Posted by farmallhal on April 22, 2012 at 11:10:51 from (76.4.178.207):
In Reply to: Re: fine thread bolts posted by Janicholson on April 22, 2012 at 10:46:21:
Jim, The engine on the United DC-10 had a fuse pin failure as I recall. The bolt just was to hold the fuse pin in place and wasn't a real load bearing component. The fuse pin is a cylinderial machined piece which held the engine strut or plyon through it's mount to the fittings on the lower wing structure and the bolt was only something probably less then a .500 inch diameter merely to keep the fuse pin in place. Those engine attachments were usually line bored on installation with the straightness and hole size tolerence of something like +.0005/-.0000 while the fuse pin was probably super cooled in liquid nitrogen at installation - assuring a very precise fit. There are also very close limits on the amount of pre-load at installation that can be applied through wing deflection to permit strut to wing installation. I didn't work on the McDonnell Douglas products but know their installations were very similiar to those we used at Boeing back in my pre-retirement life, Hal.
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