Aug 14, 2011
Accident
Substantial Los Banos, CA
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 137
Probable Cause
The pilot’s inadequate preflight, and contamination of both the engine compressor section and the main rotor blades, which resulted in reduced performance of the engine and rotor system.
NTSB WPR11LA379