NTSB Identification: ANC95LA103.
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Nonscheduled 14 CFR
Accident occurred Thursday, July 13, 1995 in KETCHIKAN, AK
Probable Cause Approval Date: 02/14/1996
Aircraft: de Havilland DHC-3, registration: N472PM
Injuries: 8 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PILOT HAD JUST COMPLETED A CLIMBOUT AND WAS ADJUSTING THE TRIM FOR LEVEL FLIGHT, WHEN THE AIRPLANE BEGAN VIBRATING. HE LANDED IMMEDIATELY. EXAMINATION SHOWED THAT A PORTION OF THE ELEVATOR SERVO TAB HAD SEPARATED. EXAMINATION OF THE REMAINING SECTION OF THE SERVO TAB SHOWED THAT THERE WERE CRACKS IN THE TRAILING EDGE. THE DIRECTOR OF MAINTENANCE REPORTED THAT WHEN THE AIRCRAFT WAS PARKED, THE TAIL WAS ABOUT 10 TO 11 FEET ABOVE THE GROUND AND WOULD HAVE BEEN DIFFICULT TO INSPECT DURING PREFLIGHT.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

THE CRACKS IN THE TRAILING EDGE OF THE ELEVATOR SERVO TAB, WHICH RESULTED IN ITS SUBSEQUENT FAILURE AND PARTIAL SEPARATION.

Full narrative available

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