Troubleshooting & Diagnostics Flashcards
7 cards from real AM practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Troubleshooting & Diagnostics flashcards as text
An aircraft engine experiences intermittent power loss only at high altitude. Which system is the most likely cause?
Answer: Mixture control or fuel metering unit malfunction
Altitude-related power loss typically indicates a fuel metering or mixture issue since fuel-air ratio requirements change significantly with altitude.
During run-up, a magneto drop is 175 RPM on the left magneto and 50 RPM on the right. What does this indicate?
Answer: The left magneto or its spark plugs have a problem
An excessive drop on one magneto indicates a fault in that magneto, its leads, or the spark plugs it fires; the right magneto's low drop is normal.
A hydraulic actuator moves slower than normal but maintains full travel. Which fault is most likely?
Answer: Restriction in the hydraulic line or internal bypass/wear
Slow but full-travel movement suggests a flow restriction or internal leakage allowing the actuator to eventually reach full extension.
When troubleshooting an avionics unit that shows no display, the FIRST step per standard procedure is to:
Answer: Check circuit breakers and power supply to the unit
Always verify power and circuit breaker status before condemning or removing any avionics unit.
An aircraft landing gear indicates 'gear up' in the cockpit but the red warning light remains illuminated. What should be investigated first?
Answer: Proximity sensor or micro-switch alignment on the gear
A disagreement between the position indicator and the warning light often points to a misaligned or faulty proximity sensor or limit switch.
Excessive oil consumption with blue smoke from the exhaust on an aircraft piston engine most likely indicates:
Answer: Worn piston rings or cylinder wall glazing
Blue exhaust smoke indicates burning oil, which enters the combustion chamber through worn rings or glazed cylinder walls.
A pitot-static system leak check reveals the altimeter drops more than the allowable rate. The CORRECT action is to:
Answer: Locate and repair the leak, then re-check the system
FAR/maintenance standards require that any leak exceeding the allowable rate must be repaired and the system re-tested before the aircraft is returned to service.