Airworthiness Directive · Amendment 39-15975 · Boeing Model 747-400 and -400D Series Airplanes
Boeing Model 747-400 and -400D Series Airplanes
This AD applies to Boeing Model 747-400 and -400D series airplanes, certificated in any category; as identified in Boeing Service Bulletin 747-24-2246, dated October 6, 2005.
We are adopting a new airworthiness directive (AD) for certain Boeing Model 747-400 and -400D series airplanes. This AD requires installing new relays to allow the flightcrew to turn off electrical power to the in-flight entertainment (IFE) system and other non- essential passenger cabin systems through the left and right utility bus switches, and other specified actions. This AD results from an IFE systems review. We are issuing this AD to ensure that the flightcrew is able to turn off electrical power to the IFE system and other non- essential passenger cabin systems through utility bus switches in the flight compartment, in the event of smoke or fumes. The flightcrew's inability to turn off electrical power to the IFE system and other non- essential passenger cabin systems could result in the inability to control smoke or fumes in the airplane flight deck or passenger cabin during a non-normal or emergency situation.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 60 months after the effective date of this AD, install new relays to allow the flightcrew to turn off electrical power to the IFE system and other non-essential passenger cabin systems through the left and right utility bus switches and do all other specified actions as applicable, by accomplishing all the applicable actions specified in the Accomplishment Instructions of Boeing Service Bulletin 747-24-2246, dated October 6, 2005. The other specified actions must be done before further flight after installing the new relays.
