FAA Powerplant Written Practice Test

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

1. To analyze fuel efficiency

2. To determine satisfactory performance

3. To assess engine wear

4. To evaluate starting techniques

The correct answer is: To determine satisfactory performance

Performing a power check on a reciprocating aircraft engine serves the primary purpose of determining satisfactory performance. This check involves measuring different aspects of engine operation, such as RPM, manifold pressure, and engine temperatures, under specific conditions. By executing this check, pilots or mechanics can ensure that the engine is functioning within its designed parameters and producing the required amount of power for safe flight operations. A power check can reveal any discrepancies in engine performance that could indicate deeper issues, such as fuel delivery problems, ignition system failures, or mechanical wear. Thus, it is an essential diagnostic tool to maintain the reliability and safety of the aircraft. While assessing fuel efficiency, evaluating starting techniques, and evaluating engine wear are important factors in engine management, they are not the primary focus of a power check. Instead, the core objective is to confirm that the engine is operating properly and delivering the expected power output to support safe and effective flight.