PPRuNe Forums - View Single Post - Safety around propellers
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Old 30th Jan 2019, 19:36
  #110 (permalink)  
Join Date: Feb 2017
Location: Sydney
Posts: 326
Originally Posted by Maoraigh1 View Post
"Whilst not impossible, I am guessing it would be pretty unlikely for a mag to cut OK on shutdown and then go live afterwards."
As mag switches earth the mags, any break would make the mag live.
Vehicle ignition switches fail dead - and the engine stops.
Mag switches fail live, so the engine doesn't stop, and you keep flying, still with 2 mags.

I would suspect switches more likely to fail with the engine running (due sustained vibration). Why a mag check on shutdown important.
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