Worked on firewall pass-throughs

September 6, 2018 – I installed a couple of items on the firewall; the wiring pass-throughs and the fuel line connection.

I found the Avery pass-throughs at Aircraft Spruce, so I bought two of them. These will be for the wiring. As is usually the case, I’ll be running engine monitoring and sensing wiring through one, and heavy electrical through the other.

I put one pass-through in each upper corner of the firewall. I bought a set of punches at Harbor Freight. I drilled a 3/4″ hole using a Unibit to accommodate the punch.

Put the bolt part of the punch through, then crawled inside and put the die in place and tightened it down by hand. Went back outside and tightened the bolt until the hole was cut.

I used the flange to drill the screw holes, and deburred everything. Used firewall sealant on both sides, and clecoed the flanges into place. I’ll need help to install the screws, but that part is done.

I also installed the fuel fitting that goes through the firewall. I opted to use the doubler that they have you install on the firewall at the very beginning of firewall construction.  This doubler is for the optional Facet fuel pump, which I’m not using. This made more sense than installing another doubler just a few inches away when this one is not being used.

Time: 2:00

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