Mar 3, 2019
Accident
Substantial Union Center, SD
Injuries1 minor
Phase of Flight-
ConditionsVMC
OperationFAR 135
Probable Cause
The ambulance driver’s failure to see the helicopter’s rotating main rotor blades in dark night conditions, which resulted in the ambulance’s inadvertent collision with the helicopter. Contributing to the accident was the ambulance driver's failure to follow procedures when approaching the helicopter.
NTSB CEN19LA092