F-1211B Bulkhead Doubler Countersinking Page 10-03

[BigJohn]

The instructions on Page 10-03 Step 3 Figure 2 tell us to countersink all the nutplate attachment holes for AN426AD3 rivets. I countersunk all the holes and checked them for depth with an AD3 rivet. When you get to Page 10-04 Step 10 Figure 2 you are told to use CCR-264SS-3-2 rivets for the four inner nutplates. After I installed and pulled these rivets I noticed that the heads are slightly raised (not flush.) This is probably not a good thing because this surface is where the vertical stabilizer (a rather important part!) is bolted on in a later step. I will drill out those eight rivets tomorrow and countersink the holes deeper. I think the point is, if the instructions on Page 10-03 had correctly stated what type of rivets all the holes should be countersunk for, this problem could have been avoided. Anybody else experienced this?

 

[Geico266]

Depending on how high up the are sticking I would just take a die grinder and take some of the top of the rivet off. If it is only up .005 of an inch or so it can be smoothed out without replecement.

 

[Fl Mac]

I always check the final rivet for flush before I pull or squeeze it. I did not notice the rivet change, but looking back I do remember some rivets not being flush when I placed the rivet in the hole and thinking I just did not counter sink then well enough and had to do more. Now I understand why.