PLT OF ROTARY WINGED ACFT LEAVES BLADES TURNING WHILE EXITING ACFT FOR GND REFUELING PROC. THROTTLE CREEPS OPEN; ACFT LIFTS OFF AND FALLS OVER. ACFT DAMAGED.

Narrative

ON OR ABOUT XX00; I LANDED AT COMMODORE HELIPORT FROM DOING TFC WATCH. I ROLLED THE THROTTLE BACK TO 70 PERCENT N1 AND APPLIED CYCLIC FRICTION. THERE WAS MINIMAL FRICTION ON THE COLLECTIVE. I THEN EXITED THE HELI AND REFUELED IT. AFTER REPLACING THE FUEL HOSE AT THE REFUELING STATION; I TOOK A LADDER TO THE L SIDE OF THE ACFT; RAISED THE L ENG COWLING; PERFORMED A QUICK LEAK CHK AND CLOSED THE COWLING. AS I WAS REMOVING THE LADDER BACK TO ITS STORAGE AREA I HEARD THE ENG RPM INCREASE. THE ACFT THEN PICKED UP INTO THE AIR; THE TAIL ROTOR STRUCK THE GND; THE HELI THEN ROLLED ONTO ITS R SIDE. THERE WERE NO OCCUPANTS IN THE ACFT. THERE WERE NO INJURIES OR PROPERTY DAMAGE OTHER THAN DAMAGE TO THE ACFT ITSELF AND A WOOD BOX AT THE HELIPORT. NTSB WAS NOTIFIED BY OPERATOR. NTSB STATED THIS WAS AN INCIDENT NOT REQUIRING NOTIFICATION. THE FAA FROM OAK FSDO CAME AND LOOKED AND TOOK A RPT; LOOKED AT ACFT. LEAVING AN ACFT ENG RUNNING WITHOUT A PLT AT THE CTLS IS A STUPID THING TO DO. FROM NOW ON I WILL NOT LEAVE THE ACFT UNTIL THE ENG IS SHUT DOWN AND THE ROTOR BLADES ARE STOPPED. I BELIEVE THIS INCIDENT OCCURRED BECAUSE THE CYCLIC POSSIBLY MOVED FORWARD CAUSING THE COLLECTIVE TO BEGIN TO RAISE WITH THE THROTTLE OPENING ENOUGH FOR THE HELI TO LIFT OFF. I BELIEVE THIS COULD BE THE CAUSE OF THE UNCOMMANDED ENG ACCELERATION.