Improper Bolt Length



A bolt should extend beyond the nut by 1–3 threads. If it is any longer, then the next size shorter bolt should be used. This bolt attaches the autopilot servo arm to the aileron, a pretty important connection. In this case either a longer bolt should be used, or at a minimum remove the AN960-10 washer, which is really not needed in this application. 


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Vic Syracuse
Vic is a fixed-wing and helicopter commercial pilot, CFII with ASMEL/ASES ratings, an A&P/IA, DAR, and EAA technical advisor and flight counselor. Passionately involved in aviation for over 40 years, he has built 11 aircraft and logged over 10,000 hours in 72 different kinds of aircraft. Vic volunteers as a Young Eagle pilot, has his own sport aviation business called Base Leg Aviation, and has written two books on aircraft prebuy and condition inspections.


  1. I would have liked to have heard the results of the same experiment torque ing the nut bolt only when using a nut bolt with with ribs round the outside of it.Torqued dry and with apoxy. I can’t see why the guy complained so much.I found it to be a unique tool.Not terribly expensive.You just have to realize it’s not a fix all.And you have to admit,. It was a clever idea who ever invented the tool.Personally ,I love mine !


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