Incident de Havilland Canada DHC-8-102 N852MA, Wednesday 22 January 1997
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Date:Wednesday 22 January 1997
Type:Silhouette image of generic DH8A model; specific model in this crash may look slightly different    
de Havilland Canada DHC-8-102
Owner/operator:Mesaba Aviation
Registration: N852MA
MSN: 349
Year of manufacture:1992
Total airframe hrs:9665 hours
Engine model:P&W PW120A
Fatalities:Fatalities: 0 / Occupants: 11
Other fatalities:0
Aircraft damage: None
Location:Charleston-Yeager Airport, WV (KCRW) -   United States of America
Phase: Take off
Nature:Passenger - Scheduled
Departure airport:Charleston-Yeager Airport, WV (KCRW)
Destination airport:Roanoke, VA (ROA)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The captain said that during takeoff rotation, the airplane rolled left. He noted no warning lights or horns before or during the event. He applied right control wheel and right rudder to stop the left roll. After the captain had the airplane's roll stabilized, he 'made a wide left pattern and returned to the departure airport.' The airplane was landed without further incident. A postincident inspection of the airplane revealed that the left inboard roll spoiler was 'jammed and partially deployed.' An examination and disassembly of the roll spoiler servoactuator revealed that a plug (PN A50993-1), which had been fusion-welded into the base of the piston (PN A50992-1), had separated and lodged between the base of the piston and the shims, restricting the piston's movement. Dowty Aerospace (the manufacturer) had recorded six previous failures of fusion welds in pistons on DHC-8 roll spoiler servoactuators before this incident.

Probable Cause: a fractured fusion weld in the piston of the roll spoiler servoactuator, which allowed the plug at the base of the piston to separate and jam the piston. A factor relating to the incident was: the inadequate design of the airplane's roll spoiler servoactuator piston.

Accident investigation:
Investigating agency: NTSB
Report number: CHI97IA075
Status: Investigation completed
Download report: Final report



Revision history:

03-Nov-2018 20:56 ASN Update Bot Added

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