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 reveal critical issues with loose, missing, or failed nuts on essential aircraft components, ranging from control linkages and electrical connectors to engine parts and turbochargers.
These fastener deficiencies led to significant operational problems, including control surface binding, critical oil leaks with in-flight emergencies, and severe engine damage.
Root causes identified include improper installation post-maintenance, vibration-induced loosening, material fatigue, and a lack of adequate or effective locking mechanisms on critical fasteners.

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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