Accident description
Last updated: 1 November 2014
Status:Final
Date:Monday 12 February 1979
Time:13:00
Type:Mohawk 298 (Nord 262)
Operator:Allegheny Airlines
Registration: N29824
C/n / msn: 48
First flight: 1968
Total airframe hrs:9140
Engines: 2 Pratt & Whitney Canada PT6A-45
Crew:Fatalities: 1 / Occupants: 3
Passengers:Fatalities: 1 / Occupants: 22
Total:Fatalities: 2 / Occupants: 25
Airplane damage: Damaged beyond repair
Location:Clarksburg-Benedum Airport, WV (CKB) (   United States of America) show on map
Phase: Initial climb (ICL)
Nature:Domestic Scheduled Passenger
Departure airport:Clarksburg-Benedum Airport, WV (CKB/KCKB), United States of America
Destination airport:Washington-National Airport, DC (DCA/KDCA), United States of America
Flightnumber: 561
Narrative:
At 11:16 Allegheny Flight 561 departed Clarksburg for a flight to Morgantown, WV but the pilot decided not to make an approach at Morgantown because the ILS glide slope was out of service, and the visibility was 1/2 mile. The flight returned to Clarksburg and landed at 11:46.
The aircraft was refueled and prepared for a rescheduled flight 561 to Washington-National Airport. The Nord 262 was de-iced between 12:20 and 12:35. When the crew taxied out at about 12:57 there was again some wet snow on all its horizontal surfaces.
Shortly after lift-off from runway 21 the aircraft rolled 45deg to the right, 45deg to the left and back to the right again until the wing struck the ground. The aircraft crashed and came to rest inverted.


PROBABLE CAUSE: "The captain's decision to take off with snow on the aircraft's wing and empennage surfaces which resulted in a loss of lateral control and a loss of lift as the aircraft ascended out of ground effect."

Classification:
Icing
Loss of control

Sources:
» NTSB Safety Recommendations A-80-112/114
» NTSB-AAR-79-12

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - United States of America
report status: Final
report number: NTSB/AAR-79-12
report released:16-AUG-1979
duration of investigation:185 days (6.2 months)
download report: Allegheny Airlines, Inc., Nord 262 Mohawk/Frakes 298, N29824-Benedum Airport, Clarksburg, West Virginia, February 12, 1979. (NTSB/AAR-79-12)
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Photos

photo of Mohawk 298 F-BSTN
F-BSTN moved to Lina Congo in 1975 before Allegheny bought the Nord in July 1977; conversion to Mohawk 298 was accomplished in October of the same year.
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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Clarksburg-Benedum Airport, WV to Washington-National Airport, DC as the crow flies is 278 km (174 miles).

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