PurposeUSED TO INFLATE LANDING GEAR TIRES AND TO CONTROL TIRE PRESSURE. THE TIRE PRESSURE GAUGE IS USED TO MEASURE TIRE PRESSUREAirplane707, 727, 737, 747, 757, 767, 777-200, 777-200ER, 777-200LR, 777-300, 777-300ER, 777-8, 777-9, 777F, 787-10, 787-8, 787-9Usage CodeMAINTENANCE 