Aircraft Maintenance Engineer (AME) License Exams — Questions and Answers

Question 1: What is the primary function of a fuel boost pump in an aircraft fuel system?

To maintain positive fuel pressure, prevent vapor lock, and supply the engine-driven pump (Correct answer)
To transfer fuel between tanks for lateral balance only
To filter contaminants from fuel before engine delivery
To measure fuel quantity electronically

Correct answer: To maintain positive fuel pressure, prevent vapor lock, and supply the engine-driven pump

Fuel boost pumps maintain positive pressure in the supply line to prevent vapor lock and ensure adequate fuel delivery to the engine-driven pump, especially during takeoff and climb.

Question 2: An AME is troubleshooting an aircraft hydraulic system and observes that the system pressure fluctuates rapidly and excessively when a component is operated. The pump is known to be in good condition. What is the most likely cause of this issue?

The accumulator has lost its nitrogen pre-charge. (Correct answer)
The system filter is completely clogged.
The hydraulic fluid is contaminated with water.
The system relief valve is stuck in the open position.

Correct answer: The accumulator has lost its nitrogen pre-charge.

The primary function of an accumulator is to dampen pressure surges and supplement pump flow. If the nitrogen pre-charge is lost, the accumulator's diaphragm or piston has no gaseous 'cushion' to absorb pressure spikes from pump operation and component actuation, leading to rapid and excessive pressure fluctuations.

Question 3: What typically happens to a constant-speed propeller if the governor oil pressure is lost?

The blades move to low pitch (fine)
The blades move to high pitch (coarse) or feather (Correct answer)
The propeller immediately overspeeds
The blades freeze in their current position

Correct answer: The blades move to high pitch (coarse) or feather

Most constant-speed propellers are designed so that loss of oil pressure causes blades to move toward high pitch or feather as a fail-safe against overspeeding.

Question 4: The purpose of propeller synchrophasing on multi-engine aircraft is to:

Prevent both engines from failing simultaneously
Maintain equal thrust from each propeller
Balance fuel consumption between engines
Ensure both propellers rotate at identical RPM and phase relationship to reduce cabin noise (Correct answer)

Correct answer: Ensure both propellers rotate at identical RPM and phase relationship to reduce cabin noise

Synchrophasing sets both propeller RPM and their rotational phase angle to minimize the beat frequency noise that causes cabin vibration.

Question 5: Introducing the wrong fuel type into an aircraft (e.g., Jet-A into an avgas aircraft) is specifically called:

Cross-contamination
Incorrect servicing
Fuel substitution
Misfueling (Correct answer)

Correct answer: Misfueling

Misfueling refers to the introduction of the wrong fuel type into an aircraft, which can cause engine failure and is one of the most serious maintenance errors.

Question 6: What is the purpose of valve overlap in a 4-stroke reciprocating engine?

To prevent valve float at high RPM power settings
To allow intake and exhaust valves to cool between opening events
To synchronize ignition timing precisely with valve events
To improve scavenging of exhaust gases and increase volumetric efficiency (Correct answer)

Correct answer: To improve scavenging of exhaust gases and increase volumetric efficiency

Valve overlap — both intake and exhaust valves briefly open simultaneously near TDC — allows outgoing exhaust gases to help draw in fresh charge, improving cylinder filling.

Question 7: During a routine inspection of a 24-volt lead-acid battery, an AME notices a significant difference in specific gravity readings between individual cells (e.g., one cell is 1.275 while another is 1.220). What is the most appropriate action?

Replace the battery as it is likely nearing the end of its service life. (Correct answer)
Top off the low cell with distilled water and return to service.
Charge the battery and re-check the specific gravity.
Add sulfuric acid to the low cell to equalize the specific gravity.

Correct answer: Replace the battery as it is likely nearing the end of its service life.

A specific gravity difference of 0.050 or more between cells in a lead-acid battery indicates that the battery is approaching the end of its useful life and should be considered for replacement. Topping off with water or simply recharging will not fix the underlying issue of a failing cell. Adding acid is never the correct procedure for adjusting specific gravity in the field.

Question 8: A turbofan engine is operating at a constant high-altitude cruise. If the density of the air entering the engine decreases, what is the most likely effect on engine performance, assuming RPM remains constant?

Thrust will decrease due to reduced mass airflow. (Correct answer)
Exhaust gas temperature (EGT) will decrease.
Thrust will increase due to lower air resistance.
Fuel consumption will decrease significantly.

Correct answer: Thrust will decrease due to reduced mass airflow.

Thrust is a product of mass airflow and the change in velocity. At a constant RPM, the compressor moves a constant volume of air. If the air density decreases, the mass of that air (mass airflow) also decreases. This reduction in mass airflow directly leads to a decrease in the thrust produced by the engine.

Question 9: An aircraft fuel vent system primarily prevents:

Fuel evaporation during long-term storage
Fuel contamination from water entry through vent openings
Fuel overflow during ground fueling operations
Tank structural collapse or rupture from pressure differential during altitude changes (Correct answer)

Correct answer: Tank structural collapse or rupture from pressure differential during altitude changes

Fuel vent systems equalize pressure between tanks and atmosphere, preventing the tank structure from being subjected to excessive differential pressure as altitude changes.

Question 10: What is the function of the power enrichment (economizer) circuit in an aircraft float carburetor?

To enrich the mixture at high power settings to prevent detonation and provide cylinder cooling (Correct answer)
To prevent fuel starvation during sustained inverted flight maneuvers
To automatically lean the mixture during steady cruise for fuel economy
To provide additional fuel flow during cold-start primer operation

Correct answer: To enrich the mixture at high power settings to prevent detonation and provide cylinder cooling

The power enrichment circuit enriches the mixture above a set throttle position to lower combustion temperature, reducing the risk of detonation and thermal damage at high power.

Question 11: An aircraft is being prepared for flight at a remote station without ground power available. The AME needs to power the ground handling bus to operate the cargo bay lights and refueling system. Which power source would typically be used in this scenario?

The main aircraft battery via an inverter.
The main engine-driven generators.
The Auxiliary Power Unit (APU) generator. (Correct answer)
A Ram Air Turbine (RAT).

Correct answer: The Auxiliary Power Unit (APU) generator.

The ground handling bus is typically powered by the APU generator or an external power unit. Since external power is unavailable, the APU would be started to provide electrical power for ground operations like cargo lighting and refueling without needing to start the main engines.

Question 12: What is the significance of air traffic control (ATC) regulations?

To monitor passenger behavior.
To guide aircraft safely and efficiently in the airspace (Correct answer)
To improve flight entertainment.
To manage flight crew salaries.

Correct answer: To guide aircraft safely and efficiently in the airspace

Air traffic control (ATC) regulations are significant because they provide the framework for guiding aircraft safely and efficiently through the airspace. These regulations dictate procedures for takeoff, landing, and en-route flight, preventing collisions and managing the flow of air traffic. ATC ensures an organized and secure environment for all aircraft operations.

Question 13: Why are aircraft fuselage structures designed with pressurization in mind?

To increase the aircraft's speed.
To ensure safety and comfort by maintaining cabin pressure (Correct answer)
To reduce weight and increase fuel efficiency.
To improve the aerodynamics of the aircraft.

Correct answer: To ensure safety and comfort by maintaining cabin pressure

Aircraft fuselage structures are designed with pressurization in mind to ensure the safety and comfort of occupants at high altitudes. As an aircraft climbs, the external atmospheric pressure drops significantly, making it unsafe for human respiration. Pressurization maintains a breathable and comfortable cabin pressure, preventing altitude sickness and allowing for normal physiological function.

Question 14: An aircraft structural repair requires joining a carbon steel fitting to an aluminum alloy bulkhead. To prevent galvanic corrosion, what is the most critical action the AME must take?

Apply a thick layer of grease between the two surfaces.
Isolate the dissimilar metals with a suitable non-conductive barrier or sealant. (Correct answer)
Ensure a metal-to-metal contact for proper electrical bonding.
Use aluminum rivets to attach the steel fitting.

Correct answer: Isolate the dissimilar metals with a suitable non-conductive barrier or sealant.

Galvanic corrosion occurs when two dissimilar metals are in contact in the presence of an electrolyte. To prevent this, the metals must be electrically isolated from each other. This is typically achieved by applying a layer of primer, sealant, or a non-conductive material like vinyl tape between the surfaces.

Question 15: Which of the following NDT (Non-Destructive Testing) methods is most suitable for detecting subsurface delaminations in a carbon fiber composite wing skin that are not visible from the surface?

Visual Inspection with a magnifying glass
Ultrasonic Inspection (Correct answer)
Dye Penetrant Inspection
Eddy Current Inspection

Correct answer: Ultrasonic Inspection

Ultrasonic inspection is the most widely used and effective method for detecting subsurface defects like delaminations and disbonds in composite structures. High-frequency sound waves are introduced into the material, and the reflections are analyzed to identify internal flaws. Dye penetrant and visual inspections are limited to surface defects, and eddy current is primarily used for conductive materials.

Question 16: In accordance with 14 CFR Part 25, if a fuse is essential for safety in flight and is accessible to the flight crew, what is the minimum number of spare fuses that must be carried on board?

A quantity sufficient to replace all essential fuses once.
One spare for each essential fuse.
At least 25% of the number of fuses of each required rating.
At least 50% of the number of fuses of each required rating. (Correct answer)

Correct answer: At least 50% of the number of fuses of each required rating.

14 CFR § 25.1357(d) states: "Where fuses are used, there must be spare fuses for use in flight equal to at least 50% of the number of fuses of each rating required for complete circuit protection." This regulation ensures that sufficient spares are available for critical systems.

Question 17: Which of the following is the BEST example of an 'error-trapping' technique in aircraft maintenance?

Attending a human factors refresher course annually.
Taking a short break when feeling fatigued.
An independent inspection performed by a second qualified AME. (Correct answer)
Using a detailed checklist for a complex task.

Correct answer: An independent inspection performed by a second qualified AME.

Error-trapping involves implementing a specific check or process designed to catch an error before it has consequences. An independent inspection is a classic example, as its sole purpose is to verify the work of the first AME and 'trap' any potential errors. While checklists and managing fatigue are important for error prevention, the independent check is a direct trapping mechanism.

Question 18: Which of the following describes the primary function of the turbine section in a gas turbine engine?

To mix fuel with compressed air and ignite the mixture.
To increase the pressure of the air entering the combustion chamber.
To decrease the velocity of the exhaust gases to prevent structural damage.
To drive the compressor and accessories by extracting energy from the hot gas stream. (Correct answer)

Correct answer: To drive the compressor and accessories by extracting energy from the hot gas stream.

The turbine section's main purpose is to extract kinetic and thermal energy from the high-velocity hot gases exiting the combustion chamber. This extracted energy is converted into mechanical power to rotate the main shaft, which in turn drives the compressor section and engine-driven accessories.

Question 19: What is the purpose of dynamic counterweights installed on an aircraft reciprocating engine crankshaft?

To add rotational inertia for smoother idling at low RPM
To compensate for minor propeller blade track differences
To dampen torsional vibration at critical resonant RPM ranges (Correct answer)
To balance oil distribution through the crankshaft passages

Correct answer: To dampen torsional vibration at critical resonant RPM ranges

Dynamic counterweights are pendulum-type dampers tuned to absorb and cancel specific torsional vibration harmonics that develop at critical crankshaft speeds.

Question 20: During an inspection of an aluminum alloy landing gear component, a type of corrosion is found that proceeds along the grain boundaries of the metal. This form of corrosion is not readily visible on the surface in its early stages. What is this type of corrosion called?

Intergranular Corrosion (Correct answer)
Filiform Corrosion
Pitting Corrosion
Surface Corrosion

Correct answer: Intergranular Corrosion

Intergranular corrosion is an attack along the grain boundaries of an alloy. It is often caused by improper heat treatment and can significantly weaken the material from within, making it difficult to detect visually until it becomes severe.

Question 21: What is the primary purpose of aircraft maintenance procedures?

To ensure the aircraft remains operational and compliant with standards (Correct answer)
To improve the aircraft's speed.
To increase the weight of the aircraft.
To reduce fuel efficiency.

Correct answer: To ensure the aircraft remains operational and compliant with standards

The primary purpose of aircraft maintenance procedures is to ensure the aircraft remains fully operational, safe, and compliant with stringent aviation standards. Regular maintenance prevents failures, extends the lifespan of components, and addresses potential issues before they become critical. This systematic approach is vital for airworthiness and passenger safety.

Question 22: According to Canadian Aviation Regulations (CARs), what is the minimum age requirement for an individual to be issued an Aircraft Maintenance Engineer (AME) licence?

21 years (Correct answer)
25 years
There is no minimum age, only an experience requirement.
18 years

Correct answer: 21 years

CAR 566.03 outlines the requirements for the issuance of an AME Licence. Among these requirements, an applicant must have attained the age of 21 years prior to the licence being issued.

Question 23: What is the role of the aviation safety management system (SMS)?

To track passenger complaints.
To monitor aircraft fuel consumption.
To assess flight crew performance.
To provide a structured approach to identifying and managing aviation safety risks (Correct answer)

Correct answer: To provide a structured approach to identifying and managing aviation safety risks

The aviation safety management system (SMS) is crucial because it provides a structured and systematic approach to identifying, assessing, and managing aviation safety risks. SMS moves beyond reactive incident investigation to proactively identify hazards and implement preventative measures. This comprehensive framework helps organizations continuously improve their safety performance and reduce the likelihood of accidents.

Question 24: Who holds the ultimate responsibility for ensuring that all required maintenance has been carried out before an aircraft flight?

The Approved Maintenance Organization (AMO).
The AME who signed the last maintenance release.
The Pilot-in-Command (PIC).
The aircraft owner or operator. (Correct answer)

Correct answer: The aircraft owner or operator.

While the AME is responsible for the work they perform and certify, regulations across jurisdictions (including ICAO standards, EASA, FAA, and Transport Canada) place the final responsibility for the aircraft's airworthy condition on the owner or operator. They must ensure all required maintenance, including compliance with airworthiness directives, is completed before flight.

Question 25: Why are aircraft maintenance records important for regulatory compliance?

To assess passenger comfort.
To determine the number of flight hours.
To track repairs and ensure compliance with safety regulations (Correct answer)
To monitor fuel consumption.

Correct answer: To track repairs and ensure compliance with safety regulations

Aircraft maintenance records are extremely important for regulatory compliance as they provide a verifiable history of all repairs, inspections, and modifications performed on an aircraft. These records demonstrate that the aircraft has been maintained according to established safety regulations and manufacturer guidelines. Regulatory bodies rely on these detailed logs to ensure ongoing airworthiness and accountability.

Question 26: A maintenance technician is inspecting the combustion section of a gas turbine engine. Which of the following is a primary function of this section?

To reduce the temperature of the gas stream before it enters the turbine.
To extract mechanical energy to power the engine's accessories.
To add chemical energy to the compressed air by burning fuel at a constant pressure. (Correct answer)
To increase the mass of air flowing through the engine using bypass ducts.

Correct answer: To add chemical energy to the compressed air by burning fuel at a constant pressure.

The combustion chamber's primary role is to add energy to the system. It does this by mixing fuel with the high-pressure air from the compressor and burning the mixture. This combustion process occurs at a relatively constant pressure and dramatically increases the temperature and volume of the gases before they enter the turbine.

Question 27: Which of the following describes a 'trip-free' circuit breaker?

A circuit breaker that requires a special tool to be reset.
A circuit breaker that cannot be manually reset until it has cooled down.
A circuit breaker that will open a circuit even if the operating control is held in the 'ON' position. (Correct answer)
A circuit breaker that can be reset remotely from the cockpit.

Correct answer: A circuit breaker that will open a circuit even if the operating control is held in the 'ON' position.

A 'trip-free' circuit breaker is a safety feature designed to ensure that it will open the circuit during an overload or fault condition, regardless of whether the manual operating lever or button is held in the closed (ON) position. This prevents the crew from forcing a circuit to remain closed against a persistent fault.

Question 28: An AME has just completed a scheduled 100-hour inspection on a privately operated, Canadian-registered Cessna 172. Which of the following is the correct action the AME must take to approve the aircraft for return to service?

Issue a new Certificate of Airworthiness for the aircraft.
Verbally inform the owner that the aircraft is ready for flight.
Notify the nearest Transport Canada Centre of the completed inspection.
Complete and sign a maintenance release in the aircraft's technical records. (Correct answer)

Correct answer: Complete and sign a maintenance release in the aircraft's technical records.

CAR 571.10 requires that a maintenance release be completed after specified maintenance tasks, including scheduled inspections. This release is a formal declaration entered into the aircraft's technical records, signed by a qualified AME, certifying that the maintenance was performed in accordance with applicable standards of airworthiness.

Question 29: Why is the Federal Aviation Administration (FAA) critical to aviation safety?

It monitors airline profits.
It schedules flights.
It establishes and enforces aviation safety regulations and standards (Correct answer)
It reduces operational costs.

Correct answer: It establishes and enforces aviation safety regulations and standards

The Federal Aviation Administration (FAA) is critical to aviation safety in the United States because it is the primary regulatory body responsible for establishing and enforcing aviation safety regulations and standards. The FAA oversees all aspects of civil aviation, including aircraft certification, pilot licensing, air traffic control, and maintenance practices. Its rigorous oversight ensures a consistent level of safety across the national airspace.

Question 30: How can error codes help in aircraft troubleshooting?

By requiring manual calculations.
By helping technicians identify the issue and target repairs (Correct answer)
By providing unrelated information.
By delaying the repair process.

Correct answer: By helping technicians identify the issue and target repairs

Error codes are digital signals generated by aircraft systems when a fault or malfunction is detected. These codes are specific indicators that point directly to the problematic system or component, significantly streamlining the troubleshooting process. By interpreting these codes, technicians can quickly narrow down the potential causes of a failure, allowing them to target repairs precisely and efficiently without extensive manual searching.

Question 31: What is the primary objective of an engine break-in procedure after overhaul or cylinder replacement?

To flush manufacturing residue and metal particles from the oil system
To seat new piston rings against the cylinder walls to establish proper compression and oil sealing (Correct answer)
To verify that maximum power output meets the engine's type certificate specifications
To calibrate the fuel injection system to the correct fuel flow schedule

Correct answer: To seat new piston rings against the cylinder walls to establish proper compression and oil sealing

Break-in procedures run the engine through defined power cycles so that new piston rings wear in and conform to the microscopic contours of the cylinder walls, establishing proper gas sealing and oil control.

Question 32: What is the primary function of applying carburetor heat in a piston-engine aircraft?

To prevent or eliminate ice formation inside the carburetor (Correct answer)
To pre-heat the induction air before cold engine start
To increase engine power during high-altitude cruise
To lean the fuel-air mixture during descent

Correct answer: To prevent or eliminate ice formation inside the carburetor

Carburetor heat routes warm air from around the exhaust manifold into the induction system to raise air temperature above freezing and prevent or melt carburetor ice.

Question 33: A technician is performing a sheet metal repair on a non-pressurized fuselage section. The maintenance manual specifies installing a doubler over the damaged area. What is the standard practice for the material thickness of this doubler?

One gauge thicker than the original skin. (Correct answer)
The same thickness as the original skin.
Half the thickness of the original skin.
Two gauges thinner than the original skin.

Correct answer: One gauge thicker than the original skin.

For a standard doubler repair, the doubler should be made of the same material as the original skin but should be one gauge (or size) thicker to ensure the repair restores the required strength to the damaged area.

Question 34: What does TDC stand for as used in reciprocating engine terminology?

Terminal Drive Cycle
Top Drive Compression
Total Dead Center
Top Dead Center (Correct answer)

Correct answer: Top Dead Center

TDC (Top Dead Center) is the piston position at its highest point in the cylinder bore, marking the boundary between the compression and power strokes.

Question 35: In the context of the Brayton cycle as it applies to a gas turbine engine, what process occurs within the combustion chamber?

Isentropic expansion
Constant-volume heat addition
Isentropic compression
Constant-pressure heat addition (Correct answer)

Correct answer: Constant-pressure heat addition

The Brayton cycle is the thermodynamic model for gas turbine engines. The process within the combustor, where fuel is burned to heat the compressed air, is modeled as a constant-pressure (isobaric) heat addition process.

Question 36: What is the proper procedure before entering an aircraft fuel tank for internal inspection?

Purge fuel vapors, verify safety with a gas detector, and follow confined space entry procedures (Correct answer)
Enter immediately after defueling to minimize exposure time
Use a portable fan to blow fresh air in for 5 minutes before entry
Wear only a dust mask since fuel vapors are not toxic in small quantities

Correct answer: Purge fuel vapors, verify safety with a gas detector, and follow confined space entry procedures

Fuel tank entry requires complete vapor purging, confirmation with a calibrated gas detector that vapors are below explosive and toxic levels, and full confined space procedures.

Question 37: An Approved Maintenance Organization (AMO) in Canada is primarily regulated under which part of the Canadian Aviation Regulations (CARs)?

CAR Part VI - General Operating and Flight Rules
CAR Part V - Airworthiness (Correct answer)
CAR Part IV - Personnel Licensing and Training
CAR Part VII - Commercial Air Services

Correct answer: CAR Part V - Airworthiness

CAR Part V, specifically Subpart 573 (CAR 573), covers the approval and regulation of Approved Maintenance Organizations (AMOs). This part details the requirements for facilities, personnel, equipment, and procedures that an organization must meet to be certified to perform maintenance on aircraft.

Question 38: A propeller static balance check ensures:

The propeller generates equal thrust from all blades
The propeller can withstand centrifugal force loads
Each blade has the same pitch angle
The center of gravity of the propeller assembly is on the axis of rotation (Correct answer)

Correct answer: The center of gravity of the propeller assembly is on the axis of rotation

Static balance ensures the propeller's center of gravity coincides with its rotational axis, preventing vibration when spinning.

Question 39: What is the primary aerodynamic benefit of installing winglets on an aircraft's wingtips?

To increase the critical Mach number.
To act as primary control surfaces for roll.
To reduce induced drag by weakening wingtip vortices. (Correct answer)
To increase the structural rigidity of the wing.

Correct answer: To reduce induced drag by weakening wingtip vortices.

Winglets are designed to reduce induced drag, which is created by wingtip vortices. By limiting the formation and strength of these vortices, winglets improve the wing's efficiency, leading to benefits like reduced fuel consumption and increased range.

Question 40: To maintain the recency of an AME licence, what is the minimum duration an AME must have performed or supervised maintenance, or acted in an executive capacity in a maintenance organization, within the preceding 24 months?

6 months (Correct answer)
3 months
12 months
18 months

Correct answer: 6 months

CAR 566.05 specifies the recency requirements for an AME licence. To exercise the privileges of the licence, the holder must, within the preceding 24 months, have performed or supervised aircraft maintenance, acted in an executive capacity, or taught aviation maintenance for at least a six-month period.

Question 41: In a modern Flight Management System (FMS), what is the primary source of real-time, high-accuracy position information used to continuously update and correct the aircraft's calculated position?

Global Positioning System (GPS) (Correct answer)
Air Data Computer (ADC) calculations
Inertial Reference System (IRS) free-inertial calculation
VOR/DME radio navigation inputs

Correct answer: Global Positioning System (GPS)

While the FMS uses a blend of sensors for position determination, the Global Positioning System (GPS) is the primary source for accurate, continuous, and global position updating. The Inertial Reference System (IRS) calculates position but is subject to drift over time and relies on updates from GPS to maintain its accuracy.

Question 42: On an aircraft equipped with an Engine Indicating and Crew Alerting System (EICAS), a 'HYD QTY LOW' message appears in amber. What does this color typically signify?

An advisory message indicating a system's status.
A caution requiring immediate crew awareness and possible future action. (Correct answer)
A warning requiring immediate and urgent crew action.
A failure of the EICAS display unit itself.

Correct answer: A caution requiring immediate crew awareness and possible future action.

EICAS uses a standardized color scheme to denote the urgency of a message. Red is used for warnings (immediate action required), while amber (or yellow) is used for cautions, which require immediate crew awareness but may not require immediate action.

Question 43: Why are airport security regulations important?

To increase airport profits.
To ensure safety by preventing security threats and unauthorized access (Correct answer)
To monitor the behavior of airport staff.
To manage passenger comfort.

Correct answer: To ensure safety by preventing security threats and unauthorized access

Airport security regulations are paramount for safeguarding passengers, staff, and aircraft from potential threats. These regulations establish rigorous protocols, such as passenger and baggage screenings and access controls, specifically designed to deter and detect security breaches. By preventing unauthorized access or the introduction of dangerous items, they maintain a secure environment essential for safe aviation operations.

Question 44: Why is pilot training compliance crucial to aviation safety?

To reduce flight time.
To ensure pilots can manage aircraft systems.
To ensure pilots meet safety standards and are qualified for safe flight operations (Correct answer)
To limit the number of passengers on board.

Correct answer: To ensure pilots meet safety standards and are qualified for safe flight operations

Pilot training compliance is fundamental to aviation safety because it ensures that pilots possess the necessary knowledge, skills, and experience to operate aircraft safely and proficiently. Regulatory bodies set stringent standards for initial training, certification, and recurrent checks to ensure pilots are competent in all aspects of flight, including emergency procedures. This rigorous adherence to training protocols minimizes human error and significantly contributes to the overall safety of flights.

Question 45: Which of the following non-destructive testing (NDT) methods is most suitable for detecting subsurface defects in a non-ferrous material like an aluminum wing spar?

Magnetic Particle Inspection
Eddy Current Inspection
Ultrasonic Inspection (Correct answer)
Dye Penetrant Inspection

Correct answer: Ultrasonic Inspection

Ultrasonic inspection is highly effective for detecting subsurface flaws like cracks and corrosion in both ferrous and non-ferrous materials. Magnetic particle inspection only works on ferromagnetic materials. Dye penetrant is for surface-breaking defects only. Eddy current is primarily for surface and near-surface defects.

Question 46: What is the primary goal of aviation safety regulations?

To monitor airline employee behavior.
To ensure the safety of passengers, crew, and aircraft (Correct answer)
To regulate airline schedules.
To increase airline profits.

Correct answer: To ensure the safety of passengers, crew, and aircraft

The primary goal of aviation safety regulations is to ensure the highest possible level of safety for passengers, crew, and the aircraft itself. These regulations establish standards and procedures for aircraft design, manufacturing, operation, and maintenance. By enforcing these rules, regulatory bodies aim to minimize risks and prevent accidents across the aviation industry.

Question 47: A composite propeller blade inspection should include checking for:

Corrosion pitting on the blade surface
Blade tip burnishing from high-speed rotation
Delamination, disbonding, impact damage, and erosion of the protective coating (Correct answer)
Metal fatigue cracks only

Correct answer: Delamination, disbonding, impact damage, and erosion of the protective coating

Composite propeller blades are vulnerable to delamination, disbonding between layers, impact damage, and erosion that can compromise structural integrity.

Question 48: What does a low manifold absolute pressure (MAP) reading at full throttle indicate on a normally aspirated reciprocating engine?

Normal operation at cruise altitude
Excessive fuel enrichment causing back-pressure
High outside air temperature reducing induction air density
A possible induction system air leak or restriction (Correct answer)

Correct answer: A possible induction system air leak or restriction

On a normally aspirated engine at full throttle, MAP should approach ambient pressure; a significantly lower reading indicates an induction system leak or obstruction preventing full atmospheric pressure from reaching the intake.

Question 49: When performing a dye penetrant inspection, what is the primary purpose of the developer?

To draw the penetrant out of the discontinuity by capillary action, making it visible. (Correct answer)
To clean the surface of the material before applying the penetrant.
To remove excess penetrant from the surface after the dwell time.
To etch the surface of the material to open up small cracks.

Correct answer: To draw the penetrant out of the discontinuity by capillary action, making it visible.

In a liquid dye penetrant inspection, the developer acts as a blotter, drawing the penetrant that has seeped into a crack or flaw back to the surface. This action, known as capillary action, makes the indication visible against the contrasting background of the developer.

Question 50: Which system is responsible for the aircraft's landing gear operation?

The avionics system.
The environmental control system.
The hydraulic system (Correct answer)
The fuel system.

Correct answer: The hydraulic system

The hydraulic system is primarily responsible for the operation of the aircraft's landing gear. It provides the immense power needed to extend and retract the heavy landing gear components smoothly and reliably. This system ensures that the aircraft can safely take off and land by controlling the deployment and stowage of the gear.

Question 51: Why are aircraft materials chosen for their strength-to-weight ratio?

To reduce fuel consumption and increase efficiency (Correct answer)
To increase the aircraft's overall weight.
To decrease the aircraft's operational costs.
To simplify the aircraft's design.

Correct answer: To reduce fuel consumption and increase efficiency

Aircraft materials are meticulously chosen for their high strength-to-weight ratio to significantly reduce the aircraft's overall weight. Lighter aircraft require less fuel to operate, directly leading to reduced fuel consumption and increased operational efficiency. This material selection is crucial for achieving optimal performance, range, and cost-effectiveness in aviation.

Question 52: Which of the following is considered the primary cause of wear and malfunction in the majority of aircraft hydraulic systems?

Entrained air causing cavitation.
Fluid viscosity breakdown due to high temperatures.
Particulate contamination in the fluid. (Correct answer)
Chemical breakdown from exposure to UV light.

Correct answer: Particulate contamination in the fluid.

Particulate contamination is widely recognized as the leading cause of hydraulic system problems, accounting for a vast majority of failures. Tiny particles of metal, rubber, and dirt act as an abrasive, causing scoring and wear on the precision-machined surfaces of pumps, valves, and actuators, which leads to internal leakage, reduced efficiency, and eventual component failure.

Question 53: A maintenance engineer is working a long overnight shift and recognizes they are feeling the effects of fatigue. According to human factors principles, what is the most effective immediate countermeasure to mitigate the risk of error?

Informing their supervisor and taking a short, strategic nap if permitted. (Correct answer)
Increasing the hangar lighting to maximum brightness.
Drinking a large coffee for a quick energy boost.
Rushing to complete the final tasks to finish the shift sooner.

Correct answer: Informing their supervisor and taking a short, strategic nap if permitted.

While caffeine can provide a temporary mask for fatigue, it doesn't resolve the underlying physiological need for rest. The most effective physiological countermeasure for fatigue is sleep. Taking a short, strategic nap has been shown to improve performance. Informing a supervisor is also a critical safety step in a Fatigue Risk Management System (FRMS).

Question 54: An AME is performing a visual inspection on a section of aluminum alloy aircraft skin and observes small, white or gray powdery deposits. This is indicative of which type of corrosion?

Surface corrosion (Correct answer)
Filiform corrosion
Fretting corrosion
Pitting corrosion

Correct answer: Surface corrosion

Surface corrosion is the most common type of corrosion on aluminum and magnesium alloys. It is characterized by a uniform attack on the surface, which first appears as a general dulling or etching of the surface, and then progresses to form white or gray powdery deposits.

Question 55: Why is regular inspection of aircraft structures important?

To monitor the aircraft's fuel usage.
To identify and prevent potential safety issues (Correct answer)
To monitor engine performance.
To reduce the number of passengers.

Correct answer: To identify and prevent potential safety issues

Regular inspection of aircraft structures is critically important to identify and prevent potential safety issues before they escalate. Inspections allow technicians to detect fatigue, corrosion, cracks, or other forms of damage that could compromise the aircraft's structural integrity. Early detection through routine checks is key to maintaining airworthiness and preventing catastrophic failures.

Question 56: Propeller 'tracking' is a maintenance check that verifies:

Blade angle settings are within specified tolerance
Each blade tip follows the same plane of rotation (Correct answer)
The propeller governor is correctly calibrated
The propeller RPM is within limits

Correct answer: Each blade tip follows the same plane of rotation

Tracking ensures all propeller blade tips rotate in the same plane, indicating the hub is not bent and blades are properly installed.

Question 57: What does an excessive RPM drop on one magneto during the pre-takeoff magneto check most likely indicate?

Carburetor heat is inadvertently still applied during the run-up
The engine is operating normally and within limits on that magneto
The engine has not yet reached proper operating temperature
A defect in that magneto's circuit such as a fouled spark plug, faulty ignition lead, or internal magneto fault (Correct answer)

Correct answer: A defect in that magneto's circuit such as a fouled spark plug, faulty ignition lead, or internal magneto fault

An excessive single-magneto RPM drop beyond the manufacturer's limit indicates a problem in that ignition circuit, most commonly a fouled or failed spark plug or a defective ignition lead.

Question 58: What is the primary purpose of a constant-speed propeller governor?

To maintain a constant blade angle regardless of airspeed
To prevent propeller overspeed by reducing throttle
To synchronize propeller rotation with engine firing order
To maintain a constant engine RPM by varying blade pitch (Correct answer)

Correct answer: To maintain a constant engine RPM by varying blade pitch

A constant-speed governor maintains engine RPM by automatically adjusting propeller blade pitch to match varying flight conditions.

Question 59: An experienced AME is performing a routine inspection that they have done hundreds of times. They begin to skip a few steps in the checklist, assuming everything is normal as it usually is. This behaviour is a primary example of which human factors error?

Stress
Distraction
Complacency (Correct answer)
Lack of Knowledge

Correct answer: Complacency

Complacency is a significant human factor error where extensive experience on a repetitive task leads to a false sense of security. This causes the individual to become less vigilant and potentially skip crucial steps. The AME's assumption that everything is normal because it always has been is a classic sign of complacency.

Question 60: What is the function of the aircraft's avionics system?

To monitor and control the aircraft's electronics, navigation, and communication systems (Correct answer)
To manage the fuel system.
To regulate cabin pressure.
To control the aircraft's speed.

Correct answer: To monitor and control the aircraft's electronics, navigation, and communication systems

The aircraft's avionics system encompasses all the electronic systems used for flight control, navigation, communication, and monitoring. It acts as the aircraft's central nervous system, processing vast amounts of data to assist the pilot and automate various functions. This system is indispensable for modern flight operations, ensuring safe and efficient travel.

Question 61: Which of the following digital data bus standards is characterized by a unidirectional, twisted-pair wire connection that transmits 32-bit words at either a low speed (12.5 kbps) or a high speed (100 kbps)?

ARINC 664 (AFDX)
ARINC 429 (Correct answer)
CAN bus
MIL-STD-1553

Correct answer: ARINC 429

ARINC 429 is the predominant avionics data bus for commercial and transport aircraft. Its key characteristics include using a unidirectional (one transmitter, up to 20 receivers), twisted-pair wire, and transmitting 32-bit data words at either a low speed (12.5-14.5 kbps) or high speed (100 kbps).

Question 62: Propeller blade 'twist' (varying pitch from root to tip) exists because:

Aerodynamic forces twist the blade during high-power operation
The blade tip moves faster than the root, requiring a lower angle at the tip for uniform efficiency (Correct answer)
The twist compensates for the asymmetric disc effect
Manufacturing tolerances cause unavoidable pitch variation

Correct answer: The blade tip moves faster than the root, requiring a lower angle at the tip for uniform efficiency

Propeller blades are twisted so that the tip (moving faster) has a lower pitch angle than the root, maintaining a consistent angle of attack along the entire blade length.

Question 63: What is the primary function of a Constant Speed Drive (CSD) unit in an aircraft's AC electrical system?

To regulate the voltage output of the generator.
To act as a circuit breaker in case of an electrical fault.
To convert variable engine RPM into a constant generator RPM. (Correct answer)
To rectify alternating current (AC) to direct current (DC).

Correct answer: To convert variable engine RPM into a constant generator RPM.

The primary purpose of a Constant Speed Drive (CSD) is to take the variable rotational speed from the engine's accessory gearbox and convert it into a constant speed for the AC generator. This ensures the generator produces a stable frequency (typically 400 Hz) required by aircraft systems, regardless of changes in engine thrust.

Question 64: Why is it important to follow repair manuals during aircraft repairs?

To ensure the repair is done safely and in accordance with manufacturer guidelines (Correct answer)
To make the repair process quicker.
To improve the aesthetic appearance of the aircraft.
To reduce the number of inspections.

Correct answer: To ensure the repair is done safely and in accordance with manufacturer guidelines

Repair manuals contain detailed, step-by-step instructions, specifications, and warnings provided by the aircraft manufacturer. Adhering to these manuals during repairs is crucial to ensure that every procedure is performed correctly, safely, and to the exact standards required for airworthiness. Deviating from these guidelines can compromise the aircraft's structural integrity, operational reliability, and overall safety, potentially leading to catastrophic failures.

Question 65: What is the function of the aircraft's electrical system?

To maintain cabin pressure.
To power avionics, lights, and other essential equipment (Correct answer)
To provide power to the aircraft's engines.
To control fuel distribution.

Correct answer: To power avionics, lights, and other essential equipment

The aircraft's electrical system is fundamental for powering a vast array of components essential for flight. It supplies electricity to the avionics, cabin lighting, navigation lights, environmental control systems, and many other critical pieces of equipment. This robust system ensures that all necessary electrical functions are operational throughout the flight.

Question 66: When selecting the proper wire size for an electrical installation in an aircraft, which of the following is a critical factor according to the American Wire Gauge (AWG) standard?

The brand of the wire manufacturer.
The wire's flexibility rating.
The wire's cross-sectional area. (Correct answer)
The color of the wire insulation.

Correct answer: The wire's cross-sectional area.

The American Wire Gauge (AWG) system sizes wires based on their diameter and corresponding cross-sectional area. A smaller AWG number indicates a larger wire diameter and greater current-carrying capacity. The cross-sectional area is the primary factor in determining the wire's resistance and ability to handle current without overheating.

Question 67: What is a fire extinguisher 'squib' on an aircraft?

A reusable valve that can be manually reset after discharge
The pressure gauge on the fire extinguisher bottle
A small pyrotechnic device that punctures the extinguisher container to release the agent when activated (Correct answer)
The electrical connector for the fire detection loop

Correct answer: A small pyrotechnic device that punctures the extinguisher container to release the agent when activated

A squib is a pyrotechnic initiator that, when electrically activated, fires to pierce the extinguisher container's frangible disc and release the suppression agent into the fire zone.

Question 68: What is the purpose of using diagnostic tools during troubleshooting?

To speed up the repair process.
To monitor passenger comfort.
To reduce the need for inspections.
To help identify and analyze faults in aircraft systems (Correct answer)

Correct answer: To help identify and analyze faults in aircraft systems

Diagnostic tools are specialized equipment designed to interface with aircraft systems to read data, interpret error codes, and perform system checks. Their purpose is to provide technicians with precise information about the health and performance of various components, helping to pinpoint the exact location and nature of a fault. This detailed analysis significantly reduces troubleshooting time and ensures accurate problem identification, leading to more effective repairs.

Question 69: How is compression ratio defined for a reciprocating engine cylinder?

The ratio of cylinder bore diameter to piston stroke length
The ratio of intake manifold pressure to exhaust back-pressure
The ratio of fuel injection pressure to induction air pressure
The ratio of total cylinder volume at BDC to clearance volume at TDC (Correct answer)

Correct answer: The ratio of total cylinder volume at BDC to clearance volume at TDC

Compression ratio equals the total cylinder volume when the piston is at BDC (swept volume plus clearance volume) divided by the remaining clearance volume at TDC.

Question 70: What is the purpose of the aircraft's wing structure?

To manage engine performance.
To generate lift and support the aircraft's weight (Correct answer)
To control the aircraft's speed.
To control the aircraft's altitude.

Correct answer: To generate lift and support the aircraft's weight

The primary purpose of the aircraft's wing structure is to generate lift, which counteracts gravity and allows the aircraft to fly. The shape of the wings, known as an airfoil, creates a pressure differential that produces upward force. Additionally, wings are designed to support the aircraft's weight, including engines and fuel, and house various systems.

Question 71: What is the function of an aircraft troubleshooting checklist?

To monitor fuel efficiency.
To increase the complexity of the repair.
To track the number of flight hours.
To provide a systematic approach to diagnosing and fixing problems (Correct answer)

Correct answer: To provide a systematic approach to diagnosing and fixing problems

An aircraft troubleshooting checklist serves as a structured guide for maintenance technicians, outlining a logical sequence of steps to diagnose and resolve system malfunctions. It ensures that no critical steps are missed, promoting thoroughness and consistency in the troubleshooting process. This systematic approach helps in efficiently identifying the root cause of a problem, leading to accurate and effective repairs while minimizing diagnostic errors.

Question 72: What is 'blade angle' in propeller terminology?

The angle between the leading edge and trailing edge
The angle at which the propeller is mounted on the engine shaft
The angle between the blade chord line and the plane of rotation (Correct answer)
The sweep angle of the blade from root to tip

Correct answer: The angle between the blade chord line and the plane of rotation

Blade angle (pitch angle) is measured between the blade chord line and the plane of rotation, determining how much air is deflected with each revolution.

Question 73: What is the function of an aircraft maintenance checklist?

To monitor the aircraft's fuel efficiency.
To reduce the number of maintenance checks.
To increase the complexity of maintenance tasks.
To guide maintenance technicians and ensure all tasks are completed (Correct answer)

Correct answer: To guide maintenance technicians and ensure all tasks are completed

An aircraft maintenance checklist is an essential tool that guides maintenance technicians through complex tasks, ensuring all necessary steps are completed accurately and systematically. It helps prevent omissions, ensures adherence to established procedures, and promotes consistency in maintenance operations. This systematic approach is critical for maintaining safety standards and preventing errors.

Question 74: Which of the following best describes the primary function of an Attitude and Heading Reference System (AHRS)?

To provide long-range navigation data using GPS and inertial sensors.
To provide aircraft attitude (pitch, roll) and heading information to the flight displays. (Correct answer)
To monitor engine parameters and alert the crew to system malfunctions.
To calculate optimal flight paths and fuel consumption.

Correct answer: To provide aircraft attitude (pitch, roll) and heading information to the flight displays.

An Attitude and Heading Reference System (AHRS) is designed to replace traditional mechanical gyroscopic instruments. It uses solid-state sensors like accelerometers, gyroscopes, and magnetometers to compute and output the aircraft's pitch, roll, and yaw, which is then sent to the EFIS displays, autopilot, and other systems.

Question 75: What is the function of the aircraft's emergency systems in compliance with safety regulations?

To increase the weight of the aircraft.
To monitor the fuel system.
To provide essential safety systems for emergency situations (Correct answer)
To improve the aircraft's aerodynamics.

Correct answer: To provide essential safety systems for emergency situations

Aircraft emergency systems are critical components mandated by safety regulations to ensure the survival and well-being of occupants during unforeseen events. These systems, which include emergency exits, oxygen masks, and fire suppression, are designed to activate in situations like engine failure or cabin depressurization. Their primary function is to provide immediate and effective responses, maximizing safety and minimizing risks when an emergency occurs.

Question 76: In the context of the SHEL model for analyzing human factors, which component represents the rules, procedures, and manuals used by maintenance personnel?

Hardware
Software (Correct answer)
Liveware
Environment

Correct answer: Software

The SHEL model uses 'Software' to describe the non-physical aspects of the system, including rules, procedures, regulations, manuals, and checklists that govern the maintenance task. 'Hardware' refers to tools and equipment, 'Environment' is the physical and organizational setting, and 'Liveware' refers to the human element.

Question 77: A 'continuous-loop' fire detector (such as Kidde or Fenwal) works by:

Detecting infrared signatures of flames using a photoelectric cell
Sensing a change in electrical resistance or capacitance along a sensing element due to heat (Correct answer)
Sampling nacelle air every few seconds
Measuring CO2 levels in the nacelle atmosphere

Correct answer: Sensing a change in electrical resistance or capacitance along a sensing element due to heat

Continuous-loop systems use a sensing element that changes its electrical properties when heated, allowing fire detection anywhere along the loop's length.

Question 78: What is the role of the International Civil Aviation Organization (ICAO)?

It regulates airport security procedures.
It monitors airline profits.
It sets international safety and operational standards (Correct answer)
It controls the pricing of airline tickets.

Correct answer: It sets international safety and operational standards

The International Civil Aviation Organization (ICAO) plays a vital role in global aviation by setting international safety and operational standards. As a specialized agency of the United Nations, ICAO develops international Standards and Recommended Practices (SARPs) that member states adopt into their national aviation regulations. This harmonization of standards ensures a consistent level of safety and efficiency across international air travel.

Question 79: What does the designation 'AVGAS 100LL' mean?

Aviation gasoline approved for 100-hour inspection intervals
Aviation gasoline meeting 100 kPa pressure specification
Aviation gasoline with 100 octane rating and low lead content (Correct answer)
Aviation gasoline for use below 10,000 feet only

Correct answer: Aviation gasoline with 100 octane rating and low lead content

AVGAS 100LL stands for aviation gasoline with a 100 octane rating and 'low lead' formulation, containing less tetraethyl lead than the older 100/130 grade.

Question 80: What is the primary purpose of the aircraft's hydraulic system?

To manage the aircraft's electrical systems.
To monitor the aircraft's fuel levels.
To control the aircraft's engine performance.
To provide power for critical flight functions such as landing gear and brakes (Correct answer)

Correct answer: To provide power for critical flight functions such as landing gear and brakes

The aircraft's hydraulic system is crucial for operating heavy-duty components that require significant force. It uses pressurized fluid to power critical flight functions, such as extending and retracting the landing gear, operating the brakes, and moving flight control surfaces. This system ensures reliable and powerful actuation for essential aircraft operations.

Question 81: Why is it essential to test the system after making a repair?

To check the cosmetic appearance.
To monitor the fuel efficiency.
To prolong the repair process.
To confirm the repair was successful and the system operates as intended (Correct answer)

Correct answer: To confirm the repair was successful and the system operates as intended

Testing the system after a repair is a critical step in aircraft maintenance to verify the effectiveness of the work performed. This post-repair testing ensures that the fault has been fully resolved and that the system is functioning correctly and safely according to its operational specifications. It prevents the aircraft from returning to service with lingering issues, thereby safeguarding flight safety and reliability.

Question 82: During a maintenance task, an AME needs to safety wire a series of three bolts on an engine accessory case. What is the correct procedure for installing the safety wire?

A single wire should be used, passing through each bolt head and twisted only at the end.
No more than two bolts should ever be secured with a single piece of safety wire.
The wire should be routed in a way that the tension on the wire counteracts the tendency of the bolt to loosen. (Correct answer)
The wire should be installed so that it pulls the bolt head in the loosening direction.

Correct answer: The wire should be routed in a way that the tension on the wire counteracts the tendency of the bolt to loosen.

The fundamental principle of safety wiring is to install the wire in such a manner that it creates a tightening force on the fastener if it starts to loosen. This is often referred to as wiring 'righty-tighty'. While a common rule of thumb is to safety no more than three bolts together, the most critical aspect is the direction of pull.

Question 83: A pilot reports an intermittent 'red X' over the airspeed tape on their Primary Flight Display (PFD). From a maintenance perspective, which system is the most likely source of this failure?

The Air Data Computer (ADC) (Correct answer)
The display unit's internal symbol generator
The Attitude and Heading Reference System (AHRS)
The Flight Management System (FMS)

Correct answer: The Air Data Computer (ADC)

A 'red X' over a specific parameter like airspeed on an EFIS display indicates that the data is invalid or not being received. The Air Data Computer (ADC) is responsible for calculating airspeed, altitude, and vertical speed from pitot and static pressure inputs. A failure or data corruption from the ADC would cause the PFD to flag the related parameters as invalid.

Question 84: A castellated nut has been torqued to the minimum specified value, but the cotter pin hole does not align with any of the slots. According to standard maintenance practices, what is the correct procedure?

Replace the washer with a thinner one and re-torque.
Loosen the nut to the previous slot to align the hole.
Tighten the nut slightly to align with the next available slot, without exceeding the maximum torque value. (Correct answer)
Drill a new cotter pin hole in the bolt.

Correct answer: Tighten the nut slightly to align with the next available slot, without exceeding the maximum torque value.

Standard practice dictates that after reaching the minimum torque value, you may tighten the nut further to align the cotter pin hole with the next slot, as long as the maximum specified torque is not exceeded. Loosening the nut would result in it being under-torqued.

Question 85: An AME is inspecting a composite control surface and finds a defect where the layers of the laminate have separated. What is this type of damage called?

Porosity
Delamination (Correct answer)
Microcracking
Debonding

Correct answer: Delamination

Delamination is the specific term for the separation of layers or plies within a laminated composite material. Debonding refers to the failure of an adhesive joint between two separate components, such as the skin and a stiffener.

Question 86: Why must Jet-A fuel contain a static dissipater additive (SDA) during refueling operations?

Jet-A is naturally conductive and does not accumulate static charge
Jet-A is a poor electrical conductor and SDAs allow static charge to dissipate safely, reducing ignition risk (Correct answer)
Jet-A must be bonded to ground but requires no chemical additives
Jet-A has no static concern and SDAs are optional

Correct answer: Jet-A is a poor electrical conductor and SDAs allow static charge to dissipate safely, reducing ignition risk

Jet-A is a poor electrical conductor; static dissipater additives ensure accumulated static charge dissipates safely, reducing the risk of electrostatic ignition during fueling.

Question 87: An AME is tasked with replacing a component in the aircraft's high-pressure pneumatic system. Before loosening any fittings on the component, what is the most critical safety step that must be performed?

Ensure the aircraft's electrical and hydraulic systems are depowered.
Don appropriate personal protective equipment (PPE).
Verify the component's part number matches the maintenance manual.
Confirm that the specific pneumatic system has been fully depressurized by checking the pressure gauge. (Correct answer)

Correct answer: Confirm that the specific pneumatic system has been fully depressurized by checking the pressure gauge.

High-pressure pneumatic systems store a tremendous amount of energy. Attempting to disconnect a fitting before fully bleeding off the pressure can result in an explosive release of gas, turning components into dangerous projectiles. Verifying a zero-pressure reading on the system gauge is the most critical safety action to prevent serious injury.

Question 88: In a typical large transport aircraft, which component is primarily responsible for regulating the pressure and temperature of engine bleed air before it is distributed to various pneumatic systems?

The Pressure Regulating and Shutoff Valve (PRSOV). (Correct answer)
The APU load compressor.
The cabin outflow valve.
The pneumatic system check valve.

Correct answer: The Pressure Regulating and Shutoff Valve (PRSOV).

The Pressure Regulating and Shutoff Valve (PRSOV), often called a Bleed Air Valve, is the primary component that modulates the flow of hot, high-pressure air from the engine's compressor section. It regulates the downstream pressure and often incorporates a heat exchanger or precooler to reduce the air to a usable temperature for systems like air conditioning and wing anti-ice.

Question 89: An AME is feeling rushed to complete a task before the end of their shift to avoid delaying a flight. This feeling is a classic example of which of the 'Dirty Dozen' in human factors?

Fatigue
Lack of Communication
Complacency
Pressure (Correct answer)

Correct answer: Pressure

The scenario describes feeling rushed due to a deadline, which is a textbook example of the human factor 'Pressure.' Pressure can be internal (self-induced) or external (from the organization) and often leads to cutting corners or making mistakes. The other options are also part of the Dirty Dozen but do not fit the scenario as well.

Question 90: Which of the following tasks is considered 'Elementary Work' under the CARs and may be performed by a person who is not an AME, provided they are properly trained and authorized by the air operator?

Replenishing the hydraulic fluid. (Correct answer)
Performing a major modification to the avionics system.
Repairing a crack in the engine cowling.
Replacing a main landing gear tire on a Boeing 737.

Correct answer: Replenishing the hydraulic fluid.

Elementary work, as defined in CARs, includes tasks like replenishing fluids (oil, hydraulic fluid). These tasks are not subject to a maintenance release and can be performed by trained individuals other than AMEs, such as pilots or other authorized personnel, under an air operator's approved system. The other options are complex tasks requiring a licensed AME.

Question 91: On a hydraulically actuated variable-pitch propeller, what fluid is typically used as the actuating medium?

MIL-H-5606 hydraulic fluid
Skydrol hydraulic fluid
Engine oil (Correct answer)
Water-glycol mixture

Correct answer: Engine oil

Most variable-pitch propeller systems use engine oil as the actuating fluid because it is readily available and provides the required pressure.

Question 92: What is the role of the aircraft's environmental control system?

To control engine temperature.
To provide oxygen to passengers in case of an emergency.
To monitor fuel efficiency.
To regulate temperature, pressure, and air quality in the cabin (Correct answer)

Correct answer: To regulate temperature, pressure, and air quality in the cabin

The aircraft's environmental control system (ECS) is designed to maintain a safe and comfortable cabin environment for passengers and crew. It actively regulates the cabin's temperature, pressure, and air quality, especially at high altitudes where outside conditions are extreme. This system is essential for preventing hypoxia and ensuring passenger well-being throughout the flight.

Question 93: An AME is performing a functional test of a TCAS II system. The test set simulates a conflict that generates a 'Climb, Climb' aural alert and a corresponding visual command on the PFD. What type of advisory has been generated?

Traffic Advisory (TA)
System Test Advisory (STA)
Resolution Advisory (RA) (Correct answer)
Proximity Advisory (PA)

Correct answer: Resolution Advisory (RA)

TCAS II provides two levels of alerts. A Traffic Advisory (TA) simply alerts the crew to the presence of nearby traffic. A Resolution Advisory (RA) is a command that instructs the pilot to perform a specific vertical maneuver, such as 'Climb' or 'Descend', to avoid a collision.

Question 94: What type of lubrication system is standard on most horizontally-opposed aircraft reciprocating engines?

Total loss oiling using pre-mixed fuel and oil
Wet sump with oil stored in the engine crankcase (Correct answer)
Dry sump with a remote external oil tank
External hydraulic oil shared with the flight controls

Correct answer: Wet sump with oil stored in the engine crankcase

Most horizontally-opposed aircraft engines use a wet sump system where oil is stored in the engine crankcase sump and circulated by an engine-driven gear pump.

Question 95: An aircraft's turboprop engine utilizes its gas turbine core primarily to do what?

Drive a propeller through a reduction gearbox. (Correct answer)
Heat the air for a ramjet effect at high speeds.
Generate the majority of its thrust from the high-velocity exhaust gases.
Drive a large fan for high-bypass airflow.

Correct answer: Drive a propeller through a reduction gearbox.

In a turboprop engine, the vast majority of the energy produced by the gas turbine section is used to drive a propeller via a reduction gearbox. The propeller then accelerates a large mass of air, generating most of the engine's thrust. A small amount of thrust is produced by the exhaust gases.

Question 96: What role does aircraft documentation play in troubleshooting?

It reduces the time required for repairs.
It prevents the need for additional inspections.
It provides historical context and guidance for troubleshooting (Correct answer)
It focuses on cosmetic repairs.

Correct answer: It provides historical context and guidance for troubleshooting

Aircraft documentation, including maintenance manuals, service bulletins, wiring diagrams, and previous repair records, is invaluable for troubleshooting. It offers a comprehensive historical context of the aircraft's systems and past issues, helping technicians understand potential failure points or recurring problems. This detailed guidance allows for more efficient and accurate diagnosis, ensuring repairs are performed correctly and in compliance with established procedures.

Question 97: During a shift handover, an AME verbally tells the incoming AME that the torque checks on the main landing gear are 'all done.' However, they fail to mention that one bolt could not be accessed and was not torqued. This omission is a critical failure of which human factor from the 'Dirty Dozen'?

Lack of Teamwork
Lack of Assertiveness
Lack of Communication (Correct answer)
Norms

Correct answer: Lack of Communication

This scenario is a classic example of a 'Lack of Communication.' The outgoing AME failed to convey complete and critical information to the incoming shift, creating a high-risk situation. Effective shift handovers require the clear and thorough exchange of all task-relevant information.

Question 98: In a semi-monocoque fuselage, what is the primary function of stringers?

To provide the main longitudinal strength and absorb bending loads.
To serve as the primary attachment points for the wings and empennage.
To give the fuselage its cross-sectional shape and support concentrated loads.
To transfer skin stress to the formers and prevent buckling of the skin. (Correct answer)

Correct answer: To transfer skin stress to the formers and prevent buckling of the skin.

Stringers are longitudinal members that run the length of the fuselage. Their main purpose is to stiffen the skin and prevent it from buckling under compression and shear loads. They also transfer the stresses from the skin to the transverse frames (formers).

Question 99: Why is it important to have certified technicians for aircraft maintenance?

To ensure safe and effective maintenance according to regulatory standards (Correct answer)
To improve fuel efficiency.
To reduce the number of inspections.
To increase the complexity of maintenance.

Correct answer: To ensure safe and effective maintenance according to regulatory standards

It is crucial to have certified technicians for aircraft maintenance because they possess the specialized knowledge, skills, and training required to perform complex tasks safely and effectively. Certification ensures that technicians adhere to strict regulatory standards and best practices, which is vital for maintaining the airworthiness and safety of aircraft. Their expertise directly contributes to preventing accidents and ensuring reliable operations.

Question 100: Which component of the aircraft's fuel system ensures consistent fuel delivery?

The fuel filter.
The fuel pump (Correct answer)
The fuel gauge.
The fuel tank.

Correct answer: The fuel pump

The fuel pump is a vital component in an aircraft's fuel system, responsible for drawing fuel from the tanks and delivering it under pressure to the engines. This consistent fuel delivery is essential for engine operation, ensuring a steady and reliable supply regardless of flight attitude or altitude. Without a functioning fuel pump, engines would not receive the necessary fuel to operate.

Aircraft Maintenance Engineer (AME) License Exams

The AME License Exams certify individuals to inspect, maintain, and repair aircraft, ensuring airworthiness and safety.

100

Questions

120 min

Time Limit

70%

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