ACFT DAMAGE AND PERSONNEL INJURY DURING PUSHBACK.

Narrative

DURING PUSHBACK; THE CAPT COMMUNICATED TO THE TUG DRIVER TO PUSH BACK ONLY TO THE HOLD LINE. THE TUG DRIVER THEN PUSHED US BACK BEYOND THE HOLD LINE; THEN STOPPED. I THEN HAD TO CONTACT RAMP CTL TO INFORM THEM OF THE SIT. THE CAPT THEN TOLD THE TUG DRIVER THAT HE HAD PUSHED BACK TOO FAR. AS I TALKED TO RAMP CTL; I WAS LOOKING BEHIND AND R TO SEE IF THERE WERE ANY ACFT THAT WERE ENDANGERED BY OUR ACFT. AT THAT TIME I HEARD A LOUD BANG. I LOOKED FORWARD AND SAW THAT THE TUG DRIVER WAS NOT ON THE TUG AND THE HEADSET WAS LEFT ON THE TUG. I COULD ONLY SEE THE TUG WITHOUT ANYONE NEAR IT. THE ACFT STARTED TO ROLL FORWARD THEN WAS STOPPED QUICKLY BY THE CAPT. ONCE WE STOPPED; I SAW THE TUG DRIVER HOLDING HIS ARM THAT WAS BROKEN AS HE WALKED TO THE R OF THE ACFT; OUT FROM UNDER THE NOSE. AT NO TIME DID I THINK THE GND CREW WAS GOING TO DISCONNECT THE TOW BAR. I NEVER HEARD A COMMAND TO THE CAPT TO SET THE BRAKES. THE TUG DRIVER WAS NOT FOLLOWING COMPANY PROCS; HE NEVER SHOULD HAVE TAKEN OFF THE HEADSET OR LEFT THE TUG UNATTENDED. HE WAS NOT FOLLOWING THE CAPT'S INSTRUCTIONS. THE ACFT STRUT AND NOSE GEAR DOOR WERE DAMAGED. SUPPLEMENTAL INFO FROM ACN 569220: DURING PUSHBACK (USING HEADSETS) TUG OPERATOR WEARING HEADSET FAILED TO INFORM FLC PUSHBACK COMPLETED OR REQUEST PARKING BRAKE. GND CREW ATTEMPTED TO REMOVE TOW BAR CAUSING ACFT DAMAGE (R NOSE GEAR DOOR) AND PERSONNEL INJURY (BROKEN ARM). FLT WAS UNDER ASSUMPTION ACFT WAS STILL BEING POSITIONED. UNABLE TO SEE GND CREW OR TOW; FLC NEEDS TO BE INFORMED OF TERMINATION OF PUSHBACK AND REQUEST PARKING BRAKE AND REMOVE TOW BAR. 1) FAILURE OF TOW DRIVER TO TERMINATE PUSHBACK WITH CREW. 2) FAILURE OF TOW DRIVER TO STRAIGHTEN OUT ALIGNMENT OF TOW TRACTOR; TOW BAR ON ACFT. 3) TOW TRACTOR DRIVER TOOK OFF HEADSET. 4) TOW TRACTOR DRIVER FAILED TO ASK FLC TO 'SET PARKING BRAKE.' 5) TOW TRACTOR DRIVER LEFT TOW TRACTOR AND TRIED TO DISCONNECT.