Patent ID: 8753084

Claim:
A back-up featherer for an engine arrangement having a main hydraulic actuator which operates a pitch change mechanism to angularly displace propellers of a propeller assembly of the engine arrangement, the pitch change mechanism and main hydraulic actuator rotating with the propeller assembly, wherein the back-up featherer has: one or more brakes located on a static structure of the engine arrangement, one or more input gears rotatable about respective axes, which axes rotate with the propeller assembly, the input gears being operatively connected to the brakes such that, when the brakes are activated, the input gears rotate about their axes, and one or more load application members which rotate with the propeller assembly and which are operatively connected to the input gears such that, when the input gears rotate about their axes, the load application members bear against respective engagement portions of the pitch change mechanism to apply a load to the pitch change mechanism which results in angular displacement of the propellers.