MECHANIC TOWING AN MD80 INTO GATE AREA STRIKES A TRUCK. ONLY ONE WING WALKER USED.

Narrative

WHILE MOVING AN OTS ACFT OFF THE GATE TO THE HANGAR AND ASSIGNED TO BRING A REPLACEMENT MD80; APCHING THE GATE; L WINGTIP STRUCK A SVC TRUCK WHICH FROM MY VIEW LOOKED CLR. I CTRED THE ACFT ON CTRLINE AND THEN FELT THE TRACTOR SHAKE. I THEN LOOKED BACK AT THE NOSEWHEELS TO SEE IF THE TOWBAR DISCONNECTED AND AGAIN AT THE WINGTIP AND SAW A MAN WAVING HIS HANDS. I IMMEDIATELY USED THE HAND BRAKE AND FOOT BRAKE TO STOP THE ACFT; BUT IT WAS TOO LATE. ALTHOUGH IT HAS BEEN STANDARD PRACTICE TO USE ONLY ONE WING WALKER HERE AT ZZZ; IN THE FUTURE I WILL ENSURE I WILL ONLY MOVE AN ACFT IF I HAVE TWO WING WALKERS. SUPPLEMENTAL INFO FROM ACN 792797: WE WERE BRINGING A REPLACEMENT MD80 ACFT BACK TO THE GATE. AS WE CAME TO THE GATE AREA; THE TRACTOR DRIVER STOPPED AND I GOT OFF THE TRACTOR AND WING WALKING ON THE R SIDE. BEFORE WE GOT ALL THE WAY ON THE GATE; THE TRACTOR DRIVER STOPPED AND I REALIZED SOMETHING WAS WRONG. WHEN I LOOKED AT THE L SIDE OF THE WING; THE ACFT HAD STRUCK A SVC TRUCK. TO PREVENT THIS; ALWAYS USE TWO WING WALKERS. THE CURRENT PROC IS TO USE ONLY ONE WING WALKER.