AMT Maintenance Technician Oral & Practical Exam Guide (Dale Crane) questions with correct answers

In what position should the crankshaft be when a magneto is being timed to the engine? CORRECT ANSWER The piston in cylinder no.1 should be in the correct position for ignition to occur. This is normally about 30° before top dead center on the compression stroke. What is the purpose of a cold cylinder check? CORRECT ANSWER 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 other is the cylinder that has not been firing. What is checked on engine run-up to determine the operational condition of the engine? CORRECT ANSWER 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? CORRECT ANSWER 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? CORRECT ANSWER Piston rings not seating or broken,