This document covers the procedure for testing the function of an Airmaster manual control switch (A0115).
Symptoms of a failed manual control switch may include open circuit indications (all lamps flashing red on the controller), or improper operation of the propeller in manual override mode (or AUTO/HOLD). A defective switch must be removed from service and replaced with a new airworthy component.
The manual control switch is a double -pole double-throw (DPDT) switch that facilitates manual adjustment of the propeller’s blade pitch. It connects to the controller via connector [CN3] located at the rear.
Manual Switch Assy Inspection 
