spaceflightmeow
Active Member
When match drilling the FL-706 bracket to the flap spar, I have a problem with edge distance.
Here you see FL-706A's flange flush to the edge of the spar.
I backdrilled one of the holes through the spar into the bracket. Then I test fit an LP4-3 rivet in the hole. Unfortunately the rivet won't sit flat in the hole due to the manufactured head resting partially on the radius of the flange.
The rivet hole seems too close to the flange of Fl706A.
I see a couple of options: either remake the piece and let the flange of FL-706A hang a bit off the edge of the spar so that the pop rivet line is brought inward a bit and the heads sit flat. But then it wouldn't allow FL-706B to sit flush, which I could fix with a shim underneath FL-706B.
Other option is to grind down the flange radius on FL-706A around the rivet heads so that the sit flat. That seems incorrect.
What to do? Did anyone else run into this?
Here you see FL-706A's flange flush to the edge of the spar.
![thYE4qG.jpg](/community/proxy.php?image=http%3A%2F%2Fi.imgur.com%2FthYE4qG.jpg&hash=26b1e604275184eda6492f2cbac91d71)
I backdrilled one of the holes through the spar into the bracket. Then I test fit an LP4-3 rivet in the hole. Unfortunately the rivet won't sit flat in the hole due to the manufactured head resting partially on the radius of the flange.
![riGDVc7.jpg](/community/proxy.php?image=http%3A%2F%2Fi.imgur.com%2FriGDVc7.jpg&hash=3616e3a7237ee837d1b7f304d72ab662)
The rivet hole seems too close to the flange of Fl706A.
I see a couple of options: either remake the piece and let the flange of FL-706A hang a bit off the edge of the spar so that the pop rivet line is brought inward a bit and the heads sit flat. But then it wouldn't allow FL-706B to sit flush, which I could fix with a shim underneath FL-706B.
Other option is to grind down the flange radius on FL-706A around the rivet heads so that the sit flat. That seems incorrect.
What to do? Did anyone else run into this?