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!
Help requested - wing hinge washers
Re: Help requested - wing hinge washers
I used a different length and used this EAA guide below... AC43 has good info as well
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Basics of Bolt Installation
Certain accepted practices prevail concerning the installation of hardware. A few of these regarding bolt installation follow:
In determining proper bolt length - no more than one thread should be hidden inside the bolt hole.
Whenever possible, bolts should be installed pointing aft and to the center of an airplane.
Use a torque wrench whenever possible and determine torque values based on the size of bolt.
Be sure bolt and nut threads are clean and dry.
Use smooth, even pulls when tightening.
Tighten the nut first - whenever possible.
A typical installation includes a bolt, one washer and a nut.
If the bolt is too long, a maximum of three washers may be used.
If more than three threads are protruding from the nut, the bolt may be too long and could be bottoming out on the shank.
Use undrilled bolts with fiber lock nuts. If you use a drilled bolt and fiber nut combination, be sure no burrs exist on the drilled hole that will cut the fiber.
If the bolt does not fit snugly consider the use of a close tolerance bolt.
Don't make a practice of cutting off a bolt that is too long to fit a hole. That can often weaken the bolt and allow corrosion in the area that is cut.
Aircraft Nuts
Aircraft nuts usually have no identification on them but they are made from the same material as bolts. Due to the vibration of aircraft, nuts must have some form of a locking device to keep them in place. The most common ways of locking are cotter pins used in castle nuts, fiber inserts, lockwashers, and safety wire. The aircraft nuts you will most likely encounter are castle nuts, self-locking nuts, and plain nuts. Wing nuts and anchor nuts are also used.
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Basics of Bolt Installation
Certain accepted practices prevail concerning the installation of hardware. A few of these regarding bolt installation follow:
In determining proper bolt length - no more than one thread should be hidden inside the bolt hole.
Whenever possible, bolts should be installed pointing aft and to the center of an airplane.
Use a torque wrench whenever possible and determine torque values based on the size of bolt.
Be sure bolt and nut threads are clean and dry.
Use smooth, even pulls when tightening.
Tighten the nut first - whenever possible.
A typical installation includes a bolt, one washer and a nut.
If the bolt is too long, a maximum of three washers may be used.
If more than three threads are protruding from the nut, the bolt may be too long and could be bottoming out on the shank.
Use undrilled bolts with fiber lock nuts. If you use a drilled bolt and fiber nut combination, be sure no burrs exist on the drilled hole that will cut the fiber.
If the bolt does not fit snugly consider the use of a close tolerance bolt.
Don't make a practice of cutting off a bolt that is too long to fit a hole. That can often weaken the bolt and allow corrosion in the area that is cut.
Aircraft Nuts
Aircraft nuts usually have no identification on them but they are made from the same material as bolts. Due to the vibration of aircraft, nuts must have some form of a locking device to keep them in place. The most common ways of locking are cotter pins used in castle nuts, fiber inserts, lockwashers, and safety wire. The aircraft nuts you will most likely encounter are castle nuts, self-locking nuts, and plain nuts. Wing nuts and anchor nuts are also used.
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