Jun 18, 2002
Incident
TALKEETNA, AK
Injuries1 serious
Phase of Flight-
ConditionsVMC
OperationFAR 135
Probable Cause
The passenger's incapacitation during a high altitude flight due to a loss of consciousness as the result of a pre-existing cardiovascular condition. A contributing factor in the incident was the operator's improper use of disposable oxygen masks without a reservoir bag above the recommended upper altitude limit for use of this type mask.
NTSB ANC02IA093