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APUs & Turbine-Engine Accessories: Powerplant practice questions

Five original questions on apus & turbine-engine accessories, each with the answer, an explanation and an FAA-H-8083-32B page reference.

1. What does an APU provide on a turbine-powered aircraft?
  1. Electrical power and bleed air on the ground, and a backup generator in flight
  2. Primary thrust
  3. Hydraulic fluid storage
Show answer

A. Electrical power and bleed air on the ground, and a backup generator in flight An APU is a turboshaft engine.

Reference: FAA-H-8083-32B, Ch. 1, p. 1-37

2. Which is a listed use of bleed air?
  1. Pneumatic starting of engines
  2. Oil cooling of the APU
  3. Fuel metering
Show answer

A. Pneumatic starting of engines Other uses include pressurization and anti-icing.

Reference: FAA-H-8083-32B, Ch. 1, p. 1-38

3. Where does an APU get its fuel?
  1. From the aircraft fuel system, sometimes with an electric boost pump
  2. From its own sealed tank
  3. From the oil system
Show answer

A. From the aircraft fuel system, sometimes with an electric boost pump FADEC is used on APUs as well.

Reference: FAA-H-8083-32B, Ch. 2, p. 2-36

4. What is part of normal air turbine starter maintenance?
  1. Check oil level and inspect the magnetic chip detector
  2. Replace the turbine each flight
  3. Adjust ignition timing
Show answer

A. Check oil level and inspect the magnetic chip detector Also check for leaks.

Reference: FAA-H-8083-32B, Ch. 5, p. 5-13

5. When a turbine engine is running, what supplies power to the EEC directly?
  1. The permanent magnet alternator (PMA)
  2. The APU battery only
  3. The starter
Show answer

A. The permanent magnet alternator (PMA) Otherwise the aircraft electrical system powers it.

Reference: FAA-H-8083-32B, Ch. 2, p. 2-38

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What does the Powerplant test cover on apus & turbine-engine accessories?

The Aviation Mechanic Powerplant ACS lists apus & turbine-engine accessories as one of its areas. The FAA reference for this material is FAA-H-8083-32B.