28 October 2009
Installing nutplates on spar

3.0 hours

Installing nutplates
Installing nutplates (Full size)

First thing to do is drill out the nutplate rivet holes and countersink them. Then alodine, and install the nutplates. Here I am installing the nutplates after those steps.

Countersinking bolt holes
Countersinking bolt holes (Full size)

After putting in the nutplates, the bolt holes need to be countersunk for the skin dimples. I used the cage countersink tool with a #30 pilot for the tank nutplates, and a #40 pilot for the access panel nutplates. After that, alodine the countersinks.


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