propeller brake

propeller brake

A friction brake used on turboprop engines to prevent the propeller from wind-milling in flight after it has been feathered and from rotating when the engine has been shut down. In a free turbine, it prevents prolonged wind-milling when the aircraft is parked.
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The SI 2 is equipped with a propeller brake to stop its windmilling, which reduces wear on the propeller clutch.
Just as we began to give up hope and prepared to execute the "prop fails to feather" checklist, the RPM began to decay and the propeller brake finally engaged.
With the MIMs in hand, we continued to the next step, which was to check the propeller brake.