Airworthiness Directive · Amendment 39-18225 · Wings
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 777-200, 777-200LR, 777-300ER, and 777F series airplanes, certificated in any category, as identified in Boeing Service Bulletin 777-57A0097, Revision 1, dated May 4, 2015.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777-200, 777-200LR, 777-300ER, and 777F series airplanes. This AD was prompted by a report indicating that sealant might not have been applied in production to the wing skin panel gaps above certain underwing fittings. This AD would require an inspection for missing sealant, and applicable other specified, related investigative, and corrective actions. We are proposing this AD to detect and correct missing sealant from the wing skin panel gaps above the underwing fittings, which could result in corrosion and fatigue cracking in the wing skin panel, and consequent loss of limit load capability of the wing skin and potential subsequent structural failure of the wings.
At the applicable time specified in paragraph 1.E., “Compliance,” of Boeing Service Bulletin 777-57A0097, Revision 1, dated May 4, 2015, except as required by paragraph (h)(1) of this AD: Do a detailed inspection for missing sealant in the wing skin panel gaps above the underwing fittings, and do all applicable other specified, related investigative, and corrective actions, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-57A0097, Revision 1, dated May 4, 2015, except as required by paragraph (h)(2) of this AD. Do all applicable other specified, related investigative, and corrective actions before further flight.
(1) Where Boeing Service Bulletin 777-57A0097, Revision 1, dated May 4, 2015, specifies a compliance time “after the original issue date of this service bulletin,” this AD requires compliance within the specified compliance time after the effective date of this AD.
(2) Where Boeing Service Bulletin 777-57A0097, Revision 1, dated May 4, 2015, specifies to contact Boeing for appropriate action: Repair before further flight using a method approved in accordance with the procedures specified in paragraph (j) of this AD.
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.
