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Andrews Web Site
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Date: 12-6-2015
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Number of Hours: 10.00
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Manual Reference:
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Brief Description: Fuselage Aft Section Rebuild
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When I set up my fuselage in the new hangar, I was able to shoot it with the laser level from a greater distance away, and with greater precision. I noticed that if I properly oriented the front portion of the tailcone, I had about 0.10 inches of twist (say +.05 inches at the top, and -.05 on the bottom) at 149.625 bulkhead. I would put this in the "not terrible" catigory by itself, but I also noticed that the next two bulkheads (159.625 and 164.25) were much further off. The 159.625 bulkhead was off in the same direction as the 149.625, but even more exagerated. The 164.25 bulkhead was not quite as bad, but still, it was off. I decided that I wanted to minimize the twisting, and the only way to do that that I know of, is to pull the back two bulkheads out, and rebuild. The pictures shown here show the fuselage after carefully pulling the bulkheads out. I knew it would be tough to get the bulkheads out without having oversized holes. As a result, when I built the new bulkheads, I put very generous flanges on them so that I could go to the next bigger diameter rivets. I also allowed for double rows of rivets in some areas. Other pictures show some of the old bulkheads and fittings next to the new ones.
Doing this sort of thing is painful, but I really wanted to try to do the best I could.
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One of the Many Alignment Assessments Made Prior To Rebuild Decision
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Aft Fuselage After Bulkhead Removal
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Showing Some Old and New Bulkheads
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