Project: TerryS     -     Entry

Sep 17, 2022 8 wheels/tires & brake flanges Category: Landing Gear
couple of partial days work here. Built up the wheels without issue. Ran to the shop at work and borrowed a bottle of baby power to lube the inside of the tires, made tube insertion easy. can't get talc anymore because its a carcinogen. They use corn starch baby power now. worked fine.

Installed the brake caliper flanges on the axles. This has to be one of the worst documented assemblies on the whole airplane. With lots of scrutiny and playing with parts I finally figured it out.

FYI- the allen head screw that holds the flange on the axle is a special type of screw with a smooth shaft and a smaller coarse thread nut. Two of these screws came in hardware bag 1968-1 with the fuselage kit, which I thought was strange at the time. when I got the finishing kit, there were two more, along with nuts, & washers in bag 914-3, which was stapled to the bag the axle spacers were in. Clearly this is the bag for brake parts.

I asked on VAF what the two screws in bag 1968-1 were for, thinking that I had perhaps used the wrong hardware in a previous operation. Nobody had an answer, and lots of people had the same scenario. As of right now, nobody knows why we have 4 of these.

Note- the stackup on this includes 2 washers under the nut that are different sizes. The big on refits over the smooth shaft of the screw and the smaller steps it down for the threads. Hard to describe, but it would be easy to get the inner washer hung up on the shoulder where the threads end and bind it up in such a way that you're not actually torquing down against the collar. due diligence is required.

Also as part of this operation you make spacers out of hard aluminum tube to space the wheel part bracket away from the brake caliper. I have my doubts that aluminum is hard enough to hold appropriate clamping force against something that gets as much vibration and general abuse as a wheel pant. I'm going to keep an eye on this and if they start to loosen up over time I think I might remake these out of steel.

Had to relive some interference between the brake caliper and teh wheel pant mounting plate on both sides. accomplished with a rotary file.


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