Nuts

Inspection after aircraft received from paint shop found left elevator actuating rod nut unpinned and backed off almost completely, with its bolt backing out. Left aileron outboard hinge was not attached. Hinge plate pinched between skin. Aileron binding. This aircraft was flown in this condition.

Editorial Staff

Friday, March 10, 2017 at 12:00 AM ET

Verified

Key Takeaways:

Multiple incidents involved critical nuts being loose, missing, or failing, often due to vibration, inadequate locking mechanisms, or post-maintenance oversights.
These failures led to severe safety hazards, including critical flight control issues, engine malfunctions, and inflight emergencies with oil leaks and smoke.
The recurring issues highlight the critical importance of meticulous inspection, proper installation, and the consistent use of robust locking features for threaded fasteners in aircraft maintenance and design.

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Beechcraft Model 58 Baron
Elevator Actuating Rod Nut

Cessna 182S Skylane
Loose Ground Power Connector

During scheduled inspection, a technician attempted to connect external power and found the top small control pin laying in bottom of receptacle. Attaching nut was found in the bottom of the relay box, and the wire was floating loose in box. Apparently, the nut backed off due to possible vibration. Reinstalled pin with new lock washer.
Part total time: 2368.0 hours