Originally Posted by
Maoraigh1
"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.
Exactly.
I would suspect switches more likely to fail with the engine running (due sustained vibration). Why a mag check on shutdown important.