FAA Powerplant Written Practice Test

What is the responsibility of the FAA regarding the TBO number for an aircraft engine?

1. To determine the TBO number based on engine performance

2. To ensure the manufacturer has determined this number

3. To set a universal TBO for all aircraft engines

4. To provide training on TBO determination

The correct answer is: To ensure the manufacturer has determined this number

The responsibility of the FAA regarding the TBO (Time Before Overhaul) number for an aircraft engine primarily revolves around ensuring that the engine manufacturer has established this number. The FAA's role includes oversight of the certification process for aircraft engines, which encompasses evaluating and approving the operating limits specified by the manufacturer. TBO is determined based on the engine's design, performance, and operational conditions, and it is the manufacturer's role to conduct the necessary testing and gather data that support their TBO recommendations. The FAA confirms that these manufacturer findings are compliant with applicable regulations and standards but does not set the TBO number itself. Instead, it is the manufacturer who has direct experience and data regarding their engines and is best positioned to specify the appropriate TBO, considering various factors including maintenance practices, operating environments, and historical performance. This ensures that the safety and reliability of engines remain paramount while adhering to the regulatory framework established by the FAA.