FAA Powerplant Written Practice Test

Who determines the oil and grease specifications for lubricating propellers?

1. The FAA regulations

2. The aircraft manufacturer

3. Propeller manufacturers

4. The propeller maintenance crew

The correct answer is: Propeller manufacturers

The propeller manufacturers determine the oil and grease specifications for lubricating propellers. This is essential because propeller manufacturers are responsible for the design and engineering of the propeller systems, including the materials and lubricants that are compatible with their products. They conduct thorough testing and analysis to ensure that the lubricants used will maintain optimal performance, reduce friction, protect against corrosion, and meet any operational requirements that pertain to specific propeller designs. In this context, other parties, such as the FAA, the aircraft manufacturer, and the maintenance crew, may provide guidelines or requirements that relate to overall aircraft maintenance and safety, but they do not specifically set the lubrication standards for propellers. The technical details, including the specifications for oil and grease, fall under the purview of the propeller manufacturer to ensure that the lubricants used will not affect the performance or safety of their propellers.