Jam nuts serve a purpose and that is to prevent actuating arms from becoming disconnected. I found three examples on the same airplane. Two flap jam nuts were loose and should have been caught on a preflight, and the autopilot servo arm jam nut was loose as well. Any of these could cause a flight control problem if they came completely loose.
![[Credit: ChatGPT]](https://www.kitplanes.com/wp-content/uploads/2026/07/What-did-you-miss-Topaz-Gigapixel-4x-scale.jpg?w=218&h=150&crop=1 "Last Bits"){kind=tracking}
![[Credit: Wikimedia Commons]](https://www.kitplanes.com/wp-content/uploads/2026/07/4_rutan_a_longez.jpg_preview.jpg?w=218&h=150&crop=1 "Rutan Symposium Turns to the Coming Canard Maintenance Crisis")
![[Credit: Lisa Turner]](https://www.kitplanes.com/wp-content/uploads/2026/04/Inspections-1-scaled.jpg?w=218&h=150&crop=1 "Last Bits")
![[Credit: Lisa Turner]](https://www.kitplanes.com/wp-content/uploads/2026/02/Fuel-Selector.jpg?w=218&h=150&crop=1 "Fuel Follies")
![[Credit: Eric Powell]](https://www.kitplanes.com/wp-content/uploads/2026/02/AdobeStock_1043661239-scaled.jpeg?w=218&h=150&crop=1 "Weight In The Balance")
Loctite and safety wire , I have yet to have one come loose
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