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1. 06:37 AM - Re: Wing attach bolts (Mark Hubelbank)
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| Subject: | Re: Wing attach bolts |
One other thing to consider which is often a reason bolts "lose
torque" is that there was some contamination between the pieces of
aluminum when the bolts were first torqued. Then over time the
contamination changes character and things have to be tightened again.
Even a fraction of a thousands of dirt (hard to see) can cause trouble.
A .001 inch change results in about 10 degrees of rotation.
On 4/28/2017 8:57 AM, Ronald Steele wrote:
> Is it possible that you over torqued the bolts? It would have to be a
> pretty large over torque, so its hard to think its really the cause,
> but if they are over torqued just enough the bolt could relax and
> loosen just a bit. This is an intrinsic failure mode of steel and one
> of the things that makes it more forgiving to work with than aluminum.
> To be safe, Id replace all the bolts and check the calibration of
> the torque wrench when replacing.
>
> If you ever find the cause, Im sure many of use would like to know
> what happened.
>
> Ron
--
Mark Hubelbank
mhubel@nemon.com
Ch601XL-B Honda/Viking engine
Warp drive prop
708HU Electronic Control Unit.
www.n708hu.com
725 Hours airframe
360 Hours engine.
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