Primed doublers and fork:
Clecoed doublers, fork, and inboard (service-bulletin; "SB") aileron bracket assembly to rear spar:
Closeup of two larger doublers:
Closeup of inboard doubler and fork:
Edited: Added this image to indicate which 6 holes need to be match-drilled on ribs 3/4:
Riveted inboard aileron bracket assembly to doubler and spar - note that I had to reverse the location of the shop head vs. manufactured head of several rivets since due to access (rivet set was obstructed by rivets on the hinge)
Other side, showing the two SB doublers for the inboard aileron bracket assembly:
Riveted other large doubler to rear spar:
Riveted small doubler to outboard end of rear spar:
Riveted fork and inboard doubler to rear spar:
Reamed large attach hole in doubler/fork using a drill press:
Clecoed rear spar assembly to wing assembly:
Riveted rear spar assembly to wing assembly - section completed (left side only):
Another view:
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