Jan 2, 2013
Accident
Substantial Seminole, OK
Injuries4 serious
Phase of Flight-
ConditionsVMC
OperationFAR 091
Probable Cause
The loss of engine power due to ice ingestion. Contributing to the accident was maintenance personnel’s delayed decision to install the helicopter's engine inlet cover until after the engine had been exposed to moisture and freezing temperatures and their inadequate daily preflight/airworthiness checks, which did not detect the ice formation.
NTSB CEN13FA121