GJG1MU Posted May 13, 2021 Report Posted May 13, 2021 Pretty much lines up with what you guys were saying. But, we’re going to to pull the electric schematics to try to make better sense of it all. IMG_2524.MOV 2
carusoam Posted May 13, 2021 Report Posted May 13, 2021 Nice work GJ! You captured the essence... The avionics bus relay is normally closed... It opens when the master relay gets closed... When you force the alternate bus open, it takes the electricity away from the avionics relay and allows the avionics bus to return to its normally closed status again... While reviewing the drawings... you can build a logic chart of how each relay opens and closes... based on the electricity they are being fed... Its a great memory challenge... PP thoughts only, not a mechanic... Best regards, -a-
Yetti Posted May 14, 2021 Report Posted May 14, 2021 On some there is also a wire with a diode that comes from the key switch that opens the Comm Relay during starter engagement. You know to protect your electronics from spikes. That being said your electronic engine monitor should be on the main bus so you can see your oil pressure and such when starting the engine. Which gets a bit crazier when you have your engine monitor integrated with say a Skyview. So I put the 9" screen on the main bus. 1
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