FAA Powerplant Written Practice Test

What is the primary purpose of conducting a power check on a reciprocating aircraft engine?

1. To assess fuel efficiency

2. To determine satisfactory performance

3. To check for oil leaks

4. To verify ignition timing

The correct answer is: To determine satisfactory performance

Conducting a power check on a reciprocating aircraft engine primarily aims to determine satisfactory performance. This assessment is crucial for ensuring that the engine is operating within its intended parameters and producing the appropriate amount of power during flight. Power checks can reveal performance issues related to engine efficiency, such as excess vibrations, abnormal temperatures, or irregular power output. By comparing the engine's actual power output to the manufacturer's specifications, mechanics and pilots can identify whether the engine is functioning correctly and safely. While other options may contribute to the overall assessment of an engine's health—like evaluating fuel efficiency or checking for oil leaks—these are not the main focus during a power check. The immediate goal is to ensure the engine meets performance standards, which directly impacts the aircraft's safety and operational effectiveness.