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Datum:maandag 23 mei 2016
Type:Silhouette image of generic C501 model; specific model in this crash may look slightly different
Cessna 501 Citation I/SP
Luchtvaartmaatschappij:Eagle II Aero LLC
Registratie: N804ST
Constructienummer: 501-0146
Bouwjaar: 1980
Aantal vlieguren:7424
Motoren: 2 Williams International FJ44-2A
Bemanning:slachtoffers: 0 / inzittenden: 1
Passagiers:slachtoffers: 0 / inzittenden: 3
Totaal:slachtoffers: 0 / inzittenden: 4
Schade: Groot
Plaats:nabij Texarkana, AR (   Verenigde Staten)
Fase: Kruisvlucht (ENR)
Soort vlucht:Privévlucht
Vliegveld van vertrek:Perryville Municipal Airport, MO, Verenigde Staten
Vliegveld van aankomst:San Antonio International Airport, TX (SAT/KSAT), Verenigde Staten
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:
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 1 months
Accident number: CEN16LA197
Download report: Final report
Language: English



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

Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Perryville Municipal Airport, MO en San Antonio International Airport, TX bedraagt 1212 km (758 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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