MINR · CESSNA 501 · 2016-05-24 · Texarkana, AR, USA
Event
NTSB number
CEN16LA197
Event ID
20160527X13034
Type
Accident
Date
2016-05-24
Location
Texarkana, AR, USA
Coordinates
33.441665, -94.03778
Injuries
Highest injury
MINR
Fatal
0
Serious
0
Minor
3
Uninjured
1
Total aboard
4
Aircraft
Make
CESSNA
Model
501
Registration
N804ST
FAR Part
091
Engines
2
Damage
SUBS
Conditions
Light
NDRK
Weather
VMC
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.