This document covers the procedure for replacing the pitch change motor inside DC versions of the Airmaster propeller hub. This procedure does not apply for brushless motors used in digital servo-drive (DSD) propeller systems. This procedure may be performed with the hub mounted to the engine flange, and the blades installed.

Airmaster offers several types of DC pitch change motors, the most common being the Faulhaber and Maxon versions. Specific instruction pertaining to different motor types are provided in the following sections. After replacement, the controller may need to be reprogrammed before next flight.

Replacement of the pitch change motor may be required due to a failure, or for compliance with service instruction. Symptoms for a failed pitch change motor may include an open circuit alarm (all lamps flashing red on the controller), intermittent control, or loss of operation of the propeller.

PC Motor Replacement