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Thread: Saab 340 incident report clarification needed
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Old 23rd April 2012 | 16:21
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DavidWoodward
 
Joined: Sep 2011
Posts: 127
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From: Manchester, UK
Auto-coarsen is basically an auto-feathering device. When the propellor drops below certain parameters, it will feather the propeller. It's usually used during take-off or landing.
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