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Last updated: 5 December 2021
Statuts:Enquête Officielle
Date:samedi 17 octobre 1998
Type/Sous-type:Silhouette image of generic BE99 model; specific model in this crash may look slightly different
Beechcraft 99 Airliner
Compagnie:Alpine Aviation
Immatriculation: N299GL
Numéro de série: U-102
Année de Fabrication: 1969
Heures de vol:39685
Moteurs: 2 Pratt & Whitney Canada PT6A-28
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:Missoula-Johnson-Bell Field, MT (MSO) (   Etats-Unis d'Amérique)
Phase de vol: En approche (APR)
Aéroport de départ:Billings-Logan International Airport, MT (BIL/KBIL), Etats-Unis d'Amérique
Aéroport de destination:Missoula-Johnson-Bell Field, MT (MSO/KMSO), Etats-Unis d'Amérique
Numéro de vol:5010
The aircraft had completed a flight from Billings, MT when the co-pilot started a visual approach to runway 29. He initiated the flare too high above the runway, and as the aircraft floated toward the departure end of the runway, the airspeed began to decrease. As the airspeed decreased and the aircraft began to sink, the pilot-in-command called for the co-pilot to add power, which he did. The aircraft then was about to stall, causing the pilot-in-command to take control and initiate a go-around. Control was difficult due to a full nose-up trim. During the attempted go-around, the pilot-in-command called for the flaps to be raised, but the co-pilot first pushed the throttles forward to maximum power as called for in the B-99 Pilots Operating Manual rejected landing checklist before initiating flap retraction. The aircraft then descended into the dirt surface adjacent to the runway.
The co-pilot began his training with the operator about three weeks prior to the accident. At that time, he had accumulated approximately 215 hours of flying time, none of which was in the Beech 99 or other turbo-prop powered aircraft. During his training program, he accumulated 10.6 additional hours, none of which was at night.

Probable Cause:

PROBABLE CAUSE: "The pilot-in-command's delayed remedial action in response to the co-pilot's improper landing flare, and the co-pilot's application of excessive (full nose-up) trim during the landing flare as taught in the operator's initial aircrew training program. Factors include the co-pilot's improper flare and his lack of total experience in this type of aircraft".

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years
Accident number: SEA99LA003
Download report: Summary report

» Scramble 235


photo of Beechcraft-99-N299GL
accident date: 17-10-1998
type: Beechcraft 99
registration: N299GL

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 International Airport, MT et Missoula-Johnson-Bell Field, MT est de 440 km (275 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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