Airworthiness Directive · Amendment 39-22329 · Wings
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model 777-200, -200LR, -300, -300ER, and 777F series airplanes, certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 777 airplanes. This AD was prompted by fuel system reviews conducted by the manufacturer. This AD requires, depending on the airplane configuration, installation of Teflon sleeves, cap sealing of fasteners, detailed inspections, and corrective actions. This AD also requires revising the existing maintenance or inspection program, as applicable, to incorporate more restrictive airworthiness limitations (AWLs). The FAA is issuing this AD to address the unsafe condition on these products.
For airplanes identified in Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021: Except as specified in paragraph (h) of this AD, at the applicable times specified in paragraph 1.E., “Compliance,” of Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021, do all applicable actions (i.e., installation of Teflon sleeves, cap sealing of fasteners, detailed inspections, and corrective actions) identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021.
(1) Where Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021, uses the phrase “the revision 5 date of this service bulletin” or “the revision 6 date of this service bulletin,” this AD requires using “the effective date of this AD.”
(2) Where circle symbol 1 of sheet 2 of Figures 172, 173, and 174 of Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021, points to the outboard side of rib no. 9 for the locate and cap seal task or the inspection task, as applicable, in step 1 of sheet 3, for this AD, circle symbol 1 points to the seven fasteners located at the inboard side of rib no. 9 (adjacent to the right side of the identified seven fasteners).
(3) Where circle symbol 1, next to the text “7 locations,” of sheet 2 of Figure 175 and Figure 176 of Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021, points to the outboard side of rib no. 9 for the locate and cap seal task or the inspection task, as applicable, in step 1 of sheet 3, for this AD, circle symbol 1, next to the text “7 locations,” points to the seven fasteners located at the inboard side of rib no. 9 (adjacent to the right side of the identified seven fasteners).
(4) Where circle symbol 1, next to the text “7 locations,” of sheet 4 of Figure 179 and Figure 180 of Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021, points to the outboard side of rib no. 9 for the locate and cap seal task or the inspection task, as applicable, in step 1 of sheet 6, for this AD, circle symbol 1, next to the text “7 locations,” points to the seven fasteners located at the inboard side of rib no. 9 (adjacent to the left side of the identified seven fasteners).
(5) Where Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021, specifies Work Package 28 is applicable to Group 1 through 4, and Group 8, this AD does not require accomplishment of Work Package 28 for Group 1 through 4 only.
(6) For Group 1 through 4 airplanes identified in Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021, on which the actions specified in Work Package 37 of Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021, have been accomplished, the actions specified in Work Package 38 are not required.
(7) Where the Accomplishment Instructions of Boeing Alert Service Bulletin 777-57A0050, Revision 6, dated August 18, 2021, specifies to purge specific fuel tanks (right, left, or center), operators must purge the applicable fuel tank for which access inside the fuel tank is needed to apply cap sealing to the affected fasteners.
Within 60 days after the effective date of this AD, revise the existing maintenance or inspection program, as applicable, to incorporate the information for 28-AWL-31 and 28-AWL-32 specified in Section D, “Airworthiness Limitations-Systems,” including Subsections D.1, of Section 9, Airworthiness Limitations (AWLs) and Certification Maintenance Requirements (CMRs), D622W001-9, dated August 2022, of Boeing 777-200/200LR/300/300ER/777F Maintenance Planning Data (MPD) Document. The initial compliance time for doing airworthiness limitation instructions (ALI) task 28-AWL-32 is at the applicable time specified in paragraph (i)(1) or (2) of this AD:
(1) For airplanes having line number (L/Ns) 1 through 503 inclusive: Within 3,750 days after accomplishment of the actions specified in Boeing Service Bulletin 777-57A0050; within 60 months after the effective date of this AD; or within 3,750 days after the most recent inspection was performed as specified in AWL No. 28-AWL-32; whichever is latest.
(2) For airplanes having L/Ns 504 and subsequent: Within 3,750 days after the date of issuance of the original airworthiness certificate or the date of issuance of the original export certificate of airworthiness; within 60 months after the effective date of this AD; or within 3,750 days after the most recent inspection was performed as specified in AWL No. 28-AWL-32; whichever is latest.
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
