Mag Switch Malfunction

Aircraft electrical systems. Generators, both engine and wind driven. Other electrical systems, wiring, fuses, lighting and so on.
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zipperdu
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Joined: Sun Dec 19, 2010 11:41
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Mag Switch Malfunction

Post by zipperdu » Sat Jan 08, 2011 18:49

Hey folks,
I found I had a "sweet spot" on my mag switch that wasn't very sweet! It's the standard AAF Type A7 Switch thats used on most of these airplanes. I found if you move the switch to the off detent and push just slightly more, it aint off!!

Being a mechanic, I've had run-ins with bad mag switches before, it's not unheard of....

If your out there flipping that prop, you gotta know it could fire at any time!!

Please be careful.

Jon NC81488 7ac

Paul Agaliotis
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Location: San Martin, California
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Re: Mag Switch Malfunction

Post by Paul Agaliotis » Mon Jan 10, 2011 16:47

John,
If it's a B&S switch there is an AD for this very issue.
Paul
Mailing Adress : Paul Agaliotis 2060 E. San Martin, San Martin,Calif. 95046

zipperdu
Posts: 31
Joined: Sun Dec 19, 2010 11:41
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Re: Mag Switch Malfunction

Post by zipperdu » Mon Jan 10, 2011 18:18

Hi Paul,
There are two ADs, 53-26-01 and 50-04-01 both applicable to Briggs and Stratton Magneto Switches. The model numbers are B-5 and A-8 . As I read it the A7 switch in not applicable, however the failure mode is exactly like the 50-04-01.
Thanks for the reply.

Jon

Paul Agaliotis
Posts: 2480
Joined: Wed Dec 08, 2004 18:49
Location: San Martin, California
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Re: Mag Switch Malfunction

Post by Paul Agaliotis » Mon Jan 10, 2011 19:30

Jon,
The AD you need is 50-04-01. I don't know of B&S making an A-8 switch, I have never run across one. I guess we could ask the FAA for clarification.......................................................................... no, I'm just kidding!
Paul
Mailing Adress : Paul Agaliotis 2060 E. San Martin, San Martin,Calif. 95046

zipperdu
Posts: 31
Joined: Sun Dec 19, 2010 11:41
Contact:

Re: Mag Switch Malfunction

Post by zipperdu » Tue Jan 11, 2011 09:03

yeah,.............roger that!
Jon

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