Electrical penetration of the firewall

[Bryan Cotton]

Hey all,
Been planning my next firewall penetration. I noticed that some of you (like Ryan's Waiex) have a firesleeve hose clamped to something that screws on the firewall. Is this a made or bought part? How big of a hole did you need?
Thanks!

[Bryan Cotton]

I just found them at Spruce. I think I'll make my own.

[peter anson]

Hi Bryan, I used several small Mil-spec connectors https://en.wikipedia.org/wiki/U.S._Military_connector_specifications
You can get them with solder terminals so don't have to buy expensive crimping tools. Can be fabulously expensive but my guess is that it may be possible to buy used or surplus ones. They are entirely reliable. The ones I used have only 6 connections per plug so wiring was pretty simple.
Peter

[Rynoth]

Hey all,
Been planning my next firewall penetration. I noticed that some of you (like Ryan's Waiex) have a firesleeve hose clamped to something that screws on the firewall. Is this a made or bought part? How big of a hole did you need?
Thanks!

Mine was this kit from ACS:

https://www.aircraftspruce.com/catalog/ ... kkey=33137

The fitting was just a simple stainless steel plate with a hole in it, with a stainless steel ring welded onto it to give the sleeve something to hose-clamp to. It wouldn't be difficult to make if you knew what you were doing. Mine was a 1-inch hole, which was enough room for all of my electrical wires.

[Jim1342]

Tony Bingelis offers an inexpensive homemade penetration which is published on the EAA website.
https://www.eaa.org/en/eaa/aviation-com ... et-shields

[n307tw]

I agree with Ryan. I used the 1 inch kit. Yeah it’s kind of expensive but one hole and all the wires go through it and it looks neater and professional. I’m not done yet but I attached some pics of my progress so you can see what I mean. Hope this helps.

-Tim


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[Bryan Cotton]

Thanks guys! I have the Bingeles books and had seen that shield before. I did poorly forming them with the stainless I had on hand, and where do you get asbestos washers? I will probably make one like the Spruce offerings out of 4130 to match my leftover fire sleeve.

[woodmw]

Could you cut some round disks out of fire sleeve to use in place of the asbestos washers?

[Bryan Cotton]

Could you cut some round disks out of fire sleeve to use in place of the asbestos washers?

That is a great idea!

[9GT]

These are a great low cost solution for firewall penetrations. Buy a foot of appropriate fire sleeve and a couple clamps and you have a professional looking fire barrier to the cabin. https://www.amazon.com/uxcell-Diameter-Silver-Stainless-Flange/dp/B00E1HEGTO . When you have all your wires run through, don't forget to stuff the penetration with some 3M Fire Barrier 2000 sealant: https://www.aircraftspruce.com/catalog/ ... kkey=13950 , then worm clamps, one holding the fire sleeve on the flange, the other over the end of the fire sleeve where the wires exit into the engine compartment. Don't fool yourself into thinking you could use high temperature RTV instead of the expensive 2000 sealant. There is no comparison in actual testing results.