June 19, 2005

I didn’t really spend too much time at the hangar today, due to going out to an Oasis concert last night. It was absolutely great. So, I needed a bit of a lie in this morning!

I finally got around to mounting the FADEC busses. I chose to put them in this location to try to minimise wiring runs. Hmmmm. Easier said than done with all this stuff going on behind the panel. Here you can see I have already wired the feeds.

I also got the switch wired. I ran the FADEC A from the main bus, and the FADEC B from the E-Bus. With the dual alternator system, I think we should be OK as far as redundancy goes. Dan Parson’s spoke to the FADEC guys and found out the current draw for the system is around 5.5 amps. I probably could’ve got away with using thinner wire for these runs, but decided to go with 14 gauge. The run has to go from the main bus and E-Bus to the switch and then to the FADEC busses. I ran the ground wire for the Enable A and B while I was at it. You may notice that these switches are different to the ones I had a couple of shots back. I figured if I got some double pole on-off-on switches that I could use the same switch for the FADEC power and the Enable grounding. When the switch is down, the system is off and the Enable is grounded. When the switch is up, the system is on and the Enable ground is disconnected. I was considering not having switches for the system power at all, and just wiring the FADEC busses direct to the main busses, but figured it might be a good idea to be able to isolate a system properly. I guess it’s on the Aerosance drawings for a reason. I might give Aerosance a call to make sure my switch arrangement is acceptable.