Which statement is true regarding the use of two bushings for the McCauley propeller on the PA28S-160?

The use of two bushings for the McCauley propeller on the PA28S-160 is specifically designed for application with a constant speed propeller. Constant speed propellers require a more complex mechanism than fixed pitch propellers, as they need to adjust blade pitch automatically for optimal performance in varying flight conditions. The two bushings facilitate the necessary adjustments and allow for the propeller's governor system to function correctly, ensuring that the blade pitch can change as needed to maintain engine efficiency and control.

In contrast, fixed pitch propellers do not adjust their angle during flight, which means they do not require the same bushing arrangement. The specific design and functionality of the bushing system are tailored for the needs of constant speed systems, making this configuration crucial for the operation of those propellers in conjunction with the PA28S-160 aircraft.