Accident
Last updated: 20 August 2014
Statuts:Enquête Officielle
Date:mardi 9 janvier 2007
Heure:11:33
Type/Sous-type:Silhouette image of generic JS31 model; specific model in this crash may look slightly different
British Aerospace 3112 Jetstream 31
Compagnie:Peace Air
Immatriculation: C-FBIP
Numéro de série: 820
Année de Fabrication: 1988
Moteurs: 2 Garrett TPE331-10UG-513H
Equipage:victimes: 0 / à bord: 2
Passagers:victimes: 0 / à bord: 10
Total:victimes: 0 / à bord: 12
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Fort St. John Airport, BC (YXJ) (   Canada) show on map
Phase de vol: A l'atterrissage (LDG)
Nature:Transport de Passagers Nat.
Aéroport de départ:Grande Prairie Airport, AB (YQU/CYQU), Canada
Aéroport de destination:Fort St. John Airport, BC (YXJ/CYXJ), Canada
Numéro de vol: 905
Détails:
Peace Air Ltd. Flight PE905 departed Grande Prairie (CYQU) at 10:40 MST on the first leg of a scheduled run to Fort St. John (CYXJ), Fort Nelson, BC, and Grande Prairie.
Air traffic control (ATC) cleared the flight to maintain 12 000 feet above sea level (asl), and to hold on the TAYLOR non directional beacon (NDB), which forms the final approach fix for the instrument landing system (ILS) approach to runway 29 at St. John. At 11:09, Flight PE905 was cleared for an ILS approach to runway 29. The first approach was discontinued due to the aircraft being too high on the final approach leg, and clearance was given to return to the TAYLOR NDB at 6000 feet. At 11:23, ATC cleared the flight for another ILS approach to runway 29. The second approach was conducted as a full procedure with the outbound leg extended to ensure that the aircraft was positioned to follow the correct vertical approach profile.
The final approach course was flown with a flap setting of 20º and at the company standard operating procedure (SOP) recommended airspeed of 130 knots. At approximately 300 feet above ground level, the first officer informed the captain that he had the ground in sight. The approach lights were visual shortly thereafter. The captain discontinued his instrument scan and confirmed the appearance of the approach lights. The captain made the decision to land, and called for the full flap setting of 35º. The first officer diverted his attention to setting flaps, and to the Vref reference cards clipped to the instrument panel. When he looked up, the aircraft was almost on the ground, but short of the runway. There was insufficient time to warn the captain.
The aircraft initially touched down in a nearly wings-level attitude, 320 feet short of the threshold in about 16 inches of packed snow. The left main gear contacted the surface first, followed by the right main gear, and then the nose wheel. The aircraft then struck the last set of approach lights, bounced slightly, and touched down again 180 feet short of the threshold. After sliding through the threshold lights, the aircraft came to rest on the right edge of the runway, 380 feet beyond the threshold. The right main gear had broken off, and the nose gear had collapsed rearward. Both propellers were damaged by ground contact. The aircraft was equipped with a belly-mounted cargo pod, which supported the fuselage during impact.


FINDINGS AS TO CAUSES AND CONTRIBUTING FACTORS:
1. A late full flap selection at 300 feet above ground level (agl) likely destabilized the aircraft's pitch attitude, descent rate and speed in the critical final stage of the precision approach, resulting in an increased descent rate before reaching the runway threshold.
2. After the approach lights were sighted at low altitude, both pilots discontinued monitoring of instruments including the glide slope indicator. A significant deviation below the optimum glide slope in low visibility went unnoticed by the crew until the aircraft descended into the approach lights.
FINDING AS TO RISK:
1. The crew rounded the decision height (DH) figure for the instrument landing system (ILS) approach downward, and did not apply a cold temperature correction factor. The combined error could have resulted in a descent of 74 feet below the DH on an ILS approach to minimums, with a risk of undershoot.
OTHER FINDING:
1. The cockpit voice recorder (CVR) was returned to service following an intelligibility test that indicated that the first officer's hot boom microphone intercom channel did not record. Although the first officer voice was recorded by other means, a potential existed for loss of information, which was key to the investigation.

Sources:
» TSB

Official accident investigation report
investigating agency: Transportation Safety Board (TSB) - Canada
report status: Final
report number: TSB Report A07W0005
report released:02-OCT-2007
duration of investigation:266 days (8.9 months)
download report: Aviation Investigation Report Landing Short of Runway Peace Air Ltd. British Aerospace Jetstream 3112 C-FBIP Fort St. John, British Columbia 09 January 2007 (TSB Report A07W0005)
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Photos

photo of British Aerospace 3112 Jetstream 31 C-FBIP
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Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Grande Prairie Airport, AB et Fort St. John Airport, BC est de 164 km (103 miles).

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