Sunday, November 10, 2024

Flap & Trim Wiring

I hope I'll never have to replace them, but I want parts like the flap motor and sensors to be easily swapped out without ripping out wiring.  I put molex connectors on the flap motor and flap position sensor and put together the wire bundles to run to the panel. 


I did the same for the aileron trim servo.  The wires on the servo are really small, so I had to double up the wire to get the molex pins to crimp well.  I think the crimps on the insulation probably would have been okay, but it didn't look like the crimps were all that tight because of the size of the wire.  I put a little shrink tubing on and crimped over that.


I pulled the flap, sensor and trim wires through the center right spar bulkhead hole.  The thought of wiring was pretty intimidating at first, but it's really not that bad when you take it bit by bit.  The most nerve wracking part at first was just the unknown and not knowing what went where.  I spent hours and hours in front of the computer researching all of the device requirements and the ACM functions.  AFS (makers of the ACM) have fantastic documentation as well, which was a huge help in figuring everything out.  Having a spreadsheet done with every device, wire needs, and termination points listed has made the actual act of wiring a non-event so far.

Next up I'll drill the holes in the seat ribs and run the wing wires to the terminal blocks.  The fuselage devices I still need to figure out requirements for and wire:
  • Seat heaters - have to figure out where the switches will live
  • ADAHRS - lives behind the baggage bulkhead. Pitot tubes go to it from the wings, data wiring comes from it to the subpanel
  • ELT - can't wire this until I order the actual unit.  It will go on the side skin bracket directly behind the baggage bulkhead
  • Transponder antenna - behind baggage bulkhead on the floor
  • ADSB antenna - behind baggage bulkhead on the floor
  • Comm antenna (x2 - probably just use one comm for a while, but may as well install the 2nd for future IFR) - outer bay under the seats
  • GPS antenna (x2 - one for AFS system, 2nd for future IFR GPS) - top of the tailcone
I think I can get most of the data wiring done without having the devices in hand.  I'll have to buy coax for the TX, ADSB and comm antennas.  The coax is going to be tougher to route, purely because of its size.  I may have to drill a few new holes in the spar bulkhead to accommodate all of the antennas.