Various avionics steps

I added a circuit breaker in the "spare" location for the AFR, and also connected it to the essential bus - the label doesn't look as pretty as the engraving, but oh well:

Center panel with a new circuit breaker for the AFR sensor

then attached the ECUs:

EFII System32 ECUs attached in place

For running wires into the Bus Manager, I didn't like the idea of squeezing and bending them through the edge of the existing opening, so I made dedicated holes with a grommet for each post:

Bus Manager with ports drilled next to the terminals I'll use

Ring terminal aligned with the Bus Manager ports

Labeled Bus Manager ports

I still really dislike the box they made for the Bus Manager (e.g. hard to attach securely), so some day I'll probably make a new one with the same attachment holes as the ECUs - but that'll have to wait.

I also attached all the electrical items to the firewall, and the larger grounding block to the inside:

Insulated firewall with all components attached

Ground block attached to the firewall

I got more cables from Aircraft Specialty for passing through the firewall and connecting to the starter relay (I'll later also get cables to connect to the alternators and starter, but first I need to have more of the engine put together to know the best routing):

Main alternator/starter cable going through the firewall

Firewall cables connecting to the post inside the cabin and the starter relay

In preparation for installing the main wire bundle in place, I thought it was best to wire as much as I could of the alternator regulators at this time, while they were still accessible (somewhat, and painfully - those last two wires going to the alternators will be a major pain later):

Alternator regulators with most of their wiring attached

Attaching the GPS antenna doublers inside the overhead console required some planning - we couldn't reach the holes easily, so we ran some string through 2 of the screw holes for each one, pulled the string forward with the vacuum, attached them to the corresponding screw holes on the doublers, then applied epoxy+flox to the top side, and very carefully pulled them in place, while using the grounding wire to guide them (and avoid the overhead conduits which are just below the edge of two of them):

String running from the GPS antenna screw holes

GPS antenna doublers with strings attached for pulling them into place

Applying resin+flox to the top of the GPS antenna doublers

That was quite successful, and we secured them with the two other screws first, then cut and pulled the string out with the vacuum, attached the remaining screws and tightened it all to let the resin cure:

GPS antenna doublers screwed in place to let the resin cure

Finally, we applied some resin to finish covering the ground plane extension which was still slightly exposed:

Ground plane extension filled with resin

The next big thing on avionics is actually installing the main wire bundle and starting to connect all the EFII wires.

Time lapse:

Total avionics rivets: 161
Total avionics time: 161.0h

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