Mag-earthed or live?
Thread Starter
Joined: Feb 2006
Posts: 40
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From: Ireland/Belgium
Mag-earthed or live?
Hi,
quick question about mags:
During run-up checks upon selecting an individual mag, are you earthing that mag and checking running on the other or are you selecting only that mag and therefore earthing the other?
I`ve managed to confuse myself!
regards
John.
quick question about mags:
During run-up checks upon selecting an individual mag, are you earthing that mag and checking running on the other or are you selecting only that mag and therefore earthing the other?
I`ve managed to confuse myself!
regards
John.
Joined: Jun 2001
Posts: 3,991
Likes: 8
From: UK
Another point worth making is that earthing the magneto is not "fail-safe" - another reason why props should always be treated as live!
If, when you do a mag check, there is ZERO drop when you select an individual mag then this would point to a live mag, in which case I would advise a check at idle power and momentarily selecting off and making sure the engine ceases to fire. If it continues to fire then you have a live mag the defect needs fixing asap!
If, when you do a mag check, there is ZERO drop when you select an individual mag then this would point to a live mag, in which case I would advise a check at idle power and momentarily selecting off and making sure the engine ceases to fire. If it continues to fire then you have a live mag the defect needs fixing asap!
Joined: Dec 2000
Aviation Qualifications: ATPL
Posts: 1,271
Likes: 40
From: Various
If you have the Leburg ignition then it gets a little confusing. Switching off the left ignition switch cuts supply power to the left ignition coil and vice versa. It is a "fail non-operational" system so that if the switch breaks, the ignition stops.
