Accident Beechcraft 99A Airliner C-FDYF,
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Date:Wednesday 23 April 2003
Type:Silhouette image of generic BE99 model; specific model in this crash may look slightly different    
Beechcraft 99A Airliner
Owner/operator:Transwest Air
Registration: C-FDYF
MSN: U-110
Year of manufacture:1969
Engine model:Pratt & Whitney Canada PT6A-27
Fatalities:Fatalities: 0 / Occupants: 6
Aircraft damage: Destroyed, written off
Location:11 km from Prince Albert, SK -   Canada
Phase: Approach
Nature:Passenger - Scheduled
Departure airport:Saskatoon Airport, SK (YXE/CYXE)
Destination airport:Prince Albert Airport, SK (YPA/CYPA)
Investigating agency: TSB
Confidence Rating: Accident investigation report completed and information captured
The aircraft was approximately 4000 feet asl when the crew selected the flaps for the approach to Prince Albert. A bang was heard from the rear of the fuselage. The aircraft commenced an uncommanded pitch-up to a near-vertical attitude, then stalled, nosed over, and began a spin to the left. The crew countered the spin but the aircraft continued to descend in a near-vertical dive. Through the application of full-up elevator and the manipulation of power settings, the pilots were able to bring the aircraft to a near-horizontal attitude. The crew extended the landing gear and issued a Mayday call, indicating that they were conducting a forced landing. The aircraft struck a knoll, tearing away the belly cargo pod and the landing gear. The aircraft bounced into the air and travelled approximately 180 metres, then contacted a barbed-wire fence and slid to a stop approximately 600 metres from the initial impact point.

1. During flight, the horizontal stabilizer trim actuator worked free of the mounting structure, and as a result, the flight crew lost pitch control of the aircraft.
2. During replacement of the horizontal stabilizer trim actuator, the upper attachment bolts were inserted through the airframe structure but did not pass through the upper mounting lugs of the trim actuator.
3. The improperly installed bolts trapped the actuator mounting lug assemblies, suspending the weight of the actuator and giving the false impression that the bolts had been correctly installed.
4. Dual inspections, ground testing, and flight testing did not reveal the faulty attachment.

Accident investigation:
Investigating agency: TSB
Report number: TSB Report A03C0094
Status: Investigation completed
Duration: 9 months
Download report: Final report




photo (c) Elliott Greenman, via Werner Fischdick; Hagerstown-Wash. County Regional Airport, MD (HGR); March 1978

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