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.
In Case You Missed It
Lancair Evolution
When Joe Bartels bought the company from founder Lance Neibauer in 2003, he knew it was time for a change. The goal was to find a high-performance aircraft that could be flown by the average pilot in the target market. The solution can be found in the company's newest product, the Pratt & Whitney-powered turbine Evolution; by Doug Rozendaal.
Buying Trouble-Purchased Homebuilt Accident Rates
Up to half the homebuilt fleet is owned by non-builders.
Building Before Kits
Ray Allen reminisces about building a Midget Mustang from scratch. By Ray Allen.
Loctite and safety wire , I have yet to have one come loose