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

Question 1: 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
Pressure (Correct answer)
Lack of Communication
Complacency

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 2: What is the typical repair method for minor nicks and gouges on aluminum propeller blade leading edges?

Applying epoxy filler to restore the original contour
Welding or brazing the damaged area
Filing the nick smooth and blending it into the blade profile (Correct answer)
Replacing the blade immediately regardless of size

Correct answer: Filing the nick smooth and blending it into the blade profile

Minor nicks on aluminum propeller blades are repaired by carefully filing them smooth and blending the edges to prevent stress concentration and fatigue cracking.

Question 3: What is the function of the aircraft's emergency systems in compliance with safety regulations?

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

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 4: What is the function of an aircraft troubleshooting checklist?

To increase the complexity of the repair.
To track the number of flight hours.
To monitor fuel efficiency.
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 5: What is the purpose of a fuel jettison (fuel dump) system on large transport aircraft?

To rapidly reduce aircraft weight to maximum landing weight in an emergency (Correct answer)
To remove contaminated fuel from tanks before landing
To transfer fuel to a reserve tank in case of engine failure
To balance fuel load between wings during asymmetric flight

Correct answer: To rapidly reduce aircraft weight to maximum landing weight in an emergency

Fuel jettison systems allow aircraft to rapidly dump fuel overboard to reduce gross weight to the maximum allowable landing weight when an emergency landing is required shortly after takeoff.

Question 6: What is the function of the aircraft's electrical system?

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

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

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

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 8: In a turbine engine fuel system, what is the function of a fuel-oil heat exchanger?

To heat engine oil during cold weather starts using fuel as the heat source
To separate water from the fuel using temperature differential
To cool the fuel before it enters the combustion chamber
To simultaneously warm the fuel to prevent wax crystallization and cool the engine oil (Correct answer)

Correct answer: To simultaneously warm the fuel to prevent wax crystallization and cool the engine oil

The fuel-oil heat exchanger heats jet fuel to prevent wax crystal formation at altitude while simultaneously cooling engine oil, accomplishing both tasks in a single unit.

Question 9: An aircraft's turboprop engine utilizes its gas turbine core primarily to do what?

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

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 10: 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)
Repairing a crack in the engine cowling.
Performing a major modification to the avionics system.
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 11: Centrifugal twisting moments (CTM) acting on propeller blades tend to:

Cause blades to feather automatically
Hold blades in a fixed position
Move blades toward high pitch (coarse)
Move blades toward low pitch (fine) (Correct answer)

Correct answer: Move blades toward low pitch (fine)

Centrifugal twisting moments act to flatten the blade toward low pitch because centrifugal force tends to rotate the blade chord into the plane of rotation.

Question 12: 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?

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

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 13: Why are aircraft maintenance records important for regulatory compliance?

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

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

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

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 15: 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.
Ensure a metal-to-metal contact for proper electrical bonding.
Use aluminum rivets to attach the steel fitting.
Isolate the dissimilar metals with a suitable non-conductive barrier or sealant. (Correct answer)

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

To assess flight crew performance.
To track passenger complaints.
To monitor aircraft fuel consumption.
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 17: Why is regular inspection of aircraft structures important?

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

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

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

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 19: 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 failure of the EICAS display unit itself.
A warning requiring immediate and urgent crew action.

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

Skydrol hydraulic fluid
Engine oil (Correct answer)
MIL-H-5606 hydraulic fluid
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 21: 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'?

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

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 22: 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 hydraulic fluid is contaminated with water.
The system relief valve is stuck in the open position.
The system filter is completely clogged.

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 23: What is the primary safety advantage of a dual independent magneto ignition system in a reciprocating aircraft engine?

It eliminates the need for battery power during flight
It provides redundancy so the engine continues running if one magneto fails (Correct answer)
It automatically adjusts ignition timing with altitude changes
It doubles the engine's rated power output

Correct answer: It provides redundancy so the engine continues running if one magneto fails

Dual magnetos are self-contained and independent of each other, so a failure of one magneto in flight does not stop the engine since the other continues to provide ignition.

Question 24: What is the significance of air traffic control (ATC) regulations?

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

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 25: 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?

Add sulfuric acid to the low cell to equalize the specific gravity.
Top off the low cell with distilled water and return to service.
Replace the battery as it is likely nearing the end of its service life. (Correct answer)
Charge the battery and re-check 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 26: What is the role of the aircraft's environmental control system?

To monitor fuel efficiency.
To control engine temperature.
To provide oxygen to passengers in case of an emergency.
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 27: What is the primary purpose of the aircraft's hydraulic system?

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

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 28: What is 'propeller slip'?

Blade flex under high power settings
Loss of traction during ground operations on wet surfaces
Movement of the propeller hub on the engine shaft
The difference between geometric pitch and effective pitch (Correct answer)

Correct answer: The difference between geometric pitch and effective pitch

Propeller slip is the difference between the theoretical geometric pitch and the actual effective pitch, representing the propeller's inefficiency due to airflow interaction.

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

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

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: 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 blades freeze in their current position
The propeller immediately overspeeds

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 31: 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?

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

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

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

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 33: At what point in the 4-stroke operating cycle does ignition typically occur?

At the midpoint of the power stroke
At the beginning of the intake stroke
Near the end of the compression stroke slightly before TDC (Correct answer)
At the start of the exhaust stroke

Correct answer: Near the end of the compression stroke slightly before TDC

Ignition is timed to occur slightly before TDC on the compression stroke so that maximum combustion pressure develops just after TDC for optimal power output.

Question 34: 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 35: What does a differential compression test measure on a reciprocating engine cylinder?

The pressure differential between fuel injection and induction air at the injector nozzle
The engine's overall power output at a standardized RPM setting
The leakage of compressed air past piston rings and valves to assess internal cylinder condition (Correct answer)
The ratio of intake-to-exhaust gas pressures during normal operation

Correct answer: The leakage of compressed air past piston rings and valves to assess internal cylinder condition

A differential compression test applies regulated air pressure to the cylinder and measures leakage with a differential gauge; the location of escaping air (exhaust, intake, or crankcase) identifies the defective component.

Question 36: Which system is responsible for the aircraft's landing gear operation?

The hydraulic system (Correct answer)
The avionics system.
The fuel system.
The environmental control 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 37: What type of bearing is used for crankshaft main and connecting rod journals in most aircraft reciprocating engines?

Tapered roller bearings
Deep-groove ball bearings
Needle roller cage bearings
Precision plain (sleeve) insert bearings (Correct answer)

Correct answer: Precision plain (sleeve) insert bearings

Precision plain insert bearings (split bearing shells) handle high dynamic loads, are easily replaced at overhaul, and rely on a pressurized hydrodynamic oil film for lubrication.

Question 38: Which component in a fuel system prevents fuel from flowing backward from the engine toward the tanks?

Fuel selector valve
Firewall shutoff valve
Fuel strainer
Check valve (Correct answer)

Correct answer: Check valve

Check valves are one-way valves that allow fuel flow in only one direction, preventing reverse flow that could drain lines or allow unintended fuel migration between tanks.

Question 39: What is the primary objective of an engine break-in procedure after overhaul or cylinder replacement?

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 flush manufacturing residue and metal particles from the oil system
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 40: Which of the following describes the primary function of the turbine section in a gas turbine engine?

To decrease the velocity of the exhaust gases to prevent structural damage.
To increase the pressure of the air entering the combustion chamber.
To mix fuel with compressed air and ignite the mixture.
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 41: Why are aircraft materials chosen for their strength-to-weight ratio?

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

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 42: What is the primary goal of aviation safety regulations?

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

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

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

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.
To increase the aircraft's speed.

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

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

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 46: 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?

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

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 47: How does preventive maintenance help in troubleshooting?

By reducing the number of technicians.
By reducing the number of inspections.
By addressing issues early and preventing breakdowns (Correct answer)
By delaying necessary repairs.

Correct answer: By addressing issues early and preventing breakdowns

Preventive maintenance involves scheduled inspections, servicing, and replacement of components before they fail. By proactively identifying and addressing minor issues or worn parts, preventive maintenance significantly reduces the likelihood of unexpected breakdowns and major system failures. This approach minimizes the need for reactive troubleshooting, enhances aircraft reliability, and ultimately contributes to safer and more efficient operations.

Question 48: 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?

Filiform corrosion
Surface corrosion (Correct answer)
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 49: What does a sudden, significant drop in oil pressure during flight most likely indicate?

Normal pressure variation during a power reduction
The need to add oil at the next scheduled maintenance stop
The engine has reached its normal operating temperature
A serious oil system malfunction such as a major leak or bearing failure requiring immediate action (Correct answer)

Correct answer: A serious oil system malfunction such as a major leak or bearing failure requiring immediate action

A sudden oil pressure drop can indicate catastrophic oil loss, pump failure, or bearing failure — any of which can cause rapid engine destruction and require immediate emergency action.

Question 50: 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?

Ultrasonic Inspection (Correct answer)
Eddy Current Inspection
Visual Inspection with a magnifying glass
Dye Penetrant 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 51: What type of fire extinguishing agent is most commonly used in aircraft engine nacelle fire suppression systems?

Halon 1301 or approved replacements such as HFC-227ea (Correct answer)
Carbon dioxide (CO2)
Water mist
Dry chemical powder

Correct answer: Halon 1301 or approved replacements such as HFC-227ea

Halon 1301 and its approved replacements are standard for aircraft engine fire suppression due to their effectiveness, low toxicity, and minimal residue.

Question 52: 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?

Microcracking
Debonding
Delamination (Correct answer)
Porosity

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

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

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

Software (Correct answer)
Hardware
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 55: 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 wire's flexibility rating.
The wire's cross-sectional area. (Correct answer)
The brand of the wire manufacturer.
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 56: 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 transfer skin stress to the formers and prevent buckling of the skin. (Correct answer)
To give the fuselage its cross-sectional shape and support concentrated loads.

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 57: An aircraft fuel vent system primarily prevents:

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

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 58: 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.
At least 50% of the number of fuses of each required rating. (Correct answer)
At least 25% of the number of fuses of each required rating.
One spare for each essential fuse.

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

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

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 60: 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 reduce the number of inspections.
To improve the aesthetic appearance of the aircraft.
To make the repair process quicker.

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

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

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 62: 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?

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

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

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

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

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

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 65: 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 etch the surface of the material to open up small cracks.
To remove excess penetrant from the surface after the dwell time.

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

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

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

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 68: What does BMEP (Brake Mean Effective Pressure) represent in engine performance analysis?

The peak cylinder pressure measured during the power stroke
The pressure differential between intake manifold and exhaust back-pressure
An average effective pressure that would produce the measured brake torque throughout the full stroke (Correct answer)
The minimum oil pressure required at maximum rated power output

Correct answer: An average effective pressure that would produce the measured brake torque throughout the full stroke

BMEP is a calculated mean pressure that, if acting constantly throughout the entire power stroke, would produce the same torque measured at the crankshaft, enabling comparison across engines of different displacements.

Question 69: What is the role of the International Civil Aviation Organization (ICAO)?

It sets international safety and operational standards (Correct answer)
It regulates airport security procedures.
It monitors airline profits.
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 70: 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 has no static concern and SDAs are optional
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

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 71: 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?

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

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

The blade tip moves faster than the root, requiring a lower angle at the tip for uniform efficiency (Correct answer)
Aerodynamic forces twist the blade during high-power operation
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 73: Why is it essential to test the system after making a repair?

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

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 74: What is the correct firing order of the Lycoming O-320 four-cylinder horizontally-opposed aircraft engine?

1-4-2-3
1-2-4-3
1-3-2-4 (Correct answer)
1-3-4-2

Correct answer: 1-3-2-4

The Lycoming O-320 uses a 1-3-2-4 firing order to evenly distribute power strokes across the crankshaft and minimize vibration.

Question 75: 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 76: 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?

18 months
6 months (Correct answer)
12 months
3 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 77: 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?

Pitting Corrosion
Intergranular Corrosion (Correct answer)
Surface Corrosion
Filiform 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 78: 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?

No more than two bolts should ever be secured with a single piece of safety wire.
A single wire should be used, passing through each bolt head and twisted only at the end.
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 79: Which component of the aircraft's fuel system ensures consistent fuel delivery?

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

Question 80: 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 cabin outflow valve.
The APU load compressor.
The Pressure Regulating and Shutoff Valve (PRSOV). (Correct answer)
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 81: What does a low manifold absolute pressure (MAP) reading at full throttle indicate on a normally aspirated reciprocating engine?

High outside air temperature reducing induction air density
Normal operation at cruise altitude
Excessive fuel enrichment causing back-pressure
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 82: Why is pilot training compliance crucial to aviation safety?

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.
To reduce flight time.

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 83: 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 measure fuel quantity electronically
To transfer fuel between tanks for lateral balance only
To filter contaminants from fuel before engine delivery

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 84: 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 429 (Correct answer)
MIL-STD-1553
CAN bus
ARINC 664 (AFDX)

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 85: 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)
18 years
There is no minimum age, only an experience requirement.
25 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 86: What is the importance of torqueing in aircraft maintenance?

To reduce the fuel consumption of the aircraft.
To monitor engine performance.
To ensure fasteners are securely tightened to prevent safety hazards (Correct answer)
To measure the weight of the aircraft.

Correct answer: To ensure fasteners are securely tightened to prevent safety hazards

Torqueing is of paramount importance in aircraft maintenance to ensure that fasteners, such as bolts and nuts, are securely tightened to their precise specifications. Improper torque can lead to loose components, structural fatigue, or even catastrophic failure, creating significant safety hazards. Correct torqueing ensures the structural integrity and reliability of the aircraft.

Question 87: How does preignition differ from detonation in a reciprocating engine?

Preignition occurs after TDC while detonation always occurs before TDC
Preignition is harmless at normal power while detonation causes immediate structural damage
Preignition is ignition before the spark plug fires; detonation is explosive auto-ignition of the end charge after normal ignition (Correct answer)
Preignition and detonation are interchangeable terms for the same abnormal combustion event

Correct answer: Preignition is ignition before the spark plug fires; detonation is explosive auto-ignition of the end charge after normal ignition

Preignition is caused by hot carbon deposits or incandescent spots igniting the mixture before the spark plug fires, while detonation is the explosive auto-ignition of the unburned end charge after normal spark ignition has occurred.

Question 88: 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?

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

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 89: What is the function of an aircraft maintenance checklist?

To reduce the number of maintenance checks.
To monitor the aircraft's fuel efficiency.
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 90: What is the purpose of the aircraft's wing structure?

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

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

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 92: During an annual inspection of a fixed-pitch propeller, which condition requires blade replacement rather than repair?

Small nicks less than 1/8 inch deep on the leading edge
A crack of any length on the blade face (Correct answer)
Minor paint chipping on the blade tip
Slight surface scratches on the blade shank

Correct answer: A crack of any length on the blade face

Any crack in a propeller blade is cause for rejection because cracks propagate rapidly under cyclical loading and can lead to catastrophic blade separation.

Question 93: Which of the following describes a 'trip-free' circuit breaker?

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 requires a special tool to be reset.
A circuit breaker that cannot be manually reset until it has cooled down.
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 94: Propeller 'tracking' is a maintenance check that verifies:

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

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 95: The 'beta range' in turboprop propeller operation refers to:

Ground operation range where blade angle is directly controlled by the power lever (Correct answer)
Emergency feather position
Normal in-flight constant-speed operation
Reverse thrust range during landing rollout only

Correct answer: Ground operation range where blade angle is directly controlled by the power lever

The beta range is a ground operating mode where the pilot directly controls blade pitch through the power lever rather than through the governor, enabling ground maneuvering and reverse thrust.

Question 96: What is the primary purpose of cylinder cooling fins and baffles on an air-cooled reciprocating engine?

To dampen mechanical vibration during high-power operation
To reduce intake air turbulence for more uniform combustion
To direct airflow over cylinder surfaces and maximize heat dissipation to the passing air (Correct answer)
To reduce the overall installed weight of the engine

Correct answer: To direct airflow over cylinder surfaces and maximize heat dissipation to the passing air

Baffles channel ram air tightly around the cylinders while fins dramatically increase the heat-transfer surface area, together maximizing the rate at which combustion heat is removed.

Question 97: 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?

Ultrasonic Inspection (Correct answer)
Eddy Current Inspection
Magnetic Particle Inspection
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 98: What is the function of the power enrichment (economizer) circuit in an aircraft float carburetor?

To prevent fuel starvation during sustained inverted flight maneuvers
To automatically lean the mixture during steady cruise for fuel economy
To enrich the mixture at high power settings to prevent detonation and provide cylinder cooling (Correct answer)
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 99: 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?

Complacency (Correct answer)
Distraction
Lack of Knowledge
Stress

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 100: 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)
Rushing to complete the final tasks to finish the shift sooner.
Drinking a large coffee for a quick energy boost.
Increasing the hangar lighting to maximum brightness.

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).

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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