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Accident description
Last updated: 19 October 2017
Status:Final
Date:Thursday 27 November 2008
Time:15:15
Type:Silhouette image of generic JS31 model; specific model in this crash may look slightly different
British Aerospace 3112 Jetstream 31
Operator:Northwestern Air
Registration: C-FNAY
C/n / msn: 768
First flight: 1987
Engines: 2 Garrett TPE331-10UG-514H
Crew:Fatalities: 0 / Occupants: 2
Passengers:Fatalities: 0 / Occupants: 3
Total:Fatalities: 0 / Occupants: 5
Airplane damage: Substantial
Airplane fate: Written off (damaged beyond repair)
Location:Fort Smith Airport, NT (YSM) (   Canada)
Phase: Landing (LDG)
Nature:Domestic Scheduled Passenger
Departure airport:Hay River Airport, NT (YHY/CYHY), Canada
Destination airport:Fort Smith Airport, NT (YSM/CYSM), Canada
Flightnumber: 734
Narrative:
The Northwestern Air BAe Jetstream 3112 (registration C-FNAY) was operating as flight PLR734 on an instrument flight rules (IFR) flight from Hay River Airport, NT (YHY) to Fort Smith Airport, NT (YSM). After conducting an IFR approach to runway 11, PLR 734 executed a missed approach and flew a full procedure approach for runway 29. At approximately 0.2 nautical miles from the threshold, the crew sighted the approach strobe lights and continued for a landing. Prior to touchdown, the aircraft entered an aerodynamic stall and landed hard on the runway. The aircraft remained on the runway despite the left main landing gear collapsing. The two flight crew members and three passengers were uninjured and evacuated the aircraft through the left main cabin door. There was no post-impact fire.

Probable Cause:

FINDINGS AS TO CAUSES AND CONTRIBUTING FACTORS:
1. Though icing conditions were encountered, the airframe de-icing boots were not cycled nor was the Vref speed increased to offset the effects of aircraft icing.
2. An abrupt change in aircraft configuration, which included a reduction in power to flight idle and the addition of 35º flap, caused the aircraft's speed to rapidly decrease.
3. The aircraft entered an aerodynamic stall due to the decreased performance caused by the icing. There was insufficient altitude to recover the aircraft prior to impact with the runway.

Accident investigation:
cover
Investigating agency: TSB Canada
Status: Investigation completed
Duration: 153 days (5 months)
Accident number: A08W0237
Download report: Final report

Classification:
Icing

Sources:
» CADORS Number: 2008C4178


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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 Hay River Airport, NT to Fort Smith Airport, NT as the crow flies is 227 km (142 miles).
Accident location: Exact; deduced from official accident report.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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