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Task: Worked on seat backs
I worked on the two seat backs. While they are pretty straigh
tforward. there are a lot of holes to measure and drill. It
would have been a lot easier if the seat backs were punched
first measured and drilled the top and bottom 4 holes on each
F-637A seatback. I then clamped the F-637B angles onto each
side and drilled them to the seatback. The holes inboard of
about 6" were more difficult since my calipers didn't
extend that far out. I used the approx. dimension called out
in the plans (5/16" from the radius) to mark the location
for each of the 2 holes on either side of the inner bends.
I then drilled the seatback and then matchdrilled the F-637B
one F-637B angle was drilled to the seatback I could clamp
it to the opposite one and match-drill. This method worked
very well. I then clamped that angle to the seatback and match
drilled the seat back. I repeated this method for the other
Both seatbacks have been drilled to the F-637B angles.
I cut two pieces of AN257-P3 hinge 15.5" long for the
upper seatback support. I measured and drilled per DWG 30.
I match-drilled the hinge to the F-638-L seat back brace.
Rinse, lather, repeat for the right one.
Lastly I match drilled the other side of the hinge to the