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esteuber(at)rochester.rr.
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 Posted: Sat Jan 14, 2006 5:06 am Post subject: nuts and bolts |
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You guys are correct about the turning bolts versus the compression bolts. The nylocs are suppose to be used in a non heat environment and metal locks used in "high" heat areas. And I mean HIGH HEAT areas like exhausts. You can correct me if I am wrong (and I know you will) but on a few engines ( P&W R-985 comes to mind) the thing is literally put together with Nylocs everywhere. I have been operating and maintaining these engines for 32 years cropdusting and I have never seen a Nyloc (big or small) lose its locking ability from heat...or melt out the Nyloc material. So when someone tells you ..no nylocs forward of the firewall , there are exceptions .......and in this case some very big ones....... Anybody know why every P&W overhaul shop in the country does this ? ....What's the basis for approval ?
When I am working on standard category aircraft I follow all the "rules"..... but on my Ultralights (non N numbered) I do what's "necessary" ...
Enquiring ED in Western NY
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rsanoa
Joined: 10 Jan 2006
Posts: 71
Location: Bell Buckle,TN
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| Posted: Sat Jan 14, 2006 7:59 am Post subject: nuts and bolts |
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I too have used 'nylocks' since WW2. The antiquated rules about no nylocks on moving joints started before the nuts all had a nylon insert. If you are as old as I, you will remember the first ones had a fiber material insert. These could truly only be used one time and there was no 'sticky' grasp as with the nylon inserts, which will continue to grab after many, many removals. Not so with the first fiber insert nuts. I can understand the possibility of continued turning forces starting those nuts to slowly unwind. The rule should be updated to reflect modern materials, but FAA wheels turn slowly. Don't believe I've seen any of the fiber ones in many years, although I still have some in my parts cans.
Ray
UltraStar
do not archive
Edward Steuber <esteuber(at)rochester.rr.com> wrote:
You guys are correct about the turning bolts versus the compression bolts. The nylocs are suppose to be used in a non heat environment and metal locks used in "high" heat areas. And I mean HIGH HEAT areas like exhausts. You can correct me if I am wrong (and I know you will) but on a few engines ( P&W R-985 comes to mind) the thing is literally put together with Nylocs everywhere. I have been operating and maintaining these engines for 32 years cropdusting and I have never seen a Nyloc (big or small) lose its locking ability from heat...or melt out the Nyloc material. So when someone tells you ..no nylocs forward of the firewall , there are exceptions .......and in this case some very big ones....... Anybody know why every P&W overhaul shop in the country does this ? ....What's the basis for approval ?
When I am working on standard category aircraft I follow all the "rules"..... but on my Ultralights (non N numbered) I do what's "necessary" ...
Enquiring ED in Western NY
---------------------------------
Photo Books. You design it and well bind it!
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