As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GOVERNER MANUAL/AUTOMATIC CONTROL SWITCH IS LOCATED ON THE COLLECTIVE CONTROL HEAD. THIS SWITCH IS NEITHER A GUARDED OR LOCKOUT TYPE SWITCH. IT IS EASILY BUMPED INTO THE MANUAL CONTROL MODE. THIS HAS CAUSED SEVERAL MAIN ROTOR OVERSPEED INCIDENTS. THIS SWITCH NEEDS TO BE CHANGED TO A POSITIVE LOCK OR GUARDED SWITCH.