A MECHANIC CONTRACTED BY HIS CARRIER TO REPLACE A BLOWN OUTBOARD TIRE AND BRAKE ASSEMBLY ON THE LEFT MAIN GEAR OF ANOTHER CARRIER'S B737-800; WAS TOLD BY THE BORROWING CARRIER'S MAINTENANCE CONTROLLER HE HAD A ONE TIME APPROVAL FOR THE REPLACEMENT.

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I CAME INTO WORK IN ZZZ AT APPROX XA00. I WAS TOLD THAT ANOTHER CARRIER WAS WAITING FOR APPROVAL TO INSTALL OUR BRAKE ASSEMBLY ALONG WITH OUR WHEEL ASSEMBLY DUE TO THEIR ACFT HAVING BLOWN A TIRE AND NEEDED A BRAKE AND TIRE. THE AIRPLANE HAD BEEN SITTING FOR A WHILE NEEDING MAINT. THE HOLD-UP WAS THAT OUR CARRIER'S BRAKE ASSEMBLY AND WHEEL ASSEMBLY WERE NOT EFFECTIVE PER THEIR IPC. MAINT CTL FOR THE OTHER CARRIER THEN CALLED AND SAID WE HAD A ONETIME APPROVAL TO REPLACE THEIR BRAKE ASSEMBLY AND WHEEL ASSEMBLY WITH OURS (OUR CARRIER'S PARTS) EVEN THOUGH THE PARTS WERE NOT EFFECTIVE PER THEIR IPC. THEY FAX'ED OVER THEIR ACFT MAINT MANUAL TO GO AHEAD AND REPLACE THE PARTS. I WAS DIRECTED BY THE OTHER ACR TO PROCEED WITH THE REPLACEMENT OF THE BRAKE ASSEMBLY AND WHEEL ASSEMBLY PER THE AMM. WHEN I WAS DONE; BY FOLLOWING THEIR INSTRUCTIONS; I ASKED THE OTHER ACR'S APPROVAL PAPERWORK TO USE OUR PARTS AND I WAS TOLD THAT THEIR PARTS TAG WAS THEIR APPROVAL. I WAS GUIDED BY THEIR MAINT CTLR ON FILLING THEIR PARTS TAG AND THEIR LOGBOOK. I ASKED AGAIN IF THE PARTS TAG WAS THEIR APPROVAL AND IT WAS CONFIRMED. THE WHOLE TIME MAINT CTL FOR THE OTHER ACR WAS AWARE OF THE PARTS EFFECTIVITY SITUATION.CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING INFORMATION: REPORTER STATED THE MAINTENANCE CONTROLLER FOR THE CARRIER BORROWING THE B737-800 BRAKE AND TIRE; NEVER DID PRODUCE THE NECESSARY ONE TIME APPROVAL PAPERWORK. REPORTER STATED HE ENTERED THE TIRE AND BRAKE DATA ON THE PARTS TAG; BUT SOMEHOW; THAT TAG COULD NOT BE FOUND LATER. REPORTER STATED HE COULD NOT SEPARATE THE BLOWN TIRE AND WHEEL FROM THE BRAKE ASSEMBLY BECAUSE THE INBOARD BEARING OF THE TIRE HAD BROKEN CAUSING THE TIRE/WHEEL ASSEMBLY TO SEIZE ON THE BRAKE. HE HAD TO SHIP BOTH PARTS AS ONE UNIT. REPORTER STATED HE WAS LATER INFORMED THE TIRE AND BRAKE FROM HIS CARRIER'S B737-800'S WERE ACTUALLY COMPATIBLE WITH THE BORROWING CARRIER'S BRAKE AND TIRE SPECIFICATIONS FOR THEIR B737-800 AIRCRAFT.