Today, as I've not worked on the plane for a while I decided it was time to do some more.
I machine countersunk the #40 rivet holes in the right and left F-857C angles that are common with the dimple countersink holes in the F-824-L&R-1 aft side skins
I machine countersunk the two F-814C-1 inboard seat rib angles, that attach to the F-805B-L&R-1 floor support angles . I then machine countersunk the two aft mid longerons as well.
F-889 R&L-1 aft mid longerons after countersinking.
