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What is autofeather and when is it used?

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    $\begingroup$ Related: Autofeather on Wikipedia. I believe you don't use it, it's automatic. $\endgroup$ – mins Jul 29 '16 at 14:06
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    $\begingroup$ @mins Can't it be enabled/disabled on some aircraft? Perhaps that's what is meant by "used". $\endgroup$ – Steve Jul 29 '16 at 17:12
  • $\begingroup$ @Steve: Yes, e.g. on the Beech SKA 350, there is an autofeathering switch and a manual feathering on propeller levers. Overall autofeather enters in action when armed and the propeller starts generating more drag than thrust. Source and additional information. $\endgroup$ – mins Jul 30 '16 at 12:06
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Autofeather is an automated feathering feature, common in a lot of turboprops, which automatically feathers the propeller on an engine if it loses power without having to either pull the power or propeller lever to feather the prop.

It reduces crew workload in the event of an engine failure and, as a feathered propeller greatly reduces parasite drag on the side of the dead engine, reduces the asymmetrical thrust yaw moment about the vertical axis of the airplane.

It is particularly useful during takeoff and landing operations where airspeed may be very close to minimum controllable airspeed on one engine.

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    $\begingroup$ You could make it even better by explaining what feathering is? $\endgroup$ – Simon Jul 29 '16 at 16:30

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