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Last updated: 19 October 2021
Statuts:Enquête Officielle
Date:lundi 23 mai 2016
Heure:21:56
Type/Sous-type:Silhouette image of generic C501 model; specific model in this crash may look slightly different
Cessna 501 Citation I/SP
Compagnie:Eagle II Aero LLC
Immatriculation: N804ST
Numéro de série: 501-0146
Année de Fabrication: 1980
Heures de vol:7424
Moteurs: 2 Williams International FJ44-2A
Equipage:victimes: 0 / à bord: 1
Passagers:victimes: 0 / à bord: 3
Total:victimes: 0 / à bord: 4
Dégats de l'appareil: Substantiels
Lieu de l'accident:près de Texarkana, AR (   Etats-Unis d'Amérique)
Phase de vol: En vol (ENR)
Nature:Privé
Aéroport de départ:Perryville Municipal Airport, MO, Etats-Unis d'Amérique
Aéroport de destination:San Antonio International Airport, TX (SAT/KSAT), Etats-Unis d'Amérique
Détails:
A Cessna 501, N804ST, lost cabin pressurization during cruise at flight level 430 and entered an uncontrolled descent near Texarkana, Arkansas. The pilot regained consciousness and control of the airplane about 7,000 feet mean sea level and landed without further incident. The airplane sustained substantial damage to both wings due to the excessive loads on the wings during the descent/recovery. The pilot and two passengers sustained minor injuries and one passenger was uninjured.
Night meteorological conditions prevailed at the time of the accident.

Post-accident examination of the airplane revealed that the primary pressurization duct into the cabin was separated from its connection to the water separator. The duct's metal retaining clamp was present with its retaining screw in place. The clamp was not fractured and was resting around the metal duct leading to the separator.

Probable Cause:

PROBABLE CAUSE: "The pilot's failure to use supplemental oxygen as required during high-altitude flight, which resulted in his loss of consciousness following a loss of cabin pressurization. Contributing to the accident was the separation of the air conditioning system's primary pressurization duct and the subsequent failure of the aft pressure bulkhead check valve flapper due to progressive weakening from age."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 1 months
Accident number: CEN16LA197
Download report: Final report

Sources:
» NTSB


Photos

photo of Cessna-501-Citation-I-SP-N804ST
 

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 Perryville Municipal Airport, MO et San Antonio International Airport, TX est de 1212 km (758 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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