Airworthiness Directive · Amendment 39-17354 · Wings
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model 757-200, -200PF, -200CB, and -300 series airplanes, certificated in any category.
We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 757 airplanes. This AD was prompted by reports of fuel leaking from the front spar of the wing through the slat track housing. This AD requires a detailed inspection of the inboard and outboard main slat track downstop assemblies and a torque application to the main track downstop assembly nuts of slat numbers 1 through 10, excluding the outboard track of slats 1 and 10; a detailed inspection of all slat track housings for foreign object debris (FOD) and visible damage; and corrective actions if necessary. We are issuing this AD to detect and correct incorrectly installed main slat track downstop assemblies, which, when the slat is retracted, could cause a puncture in the slat track housing and lead to a fuel leak and potential fire.
Except as required by paragraph (h)(1) of this AD, at the applicable time specified in paragraph 1.E., “Compliance,” of Boeing Special Attention Service Bulletin 757-57-0068, Revision 1, dated July 19, 2011: Do the actions specified in paragraphs (g)(1) and (g)(2) of this AD.
(1) Perform a detailed inspection of the inboard and outboard main track downstop assemblies of slat numbers 1 through 10, excluding the outboard main track downstop assemblies of slat numbers 1 and 10, for correct assembly order and missing or damaged parts; perform a detailed inspection of all slat track housings for foreign object debris, visible damage, and missing parts; and do all applicable corrective actions; in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 757-57-0068, Revision 1, dated July 19, 2011, except as required by paragraphs (h)(1), (h)(2), and (h)(3) of this AD. Do all applicable corrective actions before further flight.
(2) Apply torque to the main track down stop assembly nuts to make sure they have been correctly installed, in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 757-57-0068, Revision 1, dated July 19, 2011.
(1) Where Boeing Special Attention Service Bulletin 757-57-0068, Revision 1, dated July 19, 2011, specifies a compliance time “after the date on this service bulletin,” this AD requires compliance at the specified time after the effective date of this AD.
(2) Where Boeing Special Attention Service Bulletin 757-57-0068, Revision 1, dated July 19, 2011, specifies to contact Boeing for appropriate action: Before further flight, repair the damage using a method approved in accordance with the procedures specified in paragraph (l)(1) of this AD.
(3) Although Boeing Special Attention Service Bulletin 757-57-0068, Revision 1, dated July 19, 2011, specifies the slat can inspections are to occur on the slat cans sequentially, this AD allows for the inspections of the slat cans at locations 1 through 10 to be accomplished in any order, including multiple slat can locations simultaneously, provided that all the instructions of each applicable figure of Boeing Special Attention Service Bulletin 757-57-0068, Revision 1, dated July 19, 2011, are completed in sequence on each slat can.
If any of the conditions specified in paragraph B.3., “Part 3—Appendix A: Inspection Results Report,” of the Accomplishment Instructions of Boeing Special Attention Service Bulletin 757-57-0068, Revision 1, dated July 19, 2011, are found during the inspection required by paragraph (g) of this AD, submit a report of the inspection findings at the applicable time specified in paragraph (i)(1) or (i)(2) of this AD, as specified in Appendix A of Boeing Special Attention Service Bulletin 757-57-0068, Revision 1, dated July 19, 2011, to Boeing through the Boeing Communication System (BCS). The report must include a description of any discrepancies found, the airplane serial number, and the number of landings and flight hours on the airplane.
(1) If the inspection was done on or after the effective date of this AD: Submit the report within 30 days after the inspection.
(2) If the inspection was done before the effective date of this AD: Submit the report within 30 days after the effective date 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.
Aircraft
