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Overvoltage, faulty switch

 
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rv-9a-online(at)telus.net
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PostPosted: Sun Apr 09, 2006 8:53 pm    Post subject: Overvoltage, faulty switch Reply with quote

Since my first flight of my RV-9A in January, I've been plagued with
over-voltage alarms.

I've been through the alternator field circuit several times, re-seating
fast-on terminals. This always seemed to fix the problem for several
operating hours.

On Friday, I was flying over the mountains when I had an alarm again, so
I shut the alternator off and began an in-flight diagnostic.

On the ground, my inspection revealed that I have a bad S700-2-10 switch
(my Master Switch).

All of the fast-on terminals are riveted in place on this particular
switch, and the rivets were quite loose, making the connections
intermittent and resistive.

My short term fix in flight was to wiggle the terminals by reaching
under the panel with my fingers.

I've contacted B&C for a replacement, and I've offered to send the bad
one back to them for analysis.

Has anyone else seen this problem?

Vern Little


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nuckollsr(at)cox.net
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PostPosted: Mon Apr 10, 2006 7:24 am    Post subject: Overvoltage, faulty switch Reply with quote

At 09:46 PM 4/9/2006 -0700, you wrote:

Quote:


Since my first flight of my RV-9A in January, I've been plagued with
over-voltage alarms.

I've been through the alternator field circuit several times, re-seating
fast-on terminals. This always seemed to fix the problem for several
operating hours.

On Friday, I was flying over the mountains when I had an alarm again, so
I shut the alternator off and began an in-flight diagnostic.

On the ground, my inspection revealed that I have a bad S700-2-10 switch
(my Master Switch).

All of the fast-on terminals are riveted in place on this particular
switch, and the rivets were quite loose, making the connections
intermittent and resistive.

My short term fix in flight was to wiggle the terminals by reaching
under the panel with my fingers.

I've contacted B&C for a replacement, and I've offered to send the bad
one back to them for analysis.

Has anyone else seen this problem?

Lots of people have had this and similar problems. See:

http://aeroelectric.com/articles/Anatomy_of_a_Switch_Failure/Anatomy_of_a_Switch_Failure.html

Bob . . .


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