MECHANICS REPORT ON HOW THEY PERFORMED AN ANTI-SKID FUNCTIONAL TEST ON AN AIRBUS A320 AFTER A GEAR CHANGE. ACFT LATER WENT OFF THE RUNWAY UPON LANDING.

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I WAS ASSIGNED TO PERFORM AN ANTI-SKID FUNCTIONAL TEST ON ACFT X. AS THIS JOB REQUIRES SEVERAL PEOPLE TO ACCOMPLISH I ENLISTED THE HELP OF 3 OTHER PEOPLE. ONE MECH WAS SPINNING THE TRANSDUCERS ON THE L GEAR (BRAKES #1 AND #2). ONE MECH OBSERVED THE OP OF THE BRAKES. ONE MECH WAS IN THE COCKPIT APPLYING THE BRAKES. I POSITIONED MYSELF ON THE R GEAR (BRAKES #3 AND #4) AND COMMUNICATED WITH THE COCKPIT MECH VIA RADIO. WE RAN THROUGH THE TEST AS THE JOB CARD CALLED OUT. AS WE RAN THROUGH THE PROC I WOULD COMMUNICATE WITH THE COCKPIT MECH FOR THE APPLICATION AND RELEASE OF THE BRAKES AND INSTRUCTED THE L GEAR MECH TO START/STOP THE DRILL MOTOR. AT THE SAME TIME THE BRAKE OBSERVER WOULD LET US KNOW IF THE BRAKE BEING TESTED RELEASED AT THE PROPER TIME. WE TESTED ALL THE BRAKES AND EVERYTHING PASSED AS CALLED OUT IN THE CARD. SUPPLEMENTAL INFO FROM ACN 791817: I HELPED ACCOMPLISH ANTI-SKID TEST WITH 3 OTHER MECHS. I SPUN BRAKE TRANSDUCERS #1 AND #2 AS INSTRUCTED BY JOB CARD. SUPPLEMENTAL INFO FROM ACN 791818: ACFT X CAME INTO ZZZ AND WENT OFF THE RWY. PRELIMINARY RPTING IS THAT ANTI-SKID TACHOMETERS WERE WIRED BACKWARDS. I DID THE RECEIVING INSPECTION ON THE GEAR BEFORE IT WAS REPLACED. THERE IS NO PROVISION IN THE JOINT DOCUMENT TO VERIFY ROUTING OF CABLES.