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Statuts:Enquête Officielle
Date:mardi 25 novembre 1997
Heure:08:13
Type/Sous-type:Silhouette image of generic SH36 model; specific model in this crash may look slightly different
Shorts 360-100
Compagnie:Corporate Air
Immatriculation: N691A
Numéro de série: SH.3618
Année de Fabrication: 1983-08-03 (14 years 4 months)
Equipage:victimes: 0 / à bord: 2
Passagers:victimes: 0 / à bord: 0
Total:victimes: 0 / à bord: 2
Dégats de l'appareil: Substantiels
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Billings-Logan International Airport, MT (BIL) (   Etats-Unis d'Amérique)
Phase de vol: A l'atterrissage (LDG)
Nature:Cargo
Aéroport de départ:Great Falls International Airport, MT (GTF/KGTF), Etats-Unis d'Amérique
Aéroport de destination:Billings-Logan International Airport, MT (BIL/KBIL), Etats-Unis d'Amérique
Détails:
A Short 360, N691A, operated by Corporate Air, was substantially damaged when the left main landing gear collapsed on landing at the Billings-Logan International Airport, MT (BIL). Both pilots were uninjured. Instrument meteorological conditions existed at the time, and an IFR flight plan was in effect. The flight, which was an unscheduled, domestic cargo flight from Great Falls International Airport, MT (GTF) departed approximately 07:15.
The cargo flight was being vectored for the VOR/DME RWY 28R approach to Billings during instrument meteorological conditions. Weather conditions one minute before the accident were winds 020 at 13 knots, light snow and mist, and visibility was deteriorating rapidly. The co-pilot was flying the aircraft, and the PIC was handling radio communications. At 08:12, having crossed the final approach fix, the aircraft descended through 100 feet above the MDA (3,940 feet or 426 feet above the runway threshold), and immediately thereafter the crew visually acquired the runway. At 08:13 the aircraft's GPWS alert of 'SINK RATE' was heard, followed 2 seconds later by the PIC calling for 'POWER,' and a 2 second delay to ground impact. The co-pilot had logged a total of 103 hours in the Shorts 360 all within the previous 90 days, while the PIC had just begun flying the aircraft in Montana's late fall weather after a 6 year assignment flying in the Hawaiian islands. The left main landing gear collapsed in overload during the ground impact.

Probable Cause:

PROBABLE CAUSE: "The co-pilot's failure to maintain the proper descent rate on final approach, the pilot-in-command's delayed remedial action, and overload of the left main landing gear assembly. Factors contributing were snow, crosswind conditions and deteriorating visibility."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 10 months
Accident number: SEA98LA016
Download report: Summary report
Language: English

Sources:
» NTSB


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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 Great Falls International Airport, MT et Billings-Logan International Airport, MT est de 283 km (177 miles).

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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