NTSB Identification: CHI95IA066.
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Scheduled 14 CFR
Incident occurred Thursday, January 12, 1995 in WILLISTON, ND
Probable Cause Approval Date: 08/31/1995
Aircraft: BEECH 1900D, registration: N118UX
Injuries: 6 Uninjured.
NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.
DURING AN INSTRUMENT DESCENT FROM CRUISE, THE ELEVATOR TRIM CABLE FAILED. THE CREW EXPERIENCED INCREASING NOSE DOWN PITCH REGARDLESS OF INPUT. A SAFE LANDING WAS ACCOMPLISHED BY BOTH PILOTS PULLING AFT ON THE YOKE TO OVERCOME PRESSURE, AND LOWERING FLAPS AND LANDING GEAR 50 AND 20 KNOTS ABOVE THEIR RESPECTIVE OPERATING SPEEDS TO REDUCE THE TRIM FORCES AND HELP SLOW THE AIRPLANE. INSPECTION REVEALED THAT THE TRIM CABLE HAD BEEN INCORRECTLY ROUTED AROUND A CABLE GUIDE DURING INITIAL PRODUCTION, AND HAD NOT REACHED THE FIRST REQUIRED INSPECTION WHICH WOULD HAVE ALLOWED THE DISCREPANCY TO BE DISCOVERED.
The National Transportation Safety Board determines the probable cause(s) of this incident to be: the improper installation and inadequate quality assurance inspection of the elevator trim cable during original manufacture, which resulted in fraying and failure of the cable prior to the first routine scheduled inspection of the system. Full narrative available
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