Help requested - wing hinge washers
Posted: Sat Aug 19, 2023 8:27 am
I'm about to do the final riveting for the flaps and ailerons and have bolted them onto one wing. However, the KAI is very unclear regarding which washers go where for the hinges.
I've contacted tech support, who advised that it should be Bolt > Thin Washer > Hinge > Thick Washer > Bearing > Thick Washer > Hinge > Thin Washer > Nut on all 5 hinges. This seems wrong though. The outboard (wingtip) aileron bolt is a -7 whereas the others are all -6. Two thick washers in the centre positions mean there is no thread to protrude past the end of the locknut with the -6 bolts. In addition, looking at the left wing hinges from behind, it seems that there is a shim on the left side (only) of the hinges where they are riveted together. This suggests Hinge > Thick Washer > Bearing > Thin Washer > > Hinge, (i.e. one thick washer on the left of the bearing, one thin on the right) which provides a bit more thread past the nut but still very little. A thin washer on either side of the bearing seems best for the bolt length, but then the hinge looks a little out of alignment.
Any suggestions from those who have already done this successfully?
Thanks!
I've contacted tech support, who advised that it should be Bolt > Thin Washer > Hinge > Thick Washer > Bearing > Thick Washer > Hinge > Thin Washer > Nut on all 5 hinges. This seems wrong though. The outboard (wingtip) aileron bolt is a -7 whereas the others are all -6. Two thick washers in the centre positions mean there is no thread to protrude past the end of the locknut with the -6 bolts. In addition, looking at the left wing hinges from behind, it seems that there is a shim on the left side (only) of the hinges where they are riveted together. This suggests Hinge > Thick Washer > Bearing > Thin Washer > > Hinge, (i.e. one thick washer on the left of the bearing, one thin on the right) which provides a bit more thread past the nut but still very little. A thin washer on either side of the bearing seems best for the bolt length, but then the hinge looks a little out of alignment.
Any suggestions from those who have already done this successfully?
Thanks!