A MECHANIC REPORTS ABOUT TAIL DAMAGE CAUSED; WHEN THE VERTICAL STAB AND RUDDER CAME IN CONTACT WITH THE LEFT HAND VERTICAL STAB OF ANOTHER DHC-8-400. NOT FOLLOWING PROCEDURES WHEN MOVING AIRCRAFT IN THE HANGAR CITED AS CAUSE.

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AT XA05 NOTIFIED BY CO-WORKER THAT THE LEAD WANTED ACFT X TO BE MOVED PRIOR TO BREAKING FOR LUNCH. I HELPED MOVING EQUIP FROM VICINITY OF ACFT; NOTED POS OF ACFT X IN HANGAR AND ITS LOCATION RELATIVE TO ACFT Y. RETRIEVED TUG AND TOW BAR AND HOOKED TOW BAR TO ACFT X. CO-WORKER ASSUMED THE POS OF BRAKE RIDER IN COCKPIT; TECHNICIAN 3 WAS WING WALKING THE R-HAND WINGTIP THAT WAS CLOSEST TO THE E HANGAR WALL. TECHNICIAN 4 WAS IN PROGRESS OPENING THE W HANGAR DOOR. ANTICIPATING THE ACFT WAS CLEAR AND THAT THE WING WALKER WAS WATCHING THE ACFT FROM HIS PERSPECTIVE FROM THE R-HAND WINGTIP AND THERE WAS ADEQUATE CLRNC ON THE L-HAND SIDE. I SLOWLY STARTED IN REVERSE TO EXTRACT THE ACFT FROM THE HANGAR; ACFT MOVED APPROX 20 FT WHEN I HEARD VARIOUS LOUD SHOUTS FROM BYSTANDERS AT THE C-CHK E BUNKER TO STOP. THIS WAS AT THE SAME TIME A LOUD NOISE CREATED WHEN ACFT X VERT STABILIZER AND RUDDERS CAME IN CONTACT WITH ACFT Y L-HAND VERT STABILIZER TIP. THE SUPVR WAS NOTIFIED OF THE INCIDENT IMMEDIATELY BY SOMEONE; EVEN BEFORE I WAS AWARE THE INCIDENT HAD HAPPENED! I STOPPED THE TUG AND SECURED THE ACFT WITH CHOCKS AND HAD THE BRAKE SET BY THE BRAKE RIDER; BEFORE I WENT BACK AND REALIZED WHAT HAD HAPPENED. IT WAS NOTICED BY MANY BYSTANDERS AFTER OR DURING THE CONTACT OF THE ACFT. SUPVR FOLLOWED THE ACFT DAMAGE PROCS. DAMAGE TO THE ACFT WAS DOCUMENTED. ACFT WERE SEPARATED AND MOVED. MAINT/CAUSE: 1) LACK OF TEAMWORK: THERE WAS NOT ENOUGH PERSONNEL ASSIGNED TO THE TASK OF MOVING THE ACFT. 2) NORMS: WE JUST MOVE THE ACFT; OFTENTIMES WITHOUT AS MANY WING WALKERS AS SPECIFIED IN PROCEDURES MANUAL. 3) ASSERTIVENESS: I DIDN'T WANT TO BE A PROB BY WAITING FOR; OR WANTING TO HAVE THE ADEQUATE WING WALKERS. 4) I ASSUMED WITH ALL THE PEOPLE HANGING OUT AT THE AREA OF THE TAILS OF ACFT X AND Y THAT SOMEONE WAS KEEPING AN EYE ON THINGS. DO NOT PUT ACFT IN HANGAR NOSE FIRST; DO NOT STACK ACFT WITH TAILS OVERLAPPING. DO NOT POSITION ACFT IN SITUATIONS THAT DAMAGE AN EASILY OCCUR. ALWAYS HAVE THE ADEQUATE NUMBER OF PERSONNEL ASSIGNED TO THE ACFT WHEN TOWING. HAVE THE WORKING CULTURE DEVELOPED AT THE AIRLINE THAT THE PROCEDURES MANUAL IS BASED ON; DEPENDING ON.