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Accident
Last updated: 23 October 2017
Statuts:Enquête Officielle
Date:vendredi 5 avril 2002
Heure:08:45
Type/Sous-type:Silhouette image of generic DC3T model; specific model in this crash may look slightly different
Basler BT-67 Turbo 67 (DC-3T)
Compagnie:U.S. Forest Service
Immatriculation: N115Z
Numéro de série: 33567/16819
Année de Fabrication: 1945
Heures de vol:16433
Equipage:victimes: 0 / à bord: 2
Passagers:victimes: 0 / à bord: 1
Total:victimes: 0 / à bord: 3
Dégats de l'appareil: Substantiels
Conséquences: Repaired
Lieu de l'accident:Casper/Natrona County International Airport, WY (CPR) (   Etats-Unis d'Amérique)
Phase de vol: Au roulage (TXI)
Nature:Inconnu
Aéroport de départ:Casper/Natrona County International Airport, WY (CPR/KCPR), Etats-Unis d'Amérique
Aéroport de destination:Missoula-Johnson-Bell Field, MT (MSO/KMSO), Etats-Unis d'Amérique
Détails:
A Basler BT-67, N115Z, was substantially damaged when its left main landing gear collapsed while standing at Casper-Natrona County International Airport, Wyoming, USA. There were no injuries.
The pilot said that the airplane had taxied out for departure on runway 3. He said that he and his copilot were completing the checklist for departure when the copilot noticed high hydraulic pressure on the landing gear system. The copilot began the landing gear pressure relief procedure, but instead performed the landing gear retraction procedure. The pilot called out to the copilot to intervene, but the left main landing gear had already commenced retracting. The airplane settled onto its left wing damaging several intercostal ribs and wrinkling the left wing's skin.
The copilot said that he had taken two capsules of an over-the-counter Federal Aviation Administration non-approved medication (Benadryl Allergy) on the morning of the accident. This medication, known as Diphenhydramine, commonly results in drowsiness, and has measurable effects on performance of complex cognitive and motor tasks.

Probable Cause:

PROBABLE CAUSE: "The copilot's inadvertent retraction of the landing gear. A contributing factor was the use of inappropriate medication by the copilot."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 12 months
Accident number: DEN02TA037
Download report: Summary report

Sources:
» NTSB id 20020422X00567


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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 Casper/Natrona County International Airport, WY et Missoula-Johnson-Bell Field, MT est de 742 km (464 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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