Powerplant Systems & Maintenance Flashcards
7 cards from real Airframe Mechanic Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Powerplant Systems & Maintenance flashcards as text
What is the function of a propeller governor?
Answer: Maintain a selected RPM by varying propeller pitch
The propeller governor maintains a pilot-selected RPM by increasing or decreasing blade pitch as engine power or airspeed changes.
Carburetor icing most commonly forms:
Answer: At temperatures between approximately -7°C and 21°C with high humidity
Carburetor ice can form at temperatures between -7°C and 21°C (20°F–70°F) when humidity is high due to fuel evaporation and venturi cooling effects.
An oil analysis report showing a sudden spike in iron particles most likely indicates:
Answer: Wear or damage in ferrous engine components such as cylinder walls or gears
Iron particles in oil analysis indicate wear or damage to ferrous metal engine components and warrant investigation before further flight.
What happens to mixture requirements as altitude increases in a non-turbocharged reciprocating engine?
Answer: Mixture must be leaned because air density decreases
As altitude increases, air density decreases so less air enters the engine, requiring the mixture to be leaned to maintain the proper fuel-air ratio.
A turbine engine's N1 speed refers to:
Answer: Low-pressure compressor (fan) and turbine spool speed
N1 represents the rotational speed of the low-pressure spool, which includes the fan (in turbofans) and associated low-pressure turbine stages.
When must a reciprocating engine be run on the ground before an oil change is due, according to best maintenance practice?
Answer: Warm the engine to operating temperature to suspend contaminants in the oil before draining
Warming the engine to operating temperature suspends contaminants and sludge in the oil so they drain out with the old oil rather than remaining in the engine.
Thrust reversers on turbine-powered aircraft are primarily used to:
Answer: Supplement braking on landing rollout
Thrust reversers redirect engine exhaust forward to provide deceleration assistance during landing rollout, reducing brake wear and stopping distance.