PurposeUSED TO LOCATE THE UPLOCK ROLLER ON THE INSTALLED MAIN LANDING GEAR DOOR RELATIVE TO UPLOCK HOOK GEOMETRY, WITH THE DOOR IN A FREE STATE AND IN CONTACT WITH DOOR STOPSAirplane777-200, 777-200ER, 777-200LR, 777-300, 777-300ER, 777-8, 777-9, 777FUsage CodeMAINTENANCE 