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
Cover Story: Designing Men
In this first installment of the upholstery series, the author looks at the basics: sewing machines, scissors, needles and thread, and more.
Love at First Sight
John Lake’s lifelong passion for the Marquart Charger.
The Ins and Outs of Pre-buys
Dont buy a used Experimental aircraft without one (Part 2).
Loctite and safety wire , I have yet to have one come loose