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Thanks for the reference.... One must remember that these bolts are in
"Shear", not "tension", and must not be torqued to tension
specs for the size of the bolt.
From Univair SB 31 (Wing Centre Section Inspection):
"The recommended method for tightening the nuts on the wing attach
bolts is to draw nuts down tight and continue tightening as required to
line up
the nearest slot and cotterpin hole provided you do not exceed 100
ft-lb dry
torque on the front bolts and 10 ft-lbs dry torque on the rear bolts.
Safety
wing attach bolts with NEW cotter pins: AN380-4-4 (MS24665-353) for
front
and AN380-2-2 (MS24665-132) for rear fittings. DO NOT reuse old cotter
pins."
"The recommended method for tightening the nuts on the wing attach
bolts is to draw nuts down tight and continue tightening as required to
line up
the nearest slot and cotterpin hole provided you do not exceed 100
ft-lb dry
torque on the front bolts and 10 ft-lbs dry torque on the rear bolts.
Safety
wing attach bolts with NEW cotter pins: AN380-4-4 (MS24665-353) for
front
and AN380-2-2 (MS24665-132) for rear fittings. DO NOT reuse old cotter
pins."
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