Action
Notice of proposed rulemaking (NPRM).
Summary
We propose to adopt a new airworthiness directive (AD) for certain Model 777-200 series airplanes. This proposed AD would require installing a new circuit breaker, relays, and wiring to allow the flightcrew to turn off electrical power to the in-flight entertainment (IFE) systems and other non-essential electrical systems through a switch in the flight compartment, and doing other specified actions. The actions include removing the cabin system control panel (CSCP) core partition software, the cabin area control panel (CACP) operational program software (OPS), the zone management units (ZMU) OPS, and the cabin system management unit (CSMU) OPS; installing OPS for the CSCP, CACP, ZMU, and CSMU; and installing the new configuration database (CDB). This proposed AD would also require installing a new CSCP; installing a new cabin management system (CMS) CDB; and installing new OPS for the CSCP, ZMU, passenger address controller, cabin interphone controller, CACP, speaker drive module, overhead electronics units, and seat electronics unit. This proposed AD results from an IFE systems review. We are proposing this AD to ensure that the flightcrew is able to turn off electrical power to the IFE system and other non-essential electrical systems through a switch in the flight compartment in the event of smoke or flames. The flightcrew's inability to turn off electrical power to the IFE system and other non-essential electrical systems in the event of smoke or flames could result in the inability to control smoke or flames in the airplane flight deck or passenger cabin during a non-normal or emergency situation.