PurposeUSED IN CONJUNCTION WITH THE SQUIB TEST BOX J26004 TO RECORD THE ELAPSED TIME BETWEEN THE INITIAL AND SECONDARY SQUIB FIRINGS OF THE CARGO FIRE EXTINGUISHING BOTTLESAirplane777-200, 777-200ER, 777-200LR, 777-300, 777-300ER, 777-8, 777-9, 777FUsage CodeMAINTENANCE 