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l.p.t21(at)btinternet.com
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 Posted: Mon Jun 07, 2021 12:13 am Post subject: Cessna 180 electrical issues |
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p{margin:0}
Dear Bob et al.
I'm forwarding a call for help I received from a very good friend.

 Seems his electrics are playing up possibly as a result of and after 
the installation of an ADS-B transponder and 8.33Mhz radio.
Main question I guess is why are these strange events happening at low engine rpm?
Appreciate
 that in this scenario the alternator output is less but why would that 
"pop" circuit breakers and turn a transponder "ON"?
Could it be grounding/earth issue?
Any ideas would be very much appreciated.
Many thanks.
Patrick Elliott, UK
"The electric gremlins in the Cessna are bizarre.
Twice
 now I’ve had to land at night with no lights at all. Not even landing 
lights. (They have started popping their own circuit breakers!). And, I
 like flying at night.
So, here’s what I’m going to have the mechanic try.
Take out the mode S transponder and run over it with the tractor.
Wire the 12v lighter plug, which is important to keep the iPad going, to the old mode S transponder breaker.
Wire the navigation lights breaker directly to the main DC bus.
I have no idea what to do with the landing lights. Why would the breaker pop on (engine) power reduction?
Why in the world would the xponder turn ON? Your thoughts."
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Mon Jun 07, 2021 11:19 am Post subject: Re: Cessna 180 electrical issues |
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Post a schematic diagram of the aircraft electrical system, especially loads that draw 1 amp or more.
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