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Last updated: 21 September 2021
Statuts:Enquête Officielle
Date:jeudi 19 janvier 2017
Heure:11:44
Type/Sous-type:Silhouette image of generic BE99 model; specific model in this crash may look slightly different
Beechcraft 99A Airliner
Compagnie:Alpine Aviation
Immatriculation: N326CA
Numéro de série: U-135
Année de Fabrication: 1970
Heures de vol:46422
Moteurs: 2 Pratt & Whitney Canada PT6A-28
Equipage:victimes: 0 / à bord: 1
Passagers:victimes: 0 / à bord: 0
Total:victimes: 0 / à bord: 1
Dégats de l'appareil: Substantiels
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:Glendive-Dawson Community Airport, MT (GDV/KGDV), Etats-Unis d'Amérique
Aéroport de destination:Sidney-Richland Municipal Airport, MT (SDY/KSDY), Etats-Unis d'Amérique
Numéro de vol:1530
Détails:
A Beechcraft 99, N326CA, experienced a landing gear collapse while landing at the Billings Logan International Airport, Montana, USA. The commercial pilot, the sole occupant, was not injured; the airplane sustained substantial damage. The cargo transport flight departed from Glendive-Dawson Community Airport, Montana about 09:45 with a planned destination of Sidney-Richland Municipal Airport, Montana.
The pilot reported that after departure, he retracted the landing gear and heard a "thud" sound. The landing gear "unsafe" light was illuminated and the left landing gear light remained illuminated green, an indication that it was still extended despite the landing gear handle being in the retracted position. When reaching his initial destination of Sidney, the pilot performed a low pass over the runway to enable maintenance personnel on the ground do a visual assessment. A mechanic stated that the nose gear was extended. The pilot diverted to Billings and the air traffic control personnel confirmed observing the nose gear extended at a 45-degree angle.
The pilot further stated that he aligned with runway 28R and just prior to touch down, he feathered the propellers and decreased the airspeed. During touchdown, the right gear collapsed and the airplane came to rest on the centerline. As a result of the impact, the right aileron and right wing spar sustained damage.

Probable Cause:

Probable cause: "The fatigue failure of the left main landing gear (MLG) actuator piston rod, which prevented the hydraulic system from producing pressure to control the MLG's position and led to the right MLG collapsing during landing."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 3 years and 3 months
Accident number: WPR17LA056
Download report: Summary report

Sources:
» FAA
» Billings Gazette
» NTSB

METAR Weather report:
17:53 UTC / 10:53 local time:
KBIL 191753Z 23012KT 10SM SCT100 SCT160 03/M06 A2952 RMK AO2 SLP013 ACSL DSNT SE-S 4/004 933003 T00331056 10033 20000 50003

18:53 UTC / 11:53 local time:
KBIL 191853Z 23012KT 10SM BKN100 BKN160 04/M06 A2949 RMK AO2 SLP002 ACSL NE DSNT SE-S T00441056


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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 Glendive-Dawson Community Airport, MT et Sidney-Richland Municipal Airport, MT est de 78 km (49 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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