Apr 1, 1999
Accident
Destroyed GRAND CANYON, AZ
Injuries1 fatal, 1 serious
Phase of Flight-
ConditionsVMC
OperationFAR 091
Probable Cause
The failure of the flight crew to properly preflight the helicopter and to detect and remove accumulated snow from the engine inlets and plenum chamber. Factors in the accident were the clouded plenum chamber inspection window and the failure of preceding flight crew to install the engine inlet covers in accordance with the operator's procedure.
NTSB LAX99FA136