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Accident description
Last updated: 22 October 2017
Status:Preliminary - official
Date:Monday 23 May 2016
Type:Silhouette image of generic C501 model; specific model in this crash may look slightly different
Cessna 501 Citation I/SP
Operator:Eagle II Aero LLC
Registration: N804ST
C/n / msn: 501-0146
First flight: 1980
Crew:Fatalities: 0 / Occupants: 1
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 0 / Occupants: 1
Airplane damage: Substantial
Location:near Texarkana, AR (   United States of America)
Phase: En route (ENR)
Departure airport:Perryville Municipal Airport, MO, United States of America
Destination airport:San Antonio International Airport, TX (SAT/KSAT), United States of America
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 landing without further incident. The airplane sustained substantial damage to both wings due to the excessive loads on the wings during the descent/recovery. The airline transport pilot, who was the sole occupant, was uninjured.
The airplane was registered to Eagle II Aero LLC and was operated under 14 Code of Federal Regulations as a personal flight that was operating on an instrument rules flight plan.
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.


Loss of control



photo of Cessna 501 Citation I/SP N804ST
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This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Perryville Municipal Airport, MO to San Antonio International Airport, TX as the crow flies is 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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