A MECHANIC AND INSPECTOR REPORT ON MISSING THE REINSTALLATION OF A REQUIRED WHEEL SPACER DURING A TIRE CHANGE ON A B767-300 RH MLG AT THE FORWARD LEFT INBOARD TIRE (#3) POSITION. DAMAGE TO TIRE AND BRAKE FOLLOWED.

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#3; #4; #7 TIRES WERE BELOW PROCS MANUAL LIMITS. WHILE IN THE PROCESS REPLACING #4 TIRE; A HVY GUST OF WIND CAME THROUGH HANGAR WHILE THE DOOR WAS OPEN; HAD TO STOP; DUE TO AN ACFT JACK WAS MOVING; DUE TO NOT PROPERLY SECURED; IT WAS ABOUT TO DAMAGE #1 ENG COWL INLET AND I THINK THAT WAS WHAT HAD CAUSED A DISTR. I DO NOT WANT TO MAKE ANY EXCUSES FOR WHAT HAPPENED BUT DUE TO UNFORESEEN CIRCUMSTANCES THAT OCCURRED DURING WORK WAS A CONTRIBUTING FACTOR FOR THIS HAPPENING. SUPPLEMENTAL INFO FROM ACN 798621: WHILE PERFORMING RII ON TIRE CHANGE ON ACFT X; THERE WERE HIGH WINDS; AND WHILE CONCERN TO SECURE GND EQUIP I GLANCE AT THE TIRE SPACER TO VERIFY ITS PRESENCE. I GUESS IN MY HASTE I MIGHT HAVE MISSED IT. IT WAS LEFT OFF; CAUSING DAMAGE TO THE WHEEL AND BRAKE. WIND AND OTHER DISTRS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER STATED HE AND THE LEAD MECHANIC; WHO WAS UPGRADED TO PERFORM RII INSPECTION; HAD ALREADY INSTALLED AND TORQUED THE #4 AND #7 TIRES; WHEN STRONG WINDS SUDDENLY BLEW INTO THE OPEN HANGAR MOVING MECHANICS' ROLL-A-WAY TOOLBOXES AND SENDING THE ACFT NOSE JACK HEADING TO THE #1 ENGINE INLET COWL. REPORTER STATED THIS DISTRACTION WAS ENOUGH FOR THE LEAD AND HIMSELF TO MISS VERIFYING THE REQUIRED WHEEL SPACER WAS INSTALLED AT THE RH MLG LEFT FORWARD INBOARD TIRE POSITION. THE MISSING SPACER WAS LATER FOUND; STILL STUCK TO THE OLD REMOVED TIRE. BUT THE ACFT HAD BEEN RELEASED AND THE DAMAGE TO THE TIRE AND BRAKE HAD ALREADY OCCURRED.