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Dave's RV-7A Builder's Log
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Date: 5-31-2015
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Number of Hours: 6.00
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Manual Reference:
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Brief Description: Avionics installation
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Today was a deeper dive into the avionics installation. As previously mentioned, I needed to make some changes to the wiring harness due to the addition of a second radio and the switch from a GNS 400 to a GTN 625. During the last session I had removed the connector from the backshell for the GNS 400 and now I was ready to swap pins into the new connector. The process really is quite simple and the tool supplied by Steinair made it even easier—just slip the “remove” side of the tool into the socket, pull on the wire and the pin pops out. Find the correct socket on the new connector, flip the tool around to the “insert” side and set it in place. After each pin swap I ran a quick continuity check to make sure things were in the right place.
I will need to place an order for electrical supplies as I have a couple of additional wires to run for the GTN 625, and after really examining my options, I think I need to move the transponder to a different location…more on that in a second. Also, I found that most of the connectors for the G3X use standard D-SUB sockets, but the connectors for the GTN and GMA 240 audio panel use high density pins. Since Steinair only sent the pins with my order, I’ll have to get some sockets as well.
After working on the harness, I moved to the aft deck where I fitted and drilled the GMU 22 attach plate to the structure. With the vertical stabilizer directly above, it’s going to be a bit tough to get rivets in, so I may need to get some brass screws since I can’t use magnetic fasteners in that location. Finally, I spent about an hour of the session trying to figure out where I was going to place the GTX 23. The transponder is actually fairly heavy (about 4 lbs) and requires a very solid attach location. There just isn’t space behind the panel for that, so I think I’m going to move it to a place under the baggage floor—this means I will have to break the Steinair wire harness and forge my own path...that could be fraught with peril!
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Riveting GMU 22 attach bracket
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Match drilling to aft deck
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