The function of a propeller pitch lock is to prevent the propeller from
- coarsening.
- reducing below flight fine pitch.
- fining off in the event of pitch lock mechanism failure.
Jordi asking:
i found an answer :leaflets refer to a pitch lock that holds the fine pitch stop in position, but also adds that some
manufacturers have a pitch lock device that locks the prop in its last position in the event of failure of the pitch lock
mechanism. For a description of this system see Jeppesen Aircraft Propellers and Controls page 136.
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