Aug 23, 2004
Accident
Substantial Leroy, MN
Injuries1 serious
Phase of Flight-
ConditionsVMC
OperationFAR 091
Probable Cause
The partial loss of engine power due to the missing 1/8-27 NPT Allen plug as a result of other maintenance personnel undertorquing the plug. Additionally, the pilot improperly excecuted a run on landing. A factor was the loss of tail rotor effectiveness.
NTSB CHI04CA237