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Engine Inspection: Powerplant practice questions

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

1. When should a differential compression test be done?
  1. As soon as possible after engine shutdown
  2. After the engine has cooled overnight
  3. Only during a cold start
Show answer

A. As soon as possible after engine shutdown A warm engine gives uniform lubrication of the cylinder walls and rings.

Reference: FAA-H-8083-32B, Ch. 10, p. 10-39

2. During a differential compression test, what pressure is the tester regulator typically adjusted to?
  1. 20 psi
  2. 80 psi
  3. 150 psi
Show answer

B. 80 psi The regulated pressure is set to 80 psi before air is applied to the cylinder.

Reference: FAA-H-8083-32B, Ch. 10, p. 10-40

3. Where must the piston be when air pressure is applied for a differential compression test?
  1. At top center of the compression stroke
  2. At bottom center of the intake stroke
  3. At any position
Show answer

A. At top center of the compression stroke With both valves closed, leakage reflects the rings and valves.

Reference: FAA-H-8083-32B, Ch. 10, p. 10-39

4. During a hot-section inspection, what should the first-stage turbine blades and nozzle guide vanes be checked for?
  1. Cracks, warping or FOD
  2. Oil-film thickness
  3. Paint condition only
Show answer

A. Cracks, warping or FOD The combustion outlet ducts and turbine nozzle are also checked for cracks and FOD.

Reference: FAA-H-8083-32B, Ch. 10, p. 10-47

5. Which of these is listed in the handbook as a powerplant instrument?
  1. Cylinder head temperature gauge
  2. Airspeed indicator
  3. Turn coordinator
Show answer

A. Cylinder head temperature gauge The list also includes oil pressure, oil temperature, tachometer, EGT and torquemeter.

Reference: FAA-H-8083-32B, Ch. 10, p. 10-21

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What does the Powerplant test cover on engine inspection?

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