Détails:
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.
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.
| Statuts: | Accident investigation report completed and information captured |
| Date: | jeudi 27 novembre 2008 |
| Heure: | 15:15 |
| Type/Sous-type: |  British Aerospace 3112 Jetstream 31 |
| Compagnie: | Northwestern Air |
| Immatriculation: | C-FNAY |
| Numéro de série: | 768 |
| Année de Fabrication: | 1987 |
| Moteurs: | 2 Garrett TPE331-10UG-514H |
| Equipage: | victimes: 0 / à bord: 2 |
| Passagers: | victimes: 0 / à bord: 3 |
| Total: | victimes: 0 / à bord: 5 |
| Dégats de l'appareil: | Substantiels |
| Conséquences: | Written off (damaged beyond repair) |
| Lieu de l'accident: | Fort Smith Airport, NT (YSM) ( Canada)
|
| Phase de vol: | A l'atterrissage (LDG) |
| Nature: | Transport de Passagers Nat. |
| Aéroport de départ: | Hay River Airport, NT (YHY/CYHY), Canada |
| Fort Smith Airport, NT (YSM/CYSM), Canada | |
| Numéro de vol: | 734 |
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:
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Sources:
» CADORS Number: 2008C4178Photos
Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Hay River Airport, NT et Fort Smith Airport, NT est de 227 km (142 miles).
Accident location: Exact; deduced from official accident report.
La distance entre Hay River Airport, NT et Fort Smith Airport, NT est de 227 km (142 miles).
Accident location: Exact; deduced from official accident report.
Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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