PurposeUSED TO PROTECT THE MAINTENANCE ACCESS TERMINAL (MAT) DURING REMOVAL OR REPLACEMENT OF THE NUMBER TWO WINDOW ON THE RIGHT SIDE OF THE FLIGHT DECKAirplane777-200, 777-200ER, 777-200LR, 777-300, 777-300ER, 777-8, 777-9, 777FUsage CodeMAINTENANCE 