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As the one who initiated the discussion on the
correct torque value for the wing bolts, I feel compelled to share with the
group the final results of the discussion here on the forum and of my direct
communication with Univair:
1.) The wing bolts need to be torqued properly,
just "tightening them really well" is not sufficient.
2.) There are no recommended values by the
manufacturer, so AC 43.13-16 is the appropriate source
3.) The large and the small bolts used for the
main wing attachment are indeed shear bolts. The nuts are, however, tension type
nuts. This had led to some confusion during the discussion about whether to use
shear- or tension values.
4.) The proper torque values are 1100-1300 inch
lbs for the large bolts/nuts at the leading edge and 100-140 inch lbs for the
smaller bolts/nuts at the trailing edge. Both values are indeed shear
values.
I have (for obvious reasons) only confirmend these numbers for
the Mooney M-10. I am assuming that they are the same for Ercoupes / Aircoupes,
but I urge everybody referring to this information for their own assembly to
check for themselves in case the type of airplane is different.
Safe flying, and have fun.
Stefan in Tokyo
Mooney M-10 Cadet
N9547V
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