FAA Aviation Mechanic Powerplant (AMP)Engine InspectionMedium
After replacing a cylinder on a reciprocating engine, a mechanic performs an engine ground run per the maintenance manual before returning the aircraft to service. What is the primary purpose of this ground run in the context of the inspection process?
- ATo verify proper engine operation and check for leaks, correct temperatures, and pressures following the repair
- BTo calibrate the fuel flow gauge for the new cylinder
- CTo set the propeller governor for the new cylinder installation
- DTo break in the new spark plugs before flight
Show answer & explanationAnswer & explanation
Correct answer: A. To verify proper engine operation and check for leaks, correct temperatures, and pressures following the repair
A post-maintenance ground run is performed to verify that the engine operates normally across the power range and to check for fuel, oil, and induction leaks, along with confirming that oil pressure, oil temperature, cylinder head temperature, and other parameters are within normal limits before the aircraft is returned to service.
Why the other options are wrong
- B. Fuel flow gauges are not calibrated during a routine ground run.
- C. Propeller governor rigging is unrelated to a single cylinder replacement ground run.
- D. Spark plug break-in is not the stated purpose of a post-maintenance ground run.
Post-Maintenance Engine Ground Run
A ground run performed after engine maintenance verifies proper operation, checks for leaks, and confirms instrument readings are within limits before flight.
- Checks for fuel, oil, and induction leaks at the repair area
- Verifies oil pressure, oil temperature, and CHT are within limits
- Run across a range of power settings per the maintenance manual
Memory trick: Run it, watch it, leak-check it before you fly it