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 typically 30 seconds. This standard is based on ensuring that the engine is receiving proper lubrication as soon as possible, which is crucial for its operation and longevity. During the start-up process, oil must circulate within the engine, and it is important for the pilot or technician to monitor oil pressure closely to prevent potential damage from operating without adequate lubrication. If the oil pressure does not indicate within this time frame, it suggests an issue that could lead to engine damage if not addressed promptly. Waiting beyond 30 seconds can lead to unnecessary risks, as prolonged periods without oil pressure can harm engine components. Thus, 30 seconds is the recommended maximum time to wait for an oil pressure indication after starting the engine, reflecting industry standards for safe operation.