FAA Powerplant Written Practice Test

What function requires the use of a propeller blade station?

1. Adjusting the pitch of the blades

2. Measuring blade angle

3. Inspecting for structural integrity

4. Calibrating the speed control mechanism

The correct answer is: Measuring blade angle

The function that requires the use of a propeller blade station is measuring blade angle. A propeller blade station is a defined reference point along the length of the propeller blade, typically related to its chord line. This measurement is crucial for determining the angle of attack of the blade, which directly affects the performance of the propeller. Knowing the blade angle enables operators to evaluate the efficiency and effectiveness of the propeller in producing thrust. Accurate measurements can help in adjusting the performance of the propeller for different flight conditions, ensuring optimal operation of the aircraft. This is essential for both maintenance procedures and performance evaluations, especially in variable pitch and controllable pitch propeller systems. The other functions, such as adjusting the pitch of the blades, inspecting for structural integrity, and calibrating the speed control mechanism, involve different processes and tools that do not specifically rely on the defined reference points offered by blade stations.