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FAA Aviation Maintenance Technician Powerplant Knowledge Test Practice Test

The FAA Aviation Maintenance Technician Powerplant Knowledge Test (AMP) concerns aircraft engine systems and the principles behind their operation. Practice-bank questions touch on reciprocating-engine cooling and ignition, fuel metering, turbine combustion, propeller reduction gearing, exhaust-gas temperature, and engine oil-pressure indication. These topics connect component purpose with the operating effects a technician needs to recognize when inspecting or troubleshooting powerplant systems.

Exam overview

Exam providerFederal Aviation Administration
Exam codeAMP
CategoryAviation

About the FAA Aviation Maintenance Technician Powerplant Knowledge Test Exam

Powerplant knowledge involves tracing how fuel and air enter an engine, how combustion produces usable output, and how components control heat, lubrication, and rotation. For reciprocating engines, technicians need to distinguish four-stroke valve events, understand magneto ignition, and relate cylinder baffling and cooling fins to heat removal. Carburetor float operation is tied to maintaining fuel level for metering. Turbine-engine concepts include the combustion chamber’s role in the gas path, while propeller reduction gearing matches engine speed to propeller operation. Instrument interpretation also matters: EGT and oil-pressure indications provide different information about engine condition. These relationships support maintenance decisions such as identifying a likely system area for inspection, understanding what a component is intended to do, and interpreting operating indications without confusing measurement with cause. The practice-bank examples span both piston and turbine powerplants rather than a single engine type.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

Why is engine baffling installed around the cylinders of many air-cooled reciprocating engines?

  1. ATo guide cooling airflow over the cylinder surfaces
  2. BTo prevent the crankshaft from transmitting torque to the propeller
  3. CTo increase fuel vaporization in the intake manifold
  4. DTo route ignition current away from the spark plugs
Show answerCorrect answer: A

Baffles direct cooling air through intended paths around the cylinders rather than allowing it to bypass them. Correct installation and condition are important for effective cooling.

Question 2

What does an engine exhaust gas temperature (EGT) indication represent?

  1. AThe temperature of exhaust gas at the location of the sensing probe
  2. BThe temperature of the engine oil returning to the sump
  3. CThe pressure of air entering the compressor
  4. DThe temperature of fuel inside the fuel-control unit
Show answerCorrect answer: A

An EGT system senses exhaust-gas temperature at one or more probe locations. The indicated value is tied to that measurement location and is not necessarily the gas temperature throughout the exhaust system.

Question 3

What is the primary function of a float-type carburetor float?

  1. ATo regulate fuel level in the float chamber
  2. BTo atomize fuel at the discharge nozzle
  3. CTo control ignition timing
  4. DTo increase intake-manifold pressure
Show answerCorrect answer: A

The float rises and falls with fuel level and operates the inlet valve to maintain an appropriate fuel level in the float chamber.

Question 4

What is the primary function of a propeller blade's leading edge?

  1. ATo meet the incoming airflow at the front edge of the blade section
  2. BTo attach the propeller hub directly to the engine mount
  3. CTo seal the engine's combustion chambers
  4. DTo transfer oil from the sump to the rocker arms
Show answerCorrect answer: A

The leading edge is the forward edge of the blade section as it moves through the air. Its shape influences the blade's aerodynamic behavior and is inspected for damage such as nicks and erosion.

Question 5

What is the main purpose of a reduction gear between a turbine engine and its propeller?

  1. ATo increase propeller speed above turbine speed
  2. BTo reduce propeller speed while transmitting power
  3. CTo prevent compressor stall
  4. DTo meter fuel to the combustion section
Show answerCorrect answer: B

A reduction gear allows the turbine to operate at high speed while turning the propeller at a lower speed suitable for efficient propeller operation.

Question 6

What is the general purpose of an engine cooling fin on an air-cooled cylinder?

  1. ATo increase surface area for heat transfer to the cooling air
  2. BTo direct fuel into the combustion chamber
  3. CTo reduce the cylinder's compression ratio
  4. DTo support the crankshaft bearings
Show answerCorrect answer: A

Cooling fins increase the cylinder's exposed surface area, allowing heat to transfer more effectively from the engine to the surrounding airflow.

Question 7

What is the purpose of a magneto in a typical piston-engine ignition system?

  1. ATo supply electrical energy for the spark plugs independently of the aircraft battery
  2. BTo regulate alternator output voltage
  3. CTo circulate oil through the engine
  4. DTo control the fuel-air ratio in cruise
Show answerCorrect answer: A

A magneto generates the high-voltage electrical energy needed for ignition and operates independently of the aircraft's battery and electrical system.

How to use this practice test

The free US Practice Tests practice session draws up to 20 random questions from its published 50-question AMP bank. Answer each item by identifying the component’s function or the engine process involved; after the session, use the results to locate concepts that need another pass, such as ignition, cooling, fuel metering, or instrument indications.

Preparation tips

  • Sketch the four strokes of a reciprocating engine and mark when the intake and exhaust valves normally open or close.
  • Compare magneto ignition with carburetor fuel metering by stating what each system controls and how it contributes to engine operation.
  • Trace the turbine gas path through the combustion chamber, then explain how reduction gearing changes the speed relationship between a turbine engine and its propeller.
  • For EGT and oil-pressure indications, write down what each instrument measures and avoid treating an indication as a diagnosis by itself.
  • Review how cylinder baffling and cooling fins guide heat transfer on air-cooled engines, and connect each feature to its location and function.
Official sourceOfficial exam page ↗