METLAKATLA, AK, USA
N13GA
DE HAVILLAND DHC-3
WHILE ON FINAL APPROACH FOR LANDING, THE PILOT REPORTED THAT THE AIRPLANE'S CONTROL YOKE STARTED VIBRATING AND THE NOSE OF THE AIRPLANE PITCHED DOWN. THE PILOT CORRECTED BY RE-TRIMMING THE AIRPLANE AND LANDED WITHOUT FURTHER INCIDENT. POST-ACCIDENT INSPECTION REVEALED THAT THE RIVETS ATTACHING THE TRIM TAB CONTROL HORN TO THE RIGHT ELEVATOR TRIM TAB HAD PULLED OUT, ALLOWING THE TRIM TAB AND ELEVATOR TO FLUTTER.
TOTAL FAILURE OF THE RIVETS ATTACHING THE TRIM TAB CONTROL HORN TO THE RIGHT ELEVATOR TRIM TAB.
Source: NTSB Aviation Accident Database
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