Hartzell HC-82XF-1 Owner's Manual page 65

Propeller Owner's Manual
175
It is undesirable to feather the propeller when the engine
is stopped after landing. To prevent feathering during
normal engine shut down, the propeller incorporates spring
energized latches (start locks). If the propeller rotation
is approximately 800 RPM or above, the latches are
disengaged by centrifugal force acting on the latch weights
to compress the springs. When the propeller drops below
800 RPM, the springs overcome the centrifugal force acting
on the latch weights and move the latches to engage the
start locks, preventing blade angle movement to feather.
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DESCRIPTION AND OPERATION
Dec/05