Airworthiness Directive · Amendment 39-10023 · Boeing Model 777 Series Airplanes
Boeing Model 777 Series Airplanes
Superseded. A later AD replaced this one: AD 2000-23-28. Comply with the one in force.
All Model 777 series airplanes, certificated in any category.
This amendment adopts a new airworthiness directive (AD) that is applicable to all Boeing Model 777 series airplanes. This action requires repetitive testing of the engine fire shutoff switch (EFSS) to determine that the override mechanism and the switch handle are operational, and replacement of the EFSS, if necessary. This action also requires, for certain airplanes, installation of a collar on a specific circuit breaker of the standby power management panel, and installation of placards to advise the flightcrew that the override mechanism must be pushed in order to pull the fire switch. This amendment is prompted by a report indicating that a solenoid and an override mechanism of the EFSS were not operational due to overheating of the solenoid. The actions specified in this AD are intended to prevent damage to the EFSS solenoid and to the override mechanism, and consequent failure of the EFSS due to overheating of the solenoid; such failure of the EFSS could result in the inability of the flightcrew to discharge the fire extinguishing agent in the event of an engine fire.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
