bobmarkert
Well Known Member
My panel is going to paint this week so it won?t be long until Stein ships it to me (Stein, any chance of a sneak-peek once it?s back from paint?).
My question is: should the avionics bus relay be NC or NO?
At the Sport Air electrical workshop, the instructor said that if you use an avionics bus (that decision is made?. I will), you should use a NC relay. The logic is that if there is a power failure to the relay the NC relay would continue to power the bus. If you use a NO relay and there is a power failure to the relay you will lose your avionics bus. I asked if there would be a momentary power application to my avionics when I turned on main bus power (before the relay opened) and he said yes. He also said that some production airplanes (Piper?) use the same setup and you can actually hear a slight pop in the headset if you?re listening for it, but this will not harm modern avionics. All my buds at the airport that have an avionics bus have used a NO relay, not the suggested NC relay. Thoughts, input suggestions?
Thank You
My question is: should the avionics bus relay be NC or NO?
At the Sport Air electrical workshop, the instructor said that if you use an avionics bus (that decision is made?. I will), you should use a NC relay. The logic is that if there is a power failure to the relay the NC relay would continue to power the bus. If you use a NO relay and there is a power failure to the relay you will lose your avionics bus. I asked if there would be a momentary power application to my avionics when I turned on main bus power (before the relay opened) and he said yes. He also said that some production airplanes (Piper?) use the same setup and you can actually hear a slight pop in the headset if you?re listening for it, but this will not harm modern avionics. All my buds at the airport that have an avionics bus have used a NO relay, not the suggested NC relay. Thoughts, input suggestions?
Thank You