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You have a pretty good setup BUT… I had an avionics master breaker (switch type) in my Bonanza that failed. What happened was that the housing cracked behind the panel. The switch failed open on an IFR flight when the housing was no longer able to hold the contacts together. Your DPST switch can fail in the same way and will fail open. Both sides will be open from this common mechanical cause. My solution was to put in two separate breaker switches in parallel. I turn only one on at a time. If one fails I can simply turn on the other. From: Bill Harrelson [mailto:n5zq@verizon.net]
Sent: Sunday, August 07, 2011 10:57 AM
To: lml@lancaironline.net
Subject: Re: [LML] Re: Fw: Re: Re-doing my panel - carefully thinking through failures My avionics switch is a DPST switch. Basically two switches in one. Each side controls the power feed from one electrical system. Sure, both sides of the switch could fail at the same time but that would be unlikely. On top of that I have a separate, isolated switch that feeds power only to the GPS/Com so that even if both sides of the avionics switch should fail or both electrical system 1 and 2 fail, I can power this unit from system 3. System 3 is an 8 amp B&C generator and an Odyssey 545 battery. N6ZQ IV under construction Fred, Even with all the extra weight and redundancy, your avionics are all reliant on a single switch. If that $7 switch goes, your plane is blind, deaf, and dumb! The aeroelectric list does not recommend an avionics buss. This is part of the reason for that. Bill B
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