SECTION 25: MID FUSE BULKHEADS: Difference between revisions

SECTION 25: MID FUSE BULKHEADS (view source)

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 Later in the build process (Section 28, page 28-12, Figure 2) you will need to have 7x double-flush rivets on each side of the forward main spar. That requires you to machine countersink the top/inside of the bottom flange for those 14 holes. The outermost holes on each side are very hard to properly countersink after you have attached the F-01004C center section bulkheads.
-So, while you are on this step, I recommend machine countersinking on the top side of the bottom flange (you'll CSK all of the holes in the bottom flange later as part of the normal instructions but they'll be deeper than normal due to the thickness of the bottom skin). I countersunk the top holes approximately the same size as I would do for a normal countersunk rivet factory head. See image on this page.
+So, while you are on this step, I recommend machine countersinking on the top side of the bottom flange (you'll CSK all of the holes in the bottom flange later as part of the normal instructions but they'll be deeper than normal due to the thickness of the bottom skin). I countersunk the top holes approximately the same size as I would do for a normal countersunk rivet factory head. See the image on this page for what it will look like when you are done with Section 28.
 [[File:2024-09-18 15.33.48.jpg|thumb|Seven double-flush rivets -- this is the top of the bottom flange of the forward bulkhead, and these are the shop ends of the rivets flush due to the countersinks.]]