Airworthiness Directive · Amendment 39-17412 · Wings
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 757-200, 757-200PF, and 757-200CB series airplanes, certificated in any category, as identified in Boeing Service Bulletin 757-57-0060, Revision 4, dated December 7, 2012; and Model 757-300 series airplanes, certificated in any category, as identified in Boeing Service Bulletin 757-57-0061, Revision 3, dated December 7, 2012.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 757 airplanes. This AD was prompted by reports that inspections of the wing center section revealed defective, misapplied, or missing secondary fuel vapor barriers on the center fuel tank. This AD requires inspecting for discrepancies and insufficient coverage of the secondary fuel barrier, determining the thickness of the secondary fuel barrier, and corrective actions if necessary. We are issuing this AD to detect and correct defective surfaces and insufficient thickness of the secondary fuel barrier, which could allow fuel leaks or fumes into the pressurized cabin, and allow fuel or fuel vapors to come in contact with an ignition source, which could result in a fire or an explosion.
For Group 1, Group 2, and Group 4, Configuration 1 airplanes, as identified in Boeing Service Bulletin 757-57-0060, Revision 4, dated December 7, 2012; and Group 1 and Group 3, Configuration 1 airplanes, as identified in Boeing Service Bulletin 757-57-0061, Revision 3, dated December 7, 2012: Within 72 months after the effective date of this AD, do a detailed inspection to detect discrepancies of the secondary fuel barrier at the front spar and the upper panel of the wing center section, and if any discrepancy exists, repair before further flight; in accordance with the Accomplishment Instructions of Boeing Service Bulletin 757-57-0060, Revision 4, dated December 7, 2012; or Boeing Service Bulletin 757-57-0061, Revision 3, dated December 7, 2012; as applicable.
For Group 3 airplanes, as identified in Boeing Service Bulletin 757-57-0060, Revision 4, dated December 7, 2012; and Group 2 airplanes, as identified in Boeing Service Bulletin 757-57-0061, Revision 3, dated December 7, 2012: Within 72 months after the effective date of this AD, do a detailed inspection of the front spar to ensure the secondary fuel barrier application covers the minimum area specified in Boeing Service Bulletin 757-57-0060, Revision 4, dated December 7, 2012; or Boeing Service Bulletin 757-57-0061, Revision 3, dated December 7, 2012; as applicable. If the secondary fuel barrier does not cover the minimum specified area, apply more secondary fuel barrier before further flight, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 757-57-0060, Revision 4, dated December 7, 2012; or Boeing Service Bulletin 757-57-0061, Revision 3, dated December 7, 2012; as applicable.
For Group 1, Group 2, and Group 4, Configuration 1, airplanes, as identified in Boeing Service Bulletin 757-57-0060, Revision 4, dated December 7, 2012; and for Group 1 and Group 3, Configuration 1, airplanes, as identified in Boeing Service Bulletin 757-57-0061, Revision 3, dated December 7, 2012: Within 72 months after the effective date of this AD, measure the thickness of the secondary fuel barrier. If the thickness is less than or more than the acceptable limits defined in Boeing Service Bulletin 757-57-0060, Revision 4, dated December 7, 2012; or Boeing Service Bulletin 757-57-0061, Revision 3, dated December 7, 2012; as applicable; apply more secondary fuel barrier or repair before further flight, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 757-57-0060, Revision 4, dated December 7, 2012; or Boeing Service Bulletin 757-57-0061, Revision 3, dated December 7, 2012; as applicable.
For Group 4, Configuration 2, airplanes, as identified in Boeing Service Bulletin 757-57-0060, Revision 4, dated December 7, 2012; and Group 3, Configuration 2, airplanes, as identified in Boeing Service Bulletin 757-57-0061, Revision 3, dated December 7, 2012: Within 72 months, review the maintenance records to determine if there was a minimum of 0.005 inch of new secondary fuel barrier applied, or if the thickness of the secondary fuel barrier cannot be determined from the maintenance records, measure the thickness of the secondary fuel barrier. If the thickness is less than or more than the acceptable limits specified in Boeing Service Bulletin 757-57-0060, Revision 4, dated December 7, 2012; or Boeing Service Bulletin 757-57-0061, Revision 3, dated December 7, 2012; as applicable; apply more secondary fuel barrier or repair before further flight, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 757-57-0060, Revision 4, dated December 7, 2012; or Boeing Service Bulletin 757-57-0061, Revision 3, dated December 7, 2012; as applicable.
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.
