FAA Powerplant Written Practice Test

What is the maximum time to wait for an indication of oil pressure after starting a reciprocating aircraft engine?

1. 15 seconds

2. 30 seconds

3. 1 minute

4. 2 minutes

The correct answer is: 30 seconds

The maximum time to wait for an indication of oil pressure after starting a reciprocating aircraft engine is 30 seconds. This parameter is crucial because oil pressure is vital for ensuring that the engine is adequately lubricated and to prevent internal damage. During the starting process, the oil must circulate and build pressure to ensure proper lubrication of engine components. Waiting for an oil pressure indication longer than 30 seconds could indicate a potential issue, such as low oil levels, a malfunctioning oil pump, or a blockage in the oil system. If oil pressure is not indicated within this timeframe, it would typically necessitate further investigation before continuing to run the engine, as prolonged operation without oil pressure can lead to significant engine damage. This 30-second guideline is a standard practice within aviation maintenance and operations to promote safety and engine integrity.