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Washer stacks work and I used that technique sometimes but I also had a supply of 1/4 inch long phillips head #8 screws. I preferred them over the washer stacks.
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The product must "meet or exceed" X cycles and retain run on torque.... Similar to the TBO on a Lycoming, if you can get more out of it, that's great! |
By accident I found that the nut plate AND the screw wear in with cycles. I noticed that the hardware store stainless #6, #8 screws wear in pretty quickly. Then using a proper aviation screw the install friction torque jumps significantly.
You might experiment with this to get a better feel for it. |
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http://www.everyspec.com/MS-Specs/MS...47F.034285.pdf Did they add them when they became SAE specs? Or are you referring to later, fancier, more expensive nutplates than we typically use? The MS21047 - http://aircraftfast.com/thumb.php?im...IF&w=300&h=300 |
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I've never seen any reference to nutplate replacement after x cycles, in 20 years of both .civ and .mil helicopter maintenance, on multiple models from every "major" helicopter OEM (except the Russian OEMs). Plenty of references to loss of run-on torque, prevailing torque, and locking ability... but never "replace nutplates after x remove/install cycles".
Nutplates are an "on-condition" item, just like common panel hardware. |
fiber
I think they are confusing fiber lock nuts with metal nutplates.
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Yes, they are "on condition"...
Yes, there is a material specification that states the nut plate must meet or exceed xx cycles. Don't confuse this "minimum specification" with a "recommended replacement schedule". If they meet run on torque, they are serviceable. ...but the point remains they do wear out eventually. We replace them by the thousands in depot. |
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