A&P Powerplant Oral Questions, ASA-OEG-AMT2 | 100% Correct Answers | Verified | Latest 2024 Version

In what position should the crankshaft be when a magneto is being timed to the engine? - The piston and cylinder number one should be in the correct position for ignition to occur. This is normally about 30° before top center on the compression stroke. What is the purpose of a cold cylinder check? - A cold cylinder check determines which cylinder is not firing. Run the engine for a few minutes at the speed, and on the magneto, at which it runs roughest. Shut it down and feel the exhaust stack near the cylinder head. The cylinder with the stack that is not as hot as the others is the cylinder that has not been firing What is checked on engine run out to determine the operational condition of the engine? - Idling rpm and manifold pressure, engine acceleration, maximum static RPM and manifold pressure, magneto drop, ignition switch safety check, propeller pitch change, propeller feathering, oil pressure, fuel pressure, and fuel flow How can you determine the firing order of an 18 cylinder radial engine? - Begin with cylinder 1, add 11 and subtract 7, whichever will keep the numbers between 1 and 18. 1-12 - 5-16 - 9- - -4 - 15-8 What are two main causes of a cylinder having low compression? - Piston rings not seating or broken, valves not seating or burned. What is a hydraulic lock in an aircraft engine? - Oil has drained past the piston rings and filled the combustion chamber of cylinders that are below the center line of the engine. If the crankshaft is turned over with this oil in the cylinder it will lock, and there is a probability that the piston, cylinder, or connecting rod will be damaged. How is hydraulic lock removed from an aircraft engine? - Remove a spark plug from the locked cylinder and drain all of the oil out. Clean the spark plug and replace it.