Quote:
Originally Posted by rotorwrench
This has nothing to do with the model As but it is food for thought. Helicopters are currently required to have two locking features on all control system linkage hardware. Many use a locking castle nut with a cotter pin and some use a locking nut with safety wire. The Robinson types used steel locking nuts with a pall nut. That always reminds me of my late Mercury 8CM flatheads V8s that used a pall nut on the connecting rod bolts. They likely didn't need them but I always put them back on there during an overhaul.
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On Kingairs, the trim tab actuator have four levels of locking, and two actuator rods connecting the trim tab. A double clevis, with one inside the other that is made offset by a locknut pushing the outer clevis only. The clevis bolt can't be removed without twisting the actuator rod to get the head past the other bolt head, they are inserted with heads towards each other and nuts away from the centre of the control. Then a nyloc castle nut with a spilt pin. This was also checked by two licensed airframe technicians.