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Exhaust & Reverser Systems: Powerplant practice questions

Five original questions on exhaust & reverser systems, each with the answer, an explanation and an FAA-H-8083-32B page reference.

1. Besides power loss and fire, what serious hazard can an exhaust system failure cause?
  1. Carbon monoxide poisoning
  2. Vapor lock
  3. Magneto drop
Show answer

A. Carbon monoxide poisoning Any exhaust system failure should be treated as a severe hazard.

Reference: FAA-H-8083-32B, Ch. 3, p. 3-22

2. How does a clamshell (mechanical-blockage) thrust reverser work?
  1. It forms a barrier in the exhaust path that reverses thrust
  2. It reverses the turbine rotation
  3. It increases the fan speed
Show answer

A. It forms a barrier in the exhaust path that reverses thrust Cascade (aerodynamic) reversers are the other main type.

Reference: FAA-H-8083-32B, Ch. 3, p. 3-27

3. Besides CO, what can a failed heat exchanger surface cause?
  1. Exhaust drawn into the induction system, causing overheating and power loss
  2. Low oil pressure
  3. Propeller overspeed
Show answer

A. Exhaust drawn into the induction system, causing overheating and power loss Spot-weld failures can also leak exhaust gas.

Reference: FAA-H-8083-32B, Ch. 3, p. 3-24

4. What can internal muffler failures (baffles, diffusers) cause?
  1. Partial or complete engine power loss
  2. Higher fuel pressure
  3. Faster starts
Show answer

A. Partial or complete engine power loss Loose pieces can block exhaust flow.

Reference: FAA-H-8083-32B, Ch. 3, p. 3-24

5. What simple tool is useful for probing suspected weak areas of an exhaust system?
  1. An ice pick or similar pointed instrument
  2. A torque wrench
  3. A feeler gauge
Show answer

A. An ice pick or similar pointed instrument Internal baffles may also need disassembly for inspection.

Reference: FAA-H-8083-32B, Ch. 3, p. 3-23

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What does the Powerplant test cover on exhaust & reverser systems?

The Aviation Mechanic Powerplant ACS lists exhaust & reverser systems as one of its areas. The FAA reference for this material is FAA-H-8083-32B.