FAA Powerplant Written Practice Test

Turbine engine lubrication system maintenance intervals are determined by which factor?

1. Engine operator's manual

2. Regulatory body guidelines

3. Set by the manufacturer

4. Industry best practices

The correct answer is: Set by the manufacturer

Turbine engine lubrication system maintenance intervals are primarily established by the manufacturer. This is because the manufacturer has thorough knowledge of the engine's design, materials, and operational characteristics, allowing them to determine the most effective maintenance schedule for optimal performance and safety. The manufacturer's recommendations are based on extensive testing and engineering analysis, which provide insight into how long the lubrication system components can effectively function before they require inspection or replacement. While the engine operator's manual is a valuable resource for operators, it primarily reflects the manufacturer's recommendations. Regulatory body guidelines and industry best practices can contribute to understanding maintenance requirements, but they are typically shaped by manufacturer input and do not override the specific intervals set forth by the manufacturer. Therefore, adherence to the manufacturer's specifications ensures that the engine functions efficiently while minimizing the risk of mechanical failure.