Brief Description: Horizontal Stabilizer Front Spar Part 3
I machine countersunk the twelve holes in the front spar doubler for AN426AD4 flush rivets using my countersink cage and cutter.
I machine countersunk the middle nine holes in the top and bottom flanges of the spar for AN426AD3 flush rivets.
I marked the holes on the spar doubler and flanges that were to be countersunk with dashed lines just as a visual indication so that I didn't accidentally countersink the wrong holes.
