Jun 6, 2006
Accident
Substantial Ennis, MT
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 091
Probable Cause
The loss of engine power during takeoff due to an excessively lean fuel-to-air mixture ratio as a result of excessive mating surface wear between the mixture control arm and metering shaft. A factor was the improper installation of the new engine, which resulted in excessive wear and metering of fuel and loss of engine power. An additional factor was the rough, uneven terrain.
NTSB SEA06LA114