(10-14 step 4):
After another way-too-long break (lots of things going on right
now!) I managed to slip out in the shop. 1st thing I did was
match drill the 4 screw holes in each of the F-824 cover plates and
skins. Plans call for a #28 drill but we don't have one that
size. Since these are screw holes as opposed to rivet holes, and
the difference in size between a #28 drill and a 9/64 is 1/10,000th I
used the 9/64 bit I had. After that I dimpled the cover plates
but not the skins yet... still need to debur those. These plate
will cover the access holes in the skin to access the elevator horns.
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(10-15 step 5): Next
up I removed the upper & two sides to the F-1006 bulkheads and
dimpled the common holes. These holes will get flush rivets
because the rear baggage bulkhead will rest up against them. The
lower piece in the pic is the baggage bulkhead channel. Since it
mates to the upper portion of the F-1006 bulkhead it'll get flush
rivets also.
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(10-16 step 4):
I then marked off all the holes not to dimple on the bulkhead and
frame flanges and started dimpling as I checked each piece for
scratches & deburred the holes. I've still got a few of the
frames to go because they're still clecoed to the skins.
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(10-15 steps 7-9):
No real ryhme or reason today I guess… just whatever comes
to mind. While I was dimpling the flanges on the F-1012A & B
bulkheads I went ahead and dimpled all the web holes. While doing
this I noticed the four #30 holes used to rivet the tie-down were only
drilled to #40, so I had to redo those. Once the two rear
bulkheads were all dimpled, I countersunk the mating holes in the
tie-down and also the rudder stop brace. And finally I dimpled
the flanges of the rudder stop skin stiffeners.
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