Jan 28, 2018
Incident
Minor Memphis, TN
InjuriesNone
Phase of Flight-
ConditionsVMC
OperationFAR 135
Probable Cause
The pilot’s failure to lock the collective pitch control after landing, and the mechanic’s failure to properly balance the collective pitch control after converting the helicopter to a single-pilot configuration, which resulted in an uncommanded collective movement and subsequent hard landing.
NTSB ERA18IA078