined as the point where the:

distributor rotor is perfectly aligned with a contact.
magnet is at its full register or strongest position.
breaker points begin to open, a few degrees of rotation past the magnetic neutral position. (Correct answer)
breaker points are at their maximum opening.

Correct answer: breaker points begin to open, a few degrees of rotation past the magnetic neutral position.

The E-gap, or efficiency gap, is the precise point in the magneto's rotation, just past the neutral position, where the breaker contact points are set to open. This position ensures the most rapid rate of change in magnetic flux, which induces the maximum voltage in the primary coil for the strongest spark.

Question 109: What is the purpose of the magneto in a reciprocating engine?

To cool the engine.
To generate spark for ignition. (Correct answer)
To provide electrical power to the cockpit.
To lubricate the cylinders.

Correct answer: To generate spark for ignition.

In a reciprocating engine, the magneto is an engine-driven electrical generator that produces high-voltage electrical pulses independently of the aircraft's main electrical system. These pulses are sent to the spark plugs to create the spark necessary to ignite the fuel-air mixture in the cylinders, initiating combustion. It is a vital part of the ignition system.

Question 110: What is the primary structural difference between a monocoque and a semi-monocoque fuselage construction?

Semi-monocoque fuselages rely solely on the skin to carry all structural loads.
Semi-monocoque fuselages use a substructure of stringers and formers to reinforce the skin. (Correct answer)
Monocoque fuselages use a steel tube truss for primary strength.
Monocoque fuselages are exclusively made of composite materials.

Correct answer: Semi-monocoque fuselages use a substructure of stringers and formers to reinforce the skin.

A true monocoque fuselage relies almost entirely on its skin to carry bending and twisting loads. A semi-monocoque design, which is far more common in modern aircraft, reinforces the skin with longitudinal members (stringers and longerons) and transverse members (frames, formers, and bulkheads). This substructure shares the loads with the skin, preventing buckling and increasing overall strength.

Question 111: What is the correct action if water is found during a fuel sump drain check?

Add an approved fuel additive to absorb the water and proceed with flight
Add additional fuel to dilute the water to an acceptable level
Continue draining until only clean fuel flows; ground the aircraft if water persists and have a mechanic inspect (Correct answer)
Fly the aircraft normally since water sinks and will not reach the engine

Correct answer: Continue draining until only clean fuel flows; ground the aircraft if water persists and have a mechanic inspect

The correct procedure is to continue draining until only clean, uncontaminated fuel flows; if water continues to appear, the aircraft must be grounded and inspected by an A&P mechanic.

Question 112: How often must an A&P mechanic complete recurrent training to maintain their certificate?

No recurrent training is required (Correct answer)
Only when changing employers
Every 2 years
Every 6 months

Correct answer: No recurrent training is required

Unlike pilots, FAA-certified A&P mechanics are not required to complete recurrent training to maintain the validity of their certificate. However, they must remain current in their knowledge and skills to exercise the privileges of their certificate. Many mechanics choose to attend industry seminars or manufacturer training to stay updated with new technologies and regulations, but it is not a regulatory requirement for certificate renewal.

Question 113: What is the purpose of corrosion prevention in airframe maintenance?

To improve fuel efficiency.
To maintain structural strength and longevity. (Correct answer)
To enhance the aircraft's paint finish.
To reduce radio interference.

Correct answer: To maintain structural strength and longevity.

Corrosion prevention is paramount in airframe maintenance because corrosion can severely degrade the structural integrity of aircraft components, leading to reduced strength and potential failure. Implementing effective corrosion control measures ensures the aircraft's continued airworthiness, extends its service life, and maintains overall flight safety. It is a continuous process.

Question 114: A technician needs to service a large transport category aircraft's hydraulic system which is known to use a phosphate ester-based fluid. Which of the following fluids should be used?

Skydrol (Correct answer)
MIL-H-83282
MIL-H-5606
MIL-H-6083

Correct answer: Skydrol

Skydrol is a common brand name for phosphate ester-based hydraulic fluid, which is widely used in commercial transport category aircraft due to its fire-resistant properties. MIL-H-5606 and MIL-H-6083 are mineral-based fluids, and MIL-H-83282 is a synthetic hydrocarbon-based fluid; mixing these types is prohibited and can damage system seals and components.

Question 115: What is 'vapor lock' in an aircraft fuel system?

A safety lock on the fuel filler cap to prevent overfilling
A mechanical seizure of the fuel selector valve
A condition where fuel vaporizes in the lines, blocking adequate fuel flow to the engine (Correct answer)
A blockage caused by debris in the fuel vent line

Correct answer: A condition where fuel vaporizes in the lines, blocking adequate fuel flow to the engine

Vapor lock occurs when fuel vaporizes within the fuel lines or pump, creating a vapor barrier that prevents adequate liquid fuel flow to the engine.

Question 116: What does a fuel quantity transmitter (sender unit) do in an aircraft fuel system?

It transmits fuel pressure readings to the cockpit indicator
It converts the fuel level in the tank to an electrical signal that drives the cockpit fuel quantity gauge (Correct answer)
It controls the fuel flow rate from the tank to the boost pump
It transmits fuel temperature data to the engine control unit

Correct answer: It converts the fuel level in the tank to an electrical signal that drives the cockpit fuel quantity gauge

A fuel quantity transmitter uses a float or capacitance-type sensor to convert the fuel level in the tank into an electrical signal, which is then displayed on the cockpit fuel quantity gauge.

Question 117: After reassembling a reciprocating engine, a technician must secure numerous fasteners, such as connecting rod bolts and crankcase through-bolts. What is the primary purpose of using safety wire on these critical fasteners?

To ground the components electrically and prevent static buildup.
To act as a positive locking device to prevent loosening from vibration. (Correct answer)
To indicate if a fastener has been previously tampered with.
To provide a secondary method of applying torque to the fastener.

Correct answer: To act as a positive locking device to prevent loosening from vibration.

Safety wire is a positive locking device used to prevent fasteners from loosening due to vibration and other forces. It is installed in such a way that it applies a tightening force if the fastener begins to loosen.

Question 118: Which of the following is a critical maintenance step for pneumatic de-icing boots to ensure their longevity and proper operation?

Painting them with standard aircraft paint to protect against UV radiation.
Inflating them to maximum pressure for 24 hours annually to check for leaks.
Applying a thick layer of grease to prevent cracking.
Regularly cleaning them with approved agents and applying a rubber preservative. (Correct answer)

Correct answer: Regularly cleaning them with approved agents and applying a rubber preservative.

Proper maintenance of pneumatic de-icing boots includes regular cleaning with mild soap and water or approved chemical cleaners to remove debris. Additionally, applying manufacturer-approved rubber preservatives (like AgeMaster) protects the neoprene from ozone and weathering, which prevents cracking and extends the service life of the boots.

Question 119: The process of heating an aluminum alloy to a specific temperature, holding it there for a predetermined time, and then rapidly cooling it (quenching) is performed primarily to:

Enhance its electrical conductivity.
Improve its strength and hardness. (Correct answer)
Relieve internal stresses from manufacturing.
Increase its corrosion resistance.

Correct answer: Improve its strength and hardness.

This process describes solution heat treatment followed by quenching. For heat-treatable aluminum alloys (like the 2xxx, 6xxx, and 7xxx series), this procedure is the first step in a hardening process. It puts the alloying elements into a solid solution, and the rapid quench traps them, significantly increasing the material's strength and hardness after aging.

Question 120: Which FAA regulation part governs the certification and maintenance of airframe and powerplant mechanics?

14 CFR Part 91
14 CFR Part 61
14 CFR Part 25
14 CFR Part 43 (Correct answer)

Correct answer: 14 CFR Part 43

14 CFR Part 43, titled 'Maintenance, Preventive Maintenance, Rebuilding, and Alteration,' outlines the general rules governing these activities for aircraft. It specifies who can perform these actions, the methods, techniques, and practices to be used, and the record-keeping requirements. This regulation directly impacts A&P mechanics by defining the scope and standards of their work.

Question 121: Which of the following best describes the primary function of the baffles and flexible seals within the cowling of an air-cooled aircraft engine?

To reduce engine noise and vibration felt in the cockpit.
To create aerodynamic lift over the engine nacelle.
To act as a firewall by preventing oil from contacting hot exhaust components.
To direct the flow of cooling air tightly against the cylinder cooling fins. (Correct answer)

Correct answer: To direct the flow of cooling air tightly against the cylinder cooling fins.

Baffles and seals are critical components of a pressure cooling system. They form a high-pressure area above and in front of the cylinders and a low-pressure area below and behind them. This pressure differential forces cooling air to move through the cylinder cooling fins, ensuring heat is effectively carried away from the engine.

Question 122: What is the primary purpose of the "fir-tree" root design commonly used to attach turbine blades to the turbine disk?

To act as a heat sink, drawing heat away from the blade airfoil.
To create a lightweight connection that reduces rotational mass.
To securely attach the blade while accommodating thermal expansion and high centrifugal loads. (Correct answer)
To simplify the manufacturing and machining of the turbine disk.

Correct answer: To securely attach the blade while accommodating thermal expansion and high centrifugal loads.

The fir-tree root has multiple serrations that evenly distribute the immense centrifugal forces generated by the rotating blade. This design provides a secure attachment while also allowing for slight movement as the blade and disk expand at different rates due to extreme temperatures, preventing excessive stress buildup.

Question 123: Which FAA document must be completed after performing a major repair?

FAA Form 8500
FAA Form 8130
FAA Form 337 (Correct answer)
FAA Form 8610

Correct answer: FAA Form 337

FAA Form 337, titled 'Major Repair and Alteration,' is the mandatory document that must be completed and submitted to the FAA after any major repair or alteration is performed on an aircraft. This form provides a detailed record of the work accomplished, the materials used, and the approved data referenced. It ensures compliance with airworthiness regulations and maintains a complete history of significant aircraft modifications.

Question 124: Which of the following statements most accurately describes the primary source of thrust in a high-bypass turbofan engine?

Thrust is generated almost exclusively by the high-velocity exhaust gases exiting the core engine.
Thrust is equally divided between the fan section and the core exhaust gases.
The majority of thrust is produced by the large fan section accelerating a mass of ducted air that bypasses the engine core. (Correct answer)
All thrust is generated by the expansion of hot gases in the turbine section driving the fan.

Correct answer: The majority of thrust is produced by the large fan section accelerating a mass of ducted air that bypasses the engine core.

In a high-bypass turbofan engine, a large fan at the front moves a significant mass of air. Most of this air (often over 80%) is ducted around the core engine (bypass air) and accelerated rearward, producing the majority of the engine's total thrust. The remaining air goes through the core, which primarily serves to power the fan.

Question 125: Which of the following is the primary purpose of a hydraulic sequence valve in a landing gear system?

To store hydraulic fluid for emergency gear extension.
To allow fluid to flow in one direction only.
To regulate system pressure to a predetermined maximum.
To ensure the gear doors are open before the gear begins to extend. (Correct answer)

Correct answer: To ensure the gear doors are open before the gear begins to extend.

Sequence valves are used to control the order of operations in a hydraulic circuit. In a landing gear system, a sequence valve ensures that the gear doors are fully open before hydraulic pressure is directed to the landing gear actuator, preventing mechanical damage.

Question 126: Which of the following statements is true regarding the installation of piston rings on a piston during a reciprocating engine overhaul?

All piston rings are symmetrical and can be installed in any direction.
Ring gaps should be staggered around the piston to prevent excessive blow-by. (Correct answer)
The oil control ring is typically installed last, after the compression rings.
Ring gaps should always be aligned to minimize cylinder wear.

Correct answer: Ring gaps should be staggered around the piston to prevent excessive blow-by.

Piston ring gaps are staggered (e.g., 120 or 180 degrees apart) to create a longer path for combustion gases to travel, thus minimizing blow-by and improving compression. Aligning the gaps would create a direct path for gas leakage.

Question 127: Which of the following solid shank rivets, known as an 'icebox' rivet, must be heat-treated and then stored at low temperatures until it is driven to prevent age hardening?

5056-H32 (B)
1100-F (A)
2117-T3 (AD)
2024-T4 (DD) (Correct answer)

Correct answer: 2024-T4 (DD)

Rivets made from 2024 aluminum alloy (identified by two raised dashes or the code 'DD') are solution-heat-treated to soften them for driving. They begin to age-harden rapidly at room temperature, so they must be stored in a freezer ('icebox') and driven within a short period after removal (typically 10-20 minutes) to remain malleable.

Question 128: An aircraft's 24-volt lead-acid battery has 12 cells. What is the approximate voltage of each cell when the battery is fully charged?

1.2 volts
1.5 volts
2.1 volts (Correct answer)
3.0 volts

Correct answer: 2.1 volts

A fully charged lead-acid battery cell has a nominal voltage of approximately 2.1 to 2.2 volts. In a 24-volt battery, there are 12 cells connected in series (12 cells x 2.1 volts/cell = 25.2 volts).

Question 129: What is the purpose of fuel tank vents in an aircraft fuel system?

To maintain atmospheric pressure in the tank and allow proper fuel flow as fuel is consumed (Correct answer)
To release excess fuel pressure during climb
To allow fuel quantity gauges to reference atmospheric pressure
To provide a drain point for water removal from the tank

Correct answer: To maintain atmospheric pressure in the tank and allow proper fuel flow as fuel is consumed

Fuel tank vents maintain atmospheric pressure inside the tanks, preventing tank collapse from internal vacuum and ensuring consistent fuel flow to the engine as fuel is consumed.

FAA Airframe and Powerplant (A&P) Mechanic Certification Exams

This certification qualifies individuals to inspect, maintain, and repair aircraft airframes and powerplants, ensuring aviation safety and airworthiness.

300

Questions

300 min

Time Limit

70%

To Pass

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