Crash-aerien 19 MAY 2007 d'un Beechcraft B99 Airliner N950AA - Billings-Logan Field, MT (BIL)
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Statuts:Accident investigation report completed and information captured
Date:samedi 19 mai 2007
Type/Sous-type:Silhouette image of generic BE99 model; specific model in this crash may look slightly different
Beechcraft B99 Airliner
Compagnie:Alpine Aviation
Immatriculation: N950AA
Numéro de série: U-159
Année de Fabrication: 1974
Heures de vol:34613
Equipage:victimes: 0 / à bord: 1
Passagers:victimes: 0 / à bord: 0
Total:victimes: 0 / à bord: 1
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Billings-Logan Field, MT (BIL) (   Etats-Unis d'Amérique)
Phase de vol: A l'atterrissage (LDG)
Aéroport de départ:Billings-Logan Field, MT (BIL/KBIL), Etats-Unis d'Amérique
Aéroport de destination:Kalispell-Glacier Park International Airport, MT (FCA/KGPI), Etats-Unis d'Amérique
A Beechcraft B99, N950AA, was substantially damaged when the nose wheel landing gear collapsed during landing roll at Billings Logan International Airport (BIL), Montana, USA. The pilot, the sole occupant in the airplane, was not injured. The pilot was flying on an activated instrument flight rules (IFR) flight plan, which had an intended destination of Kalispell, Montana.
The pilot said that he had departed from Billings, Montana, and had climbed to 12,000 feet. About 40 nautical miles northwest of Billings, he heard a "clunk" and the red unsafe light in the gear handle came on. He verified that all systems were functioning normally, and he cycled the landing gear up and down to see if that would solve the problem. The unsafe light remained illuminated. The pilot returned to Billings and circled for several hours to burn his fuel load down. He said that at one point he flew low over the runway so the company mechanic, with the aid of a light from an airport vehicle, could visually check the nose gear position. It was hanging out of the wheel well at approximately a 45-degree angle. Upon landing at Billings, the airplane settled to its nose during landing rollout.
Examination of the airplane by an FAA inspector revealed that the nose gear actuator mount bracket area was bent and wrinkled. The nose gear actuator shaft had fractured just above the clevis bolt, which attaches to the drag brace. The failed actuator had been installed on July 26, 2006. The Beech B99 maintenance manual states that the hydraulic actuator needs to be overhauled or replaced every 10,000 hours; maintenance records indicate that this one had 231.4 hours on it at the time of the accident. Metallurgists from both the National Transportation Safety Board and Hawker Beechcraft Corporation examined the failed actuator. Both concluded that all of the fractures were overstress, and no preexisting fatigue signatures were evident.

Probable Cause:

PROBABLE CAUSE: "The total failure of the nose landing gear actuator and the subsequent nose gear collapse during landing."

Accident investigation:

Investigating agency: NTSB
Status: Investigation completed
Duration: 285 days (10 months)
Accident number: SEA07LA133
Download report: Summary report

» NTSB id 20070703X00870


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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 Billings-Logan Field, MT et Kalispell-Glacier Park International Airport, MT est de 511 km (319 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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