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It's surprising most rotor mast designs don't include a nested secondary nut and don't use lockwire. In Japan, motorcycle racing requires lockwire on almost ev
by sacnoradhq 3y ago
It's surprising most rotor mast designs don't include a nested secondary nut and don't use lockwire.
In Japan, motorcycle racing requires lockwire on almost everything. It's a shame helicopter safety engineering generally doesn't meet this basic standard. Although, in fairness, relying on a single spinny thing without an all operational envelope survival passive glide capability is itself inherently dangerous.
- dtgriscom 3y ago... maybe because lockwire wouldn't help in this situation?
- MarkMarine 3y agoThe Jesus nut on a Huey and a cobra both include a secondary lock (looked like a single gear tooth) secured by a bolt and lock wire. The nut was torqued to 3000 ft-lb so this was kind of superfluous. But it does show that the nut was torqued, witnessed, and wired.
- bityard 3y agoLiterally the second sentence says that the the Jesus nut is secured by a retaining pin.