Eddie P
Well Known Member
Admission -I over torqued an axle attach nut yesterday when attaching some jack points on the main gear. (The jack points are the ones from Flyboy Accessories for the -8. They fit to the inside the the lower strut and require replacing the axle hardware attachments with slightly longer bolts).
I think I know why. But my first question is do you guys think I'm onto the right track in my theory to follow? I was using some anti galling compound to allow the bolts to slide into the holes easier and some of the material got into the threads of the bolts. I wiped down the threads before threading the nuts into place and I am pretty sure I was not careful to get all the compound out of the threads. I believe the compound lowered the torque of the spinning nut and allowed me to over tension the fitting since I assume the torque value is for a dry fitting. One of the nuts never reached my torque wrench click settings before stripping. Knowing that, I suspect the other three nuts have been over torqued as well. I was able to back them off and remove them normally. Of course I still have one nut that is stripped and will be removed with a nut splitting tool later today. I will discard all the hardware (suspected over tension on all) and re-installing new hardware without the anti galling compound of course this time.
Second question. My friend and A&P who is inspecting the aircraft for the C/I advised 5 foot-pounds torque for the landing gear axle nuts. The actual value we came up with was 50-70 inch pounds, 60 inch pounds seemed a good mid setting). So... 60/12=5 foot pounds target torque, on the wrench. I wanted to be sure this seemed accurate before I chance over torquing for a second round. I'm running out of hardware and luck, you see.
Thanks to the brain trust for your musings on my question, in advance. Fly safe.
I think I know why. But my first question is do you guys think I'm onto the right track in my theory to follow? I was using some anti galling compound to allow the bolts to slide into the holes easier and some of the material got into the threads of the bolts. I wiped down the threads before threading the nuts into place and I am pretty sure I was not careful to get all the compound out of the threads. I believe the compound lowered the torque of the spinning nut and allowed me to over tension the fitting since I assume the torque value is for a dry fitting. One of the nuts never reached my torque wrench click settings before stripping. Knowing that, I suspect the other three nuts have been over torqued as well. I was able to back them off and remove them normally. Of course I still have one nut that is stripped and will be removed with a nut splitting tool later today. I will discard all the hardware (suspected over tension on all) and re-installing new hardware without the anti galling compound of course this time.
Second question. My friend and A&P who is inspecting the aircraft for the C/I advised 5 foot-pounds torque for the landing gear axle nuts. The actual value we came up with was 50-70 inch pounds, 60 inch pounds seemed a good mid setting). So... 60/12=5 foot pounds target torque, on the wrench. I wanted to be sure this seemed accurate before I chance over torquing for a second round. I'm running out of hardware and luck, you see.
Thanks to the brain trust for your musings on my question, in advance. Fly safe.
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