AN LR31 STRIKES ITS DORSAL FIN ON A GPU PARKED TOO CLOSELY TO THE TAIL WHEN DEP LAL; FL.

Narrative

THE CAPT (PIC) AND I (SIC) WERE DEPARTING THE RAMP AREA. AFTER THE CAPT STARTED THE ENGS; HE GAVE THE RAMP PERSON THE DISCONNECT GPU SIGN. THE RAMP PERSON RAN AROUND THE ACFT; DISCONNECTED THE GPU (GND PWR UNIT) THAN REAPPEARED IN FRONT OF THE ACFT. THE RAMP PERSON STARTED TO MARSHALL THE CAPT FORWARD FOR 2 FT THEN SHE HAD THE CAPT MAKE A L TURN. ONCE THE CAPT TURNED THE ACFT TO THE L THE TAIL OF THE PLANE STRUCK THE GPU UNIT. THE CAPT SHUT DOWN BOTH ENGS AND EXAMINED THE DAMAGE. A DENT ON THE REAR DORSAL FIN WAS DAMAGED FROM THE GPU. TO PREVENT THIS; THERE SHOULD BE 2 RAMP PERSONNEL AT A MINIMUM TO MARSHALL THE ACFT OUT OF THE TARMAC. SUPPLEMENTAL INFO FROM ACN 467361: WE HAD SVC PROVIDE US WITH A PWR CART. THEY PLACED IT JUST BEHIND THE WING ON THE R SIDE OF THE PLANE. ABOUT THE SAME TIME THEY TOWED AND PARKED A BEECHCRAFT BARON DIRECTLY IN FRONT OF US (WE PARKED ON AN ANGLE). THE POS OF THE BARON REQUIRED US TO MAKE AN IMMEDIATE L TURN OUT OF PARKING. I AM ALWAYS VERY AWARE OF THE PARKING AND PLACEMENT OF THE PWR CART ON OUR PLANE. I WILL BE SURE IT IS PARKED BEHIND THE TAIL FROM NOW ON.