Which item is not typically checked during engine runup?

Which item is not typically checked during engine runup?

• A. Cylinder head temperature
• B. Oil pressure
• C. Idling RPM and manifold pressure
• D. Magneto drop

Answer: (A)

During an engine runup, the main goal is to confirm the ignition and lubrication systems are functioning and that the engine can deliver power safely. You verify the ignition system with a magneto check to ensure each magneto is producing a proper spark and that the drop between magnetos is within limits. You also confirm oil pressure is within normal range at operating speed, indicating the lubrication system is working, and you check that idle speed and the response of the throttle and mixture (as shown by idle RPM and manifold pressure) behave correctly. Cylinder head temperature, however, is not part of the typical runup checks. It reflects the engine’s thermal state under operation and cooling performance, which becomes relevant after the engine has warmed up and is running at operating power. This temperature is monitored more during flight or after startup as the engine reaches cruising or climb conditions, rather than during a brief runup intended to verify sparks, pressure, and speed.

During an engine runup, the main goal is to confirm the ignition and lubrication systems are functioning and that the engine can deliver power safely. You verify the ignition system with a magneto check to ensure each magneto is producing a proper spark and that the drop between magnetos is within limits. You also confirm oil pressure is within normal range at operating speed, indicating the lubrication system is working, and you check that idle speed and the response of the throttle and mixture (as shown by idle RPM and manifold pressure) behave correctly.

Cylinder head temperature, however, is not part of the typical runup checks. It reflects the engine’s thermal state under operation and cooling performance, which becomes relevant after the engine has warmed up and is running at operating power. This temperature is monitored more during flight or after startup as the engine reaches cruising or climb conditions, rather than during a brief runup intended to verify sparks, pressure, and speed.