Airworthiness Directive · Amendment 39-16358 · Wings
The Boeing Company Model 777 Airplanes
This AD applies to The Boeing Company Model 777-200, -200LR, -300, and -300ER airplanes, certificated in any category; as identified in Boeing Service Bulletin 777-57A0064, Revision 1, dated May 6, 2010.
We are adopting a new airworthiness directive (AD) for certain Model 777 airplanes. This AD requires inspecting the bolt, nut, and downstop of the slat track assembly to determine if the bolt, nut, or stops are missing and to determine if the thread protrusion of the bolt from the nut is within specified limits and parts are correctly installed, and related investigative and corrective actions if necessary. For certain airplanes, this AD also requires inspecting the slat cans at the outboard slat number 3 and 12 outboard main track locations for holes and wear damage, and corrective actions if necessary; and replacing the downstop hardware for the outboard slats number 3 and 12 outboard and inboard main track locations. This AD results from a report of a hole in the inboard main track slat can for outboard slat number 12 on a Model 777 airplane. The hole was caused when the bolt securing the downstop migrated out of the fitting and contacted the slat can. We are issuing this AD to detect and correct damage to the outboard slat main track slat cans, which can allow fuel leakage into the fixed wing leading edge in excess of the capacity of the draining system. Excess fuel leakage could result in an uncontained fire.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
At the applicable time specified in paragraph 1.E., “Compliance,” of Boeing Service Bulletin 777-57A0064, Revision 1, dated May 6, 2010, except as required by paragraph (h) of this AD: Do the applicable actions specified in paragraphs (g)(1) and (g)(2) of this AD.
(1) For all airplanes: Do a detailed inspection of the slat main track stop hardware to determine if the bolt, nut, or stops are missing and to determine if the thread protrusion of the bolt from the nut is within specified limits, and do all applicable related investigative and corrective actions, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-57A0064, Revision 1, dated May 6, 2010, except as required by paragraph (i) of this AD. Do all applicable related investigative and corrective actions at the applicable time specified in paragraph 1.E., “Compliance,” of Boeing Service Bulletin 777-57A0064, Revision 1, dated May 6, 2010, except as required by paragraph (h) of this AD.
(2) For airplanes identified as Group 2 airplanes in Boeing Service Bulletin 777-57A0064, Revision 1, dated May 6, 2010: Do a detailed inspection of the slat cans at the outboard slat number 3 and 12 outboard main track locations for holes and wear damage and do all applicable corrective actions, and replace the downstop hardware for the outboard slats number 3 and 12 outboard and inboard main track locations, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-57A0064, Revision 1, dated May 6, 2010. Do all applicable corrective actions at the applicable time specified in paragraph 1.E., “Compliance,” of Boeing Service Bulletin 777-57A0064, Revision 1, dated May 6, 2010.
Where Boeing Service Bulletin 777-57A0064, Revision 1, dated May 6, 2010, specifies a compliance time after the date on the service bulletin, this AD requires compliance within the specified compliance time after the effective date of this AD.
(i) Where Boeing Service Bulletin 777-57A0064, Revision 1, dated May 6, 2010, specifies measuring torque of the nuts of the slat main track stop hardware of slats 3 and 12, this AD does not require that action for Group 2 airplanes.
Actions accomplished before the effective date of this AD according to Boeing Alert Service Bulletin 777-57A0064, dated March 26, 2009, are considered acceptable for compliance with the corresponding actions specified in 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.
Aircraft
