Airworthiness Directive · Amendment 39-16677 · Fuel
The Boeing Company Model 777-200, -200LR, -300, and -300ER Series Airplanes
This AD applies to The Boeing Company Model 777-200, -200LR, -300, and -300ER series airplanes, certificated in any category; as identified in the service information specified in paragraphs (c)(1) and (c)(2) of this AD.
(1) Boeing Service Bulletin 777-28A0038, Revision 1, dated September 20, 2010.
(2) Boeing Service Bulletin 777-28A0037, Revision 2, dated September 20, 2010.
We are adopting a new airworthiness directive (AD) for the products listed above. This AD requires, for certain airplanes, replacing certain boost pump relays with ground fault interrupter (GFI) relays. For certain other airplanes, this AD requires installing new panels in the main equipment center, making certain wiring changes, installing new GFI relays in the new panels, and installing new electrical load management system (ELMS) software. For certain other airplanes, this AD requires doing certain bond resistance measurements, and corrective actions if necessary. This AD was prompted by fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent potential ignition sources inside fuel tanks, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Note 1: AD 2008-11-13 requires a revision of the Airworthiness Limitations (AWLs) section of the Instructions for Continued Airworthiness to include limitations for the fuel tank systems. One of the limitations, AWL 28-AWL-18, requires a repetitive inspection of the ground fault interrupter (GFI) functions.
For Groups 1 and 2 airplanes identified as Configuration 2 in Boeing Service Bulletin 777-28A0037, Revision 2, dated September 20, 2010: Within 36 months after the effective date of this AD, install new panels, P301 and P302, in the main equipment center; make certain wiring changes; install new GFI relays in the P301 and P302 panels; and install new electrical load management system (ELMS) software; as applicable. Do the applicable actions in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-28A0037, Revision 2, dated September 20, 2010, except as specified in paragraph (j) of this AD.
Note 2: Boeing Service Bulletin 777-28A0039, Revision 2, dated September 20, 2010, is an additional source of guidance for installing ELMS software.
Note 3: Smiths Service Bulletin 5000ELM-28-454, dated August 13, 2007; and GE Aviation Service Bulletin 6000ELM-28-455, Revision 1, dated February 1, 2010; are additional sources of guidance for making a wiring change in the P110 and P210 panels, respectively.
(h) For Groups 1 and 2 airplanes identified as Configuration 1 in Boeing Service Bulletin 777-28A0037, Revision 2, dated September 20, 2010: Within 36 months after the effective date of this AD, do bonding resistance measurements to verify bonding requirements as specified in Boeing Service Bulletin 777-28A0037, Revision 2, dated September 20, 2010, are met, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-28A0037, Revision 2, dated September 20, 2010.
(i) For airplanes identified in Boeing Service Bulletin 777-28A0038, Revision 1, dated September 20, 2010: Within 60 months after the effective date of this AD, replace 4 main tank boost pump relays in electrical load management system panels P110, P210, and P320 with new GFI relays, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-28A0038, Revision 1, dated September 20, 2010, except as specified in paragraph (j) of this AD.
Note 4: Boeing Service Bulletin 777-28A0038, Revision 1, dated September 20, 2010, references the service bulletins identified in Table 1 of this AD as additional sources of guidance for replacing the main tank boost pump relays.
| Group number of airplanes, as identified in Boeing Service Bulletin 777-28A0038, Revision 1, dated September 20, 2010 | Panel No. | Service bulletin | Revision level | Date |
|---|---|---|---|---|
| Group 1 | P110 | Smiths Service Bulletin 5000ELM-28-443 | Original | August 8, 2007. |
| Group 1 | P210 | Smiths Service Bulletin 6000ELM-28-444 | Original | August 8, 2007. |
| Group 1 | P320 | Smiths Service Bulletin 4000ELM-28-445 | Original | August 8, 2007. |
| Group 2 | P110 | GE Aviation Service Bulletin 5000ELM-28-446 | 1 | January 7, 2010. |
| Group 2 | P210 | Smiths Service Bulletin 6000ELM-28-447 | Original | August 8, 2007. |
| Group 2 | P320 | GE Aviation Service Bulletin 4000ELM-28-448 | 1 | January 7, 2010. |
| Group 3 | P110 | GE Aviation Service Bulletin 5000ELM-28-449 | 1 | January 7, 2010. |
| Group 3 | P210 | Smiths Service Bulletin 6000ELM-28-450 | Original | August 8, 2007. |
| Group 3 | P320 | GE Aviation Service Bulletin 4000ELM-28-451 | 1 | January 7, 2010. |
| Group 4 | P110 | Smiths Service Bulletin 5000ELM-28-463 | Original | August 8, 2007. |
| Group 4 | P210 | Smiths Service Bulletin 6000ELM-28-464 | Original | August 8, 2007. |
| Group 4 | P320 | Smiths Service Bulletin 4000ELM-28-465 | Original | August 8, 2007. |
Where Boeing Service Bulletin 777-28A0037, Revision 2, dated September 20, 2010; and Boeing Service Bulletin 777-28A0038, Revision 1, dated September 20, 2010: specify installing a label, an operator's equivalent procedure may be used as a method to indelibly mark the applicable service bulletin number on the panel.
Note 5: Additional guidance on indelibly marking the panel may also be found in Boeing Standard BAC5307.
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
