FAA Powerplant Written Practice Test

According to engine operation standards, an overhauled engine must only be test run...

1. When the system indicates a fault

2. If it meets noise regulations

3. Before being placed into service

4. After complete cooling

The correct answer is: Before being placed into service

Test running an overhauled engine before it is placed into service is essential for ensuring that the engine operates correctly and meets all necessary performance parameters. This procedure allows technicians to verify that the overhaul work was successful, checks for potential issues, and ensures that the engine functions safely and efficiently. During the test run, various parameters such as power output, temperature, pressure, and any unusual noises are monitored. This critical step is often part of the quality assurance process, confirming that the engine is ready and reliable for regular operation. If issues are detected during the test run, they can be addressed before the engine is put into service, helping to prevent failings during actual flight operations. The other options do not reflect the standard practice required for overhauled engines prior to service. For example, addressing faults discovered during the operation is important, but the definitive requirement is to ensure the engine runs properly before service. Additionally, compliance with noise regulations, while important, is generally part of ongoing operational considerations rather than a criterion for whether to test run an engine immediately after overhaul. Lastly, the cooling of an engine is a routine part of engine operation management but does not tie directly into the necessary testing requirements following an overhaul.