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Rob's REBVAIR Project
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Date:  11-15-2015
Number of Hours:  6.00
Manual Reference:  
Brief Description:  Wires

Spent the weekend addressing the interconect wiring between avionics units. My 4 main units are the GTR200 comm, the Garmin GPS 400W, Trig TT31 transponder, and the GRT Sport EFIS.

The interconnection of the units is required because they need to share various bits of information with one another: For example, the EFIS encodes altitude data, which needs to be shared with the transponder, so it can then further transmit this to ATC. Similarly, the GPS400W is the position source for the transponder, allowing the latter to also share that with ATC as an Extended Squitter data stream for ADS-B 'out' compliance.

Then there's the EFIS, which needs ARINC 429 data from the GPS400W to drive the steering on IFR approaches. No, I don't plan on doing heavy IFR work in this plane, but I will want the flexibility to go through an occasional 2000ft AGL overcast layer on a cross country trip that ends in equal or better weather conditions.

The EFIS can also look up airport frequencies, and load them on the GTR200 comm radio so it needs a connection to do that also.

It's not difficult work, but it is tedious and you need to pay attention to detail. I double and triple-check my individual connections as I make them, because I can't begin to imagine how hard it would be to try and diagnose a system problem once the whole thing is buttoned up.

Surprisingly, I think l might actually be done with this and ready to move on by year's end.
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looks like a mess

looks like a mess

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ARINC 429 connector

ARINC 429 connector

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