Powerplant Systems & Engine Maintenance Flashcards
7 cards from real AMT 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 & Engine Maintenance flashcards as text
What action should be taken if metal particles are found in the oil filter during an engine inspection?
Answer: Remove the engine from service for further investigation to identify the source of the contamination
Metal particles in the oil filter indicate internal wear or damage requiring removal of the engine from service and thorough investigation before further flight.
What is 'propeller torque effect' and how does it affect aircraft handling?
Answer: The tendency of the aircraft to roll opposite to propeller rotation due to Newton's third law reaction torque
Torque effect is the reaction to engine/propeller rotation per Newton's third law; on a clockwise-rotating (from the cockpit) propeller, the aircraft tends to roll left.
During an engine run-up, the RPM drop on the right magneto is within limits, but the left magneto shows an excessive RPM drop. The most likely cause is:
Answer: Left magneto timing is retarded, or there is a fouled plug or defective ignition lead in the left magneto circuit
An excessive drop on one magneto indicates a timing problem, fouled spark plug, or faulty ignition component associated with that magneto's circuit.
What is the significance of a 'hot start' in a turbine engine?
Answer: An engine start in which the exhaust gas temperature (EGT) exceeds the manufacturer's starting temperature limit
A hot start occurs when EGT exceeds limits during the start sequence, which can cause severe turbine damage and requires an engine inspection before further flight.
Which material is most commonly used for turbine engine combustion liner construction due to its high-temperature oxidation resistance?
Answer: Nickel-based superalloys or cobalt-based alloys
Nickel-based and cobalt-based superalloys are used for combustion liners because they retain mechanical properties and resist oxidation at the extreme temperatures in the combustor.
What is the purpose of the propeller governor's speeder spring?
Answer: To set the desired RPM by opposing the flyweight force; the pilot compresses the spring via the prop control to select higher RPM
The speeder spring in the governor establishes the set-point RPM by opposing the centrifugal flyweights; moving the prop control increases spring tension to allow higher RPM before the flyweights take action.
According to FAA regulations, which document must accompany an aircraft engine when it is sold or transferred?
Answer: The engine logbook reflecting current total time in service and time since overhaul
14 CFR 91.417 requires that engine maintenance records, including the engine logbook showing total time and time since overhaul, accompany the engine when transferred.