Airworthiness Directive · Amendment 39-18530 · Fuel
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 777-200, -200LR, -300, -300ER, and -777F series airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 777-28-0078, Revision 1, dated April 27, 2015.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777 airplanes. This AD was prompted by reports of unreliable performance of the fuel scavenge system. This AD requires changing the main fuel tank water scavenge system, center fuel tank fuel scavenge system, and certain electrical panels; doing related investigative actions; doing corrective actions if necessary; and, for certain airplanes, changing the fuel scavenge system to give redundant control of the center override/jettison fuel pumps and main jettison fuel pumps. We are issuing this AD to prevent fuel exhaustion and subsequent power loss of all engines due to loss of capability to scavenge fuel in the center fuel tank.
For airplanes identified in Boeing Special Attention Service Bulletin 777-28-0078, Revision 1, dated April 27, 2015, except for Group 10 airplanes on which the actions specified in Boeing Service Bulletin 777-28-0060; or Work Package 2 of the Accomplishment Instructions of Boeing Service Bulletin 777-28-0062, have not been accomplished: Within 60 months after the effective date of this AD, do the applicable actions specified in paragraphs (g)(1) through (g)(6) of this AD; and do all applicable related investigative and corrective actions; in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 777-28-0078, Revision 1, dated April 27, 2015. Do all applicable related investigative and corrective actions before further flight.
(1) Do applicable mechanical changes to the main fuel tank water scavenge system and center fuel tank fuel scavenge system.
(2) Install relays and related equipment on the P301 and P302 panels in the main equipment center.
(3) Do applicable wiring changes between the P105, P110, and P301 panels, and between the P200, P205, P210, and P302 panels.
(4) Do wiring changes in the P105 panel.
(5) Install new electrical load management system 2 (ELMS2) software.
(6) Do a functional test consisting of operational tests, a leak test, system tests, and a fuel scavenge system functional test. If any of the tests fail, before further flight accomplish corrective actions and repeat the test and applicable corrective actions until the test is passed.
(1) For Groups 13 through 16 airplanes, as identified in Boeing Special Attention Service Bulletin 777-28-0078, Revision 1, dated April 27, 2015, concurrently with accomplishing the actions required by paragraph (g) of this AD, install a new P301 panel on the left side of the airplane, install a new P302 panel on the right side of the airplane, and change the wiring; or perform bonding resistance measurements and rework the airplane installations; as applicable; in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-28A0047, Revision 5, dated September 20, 2010; or Boeing Service Bulletin 777-28A0047, Revision 6, dated July 11, 2013.
(2) For airplanes identified in Boeing Special Attention Service Bulletin 777-28-0078, Revision 1, dated April 27, 2015, except for Group 10 airplanes on which the actions described in Boeing Service Bulletin 777-28-0060; or Work Package 2 of the Accomplishment Instructions of Boeing Service Bulletin 777-28-0062, have not been accomplished: Concurrently with accomplishing the requirements of paragraph (g) of this AD, do wiring changes in the P110 and P210 panels, in accordance with the applicable Accomplishment Instructions of GE Aviation Service bulletin 5000ELM-28-075, Revision 1, dated August 5, 2014; and GE Aviation Service Bulletin 6000ELM-28-076, Revision 1, dated August 5, 2014.
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
