PurposeUSED TO REMOVE AND INSTALL PASSENGER SEATS DURING HEAVY MAINTENANCE. COUNTERWEIGHT EQUIPMENT USED WITH GANTRY EQUIPMENT TO BALANCE PASSENGER SEATS WITH AFT CENTER OF GRAVITYAirplane747, 777-200, 777-200ER, 777-200LR, 777-300, 777-300ER, 777-8, 777-9, 787Usage CodeMAINTENANCE 