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Last updated: 8 December 2021
Statuts:Enquête Officielle
Date:vendredi 29 décembre 2006
Heure:02:00
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: N99TH
Numéro de série: U-155
Année de Fabrication: 1974
Heures de vol:39795
Moteurs: 2 Pratt & Whitney Canada PT6A-27
Equipage:victimes: 0 / à bord: 1
Passagers:victimes: 0 / à bord: 0
Total:victimes: 0 / à bord: 1
Dégats de l'appareil: Substantiels
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:16 km (10 milles) S of Rapid City Regional Airport, SD (RAP) (   Etats-Unis d'Amérique)
Phase de vol: En approche (APR)
Nature:Cargo
Aéroport de départ:Pierre Airport, SD (PIR/KPIR), Etats-Unis d'Amérique
Aéroport de destination:Rapid City Regional Airport, SD (RAP/KRAP), Etats-Unis d'Amérique
Numéro de vol: 408
Détails:
The airplane was on an instrument flight rules flight in night instrument meteorological conditions when the accident occurred. The airplane had been cleared for an ILS approach and the pilot elected to use a non-published procedure to intercept the final approach. After becoming established on the final approach, the airplane impacted the ground about 7 miles from the destination airport at an elevation approximately the same as the airport elevation.
Post accident examination of the altimeters revealed that the number one altimeter read 360 feet high. No determination was made as to whether the discrepancy existed prior to impact. However, the pilot did not report any pre-flight discrepancies with regard to the airplane's altimeters.

Probable Cause:

PROBABLE CAUSE: "The pilot's failure to follow the published instrument approach procedure which contributed to his failure to maintain altitude and clearance from terrain during the instrument approach. A factor was the night light condition."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 3 months
Accident number: CHI07LA050
Download report: Summary report

Sources:
» NTSB Identification: CHI07LA050


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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 Pierre Airport, SD et Rapid City Regional Airport, SD est de 222 km (139 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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