Airworthiness Directive · Amendment 39-14655 · Boeing Model 757 Airplanes
Boeing Model 757 Airplanes
This AD applies to Boeing Model 757-200, -200PF, and -200CB series airplanes as identified in Boeing Service Bulletin 757-28A0076, Revision 1, dated October 20, 2005; and Model 757-300 series airplanes as identified in Boeing Service Bulletin 757-28A0077, Revision 1, dated October 20, 2005; certificated in any category.
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 757 airplanes. This AD requires, for certain airplanes, reworking the spar bonding path and reapplying sealant; and, for certain other airplanes, testing the electrical bond between the engine fuel feed hose and the wing front spar and, if applicable, reworking the spar bonding path and reapplying sealant. This AD also requires, for all airplanes, an inspection to ensure the electrical bonding jumper is installed between the engine fuel feed tube and the adjacent wing station. This AD also requires operators that may have installed an incorrect O-ring to install the correct part and do a re- test. This AD results from fuel system reviews conducted by the manufacturer. We are issuing this AD to prevent arcing or sparking at the interface between the bulkhead fittings of the engine fuel feed tube and the front spar during a lightning strike, which could provide a possible ignition source for the fuel vapor inside the fuel tank and result in a fuel tank explosion.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
The term “service bulletin(s),” as used in this AD, means the Accomplishment Instructions of the following service bulletins, as applicable.
(1) For Model 757-200, -200CB, and -200PF series airplanes: Boeing Service Bulletin 757-28A0076, Revision 1, dated October 20, 2005.
(2) For Model 757-300 series airplanes: Boeing Service Bulletin 757-28A0077, Revision 1, dated October 20, 2005.
For Group 1 airplanes as identified in the service bulletins: Within 60 months after the effective date of this AD, rework the spar bonding path between the end fitting of the fuel feed hose and the front spar, and apply sealant to the hose fitting on the forward and aft side of the front spar and to the fitting and tube coupling on both sides of the dry bay wall, in accordance with the applicable service bulletin.
For Group 2 airplanes as identified in the service bulletins: Within 60 months after the effective date of this AD, do a bonding resistance test between the fuel feed hose and the front spars of the left and right wings, in accordance with the service bulletins.
(1) If the test meets required resistance limits, before further flight, apply sealant to the end fitting of the fuel feed hose on the aft side of the front spar and to the fitting and tube coupling on both sides of the dry bay wall, in accordance with the applicable service bulletin.
(2) If the test does not meet required resistance limits, before further flight, remove any existing sealant at the front spar; rework the spar bonding path between the end fitting of the fuel feed hose and the front spar to meet bonding resistance test requirements; and apply sealant to the end fitting of the fuel feed hose on the forward and aft sides of the front spar, and to the fitting and tube coupling on both sides of the dry bay wall, in accordance with the applicable service bulletin.
(i) For all airplanes as identified in the service bulletins: Within 60 months after the effective date of this AD, perform a general visual inspection and applicable corrective actions to ensure that an electrical bonding jumper is installed between the engine fuel feed tube and the adjacent wing station 285.65 rib in the left and right wing fuel tanks, in accordance with the applicable service bulletin.
For airplanes on which the actions in paragraphs (g) or (h)(2) of this AD were done before the effective date of this AD in accordance with the Accomplishment Instructions of Boeing Alert Service Bulletin 757-28A0076, dated August 27, 2004; and Boeing Alert Service Bulletin 757-28A0077, dated August 27, 2004; as applicable: Within 60 months after the effective date of this AD, replace the O-ring, part number (P/N) MS29513-330 with a new O-ring, P/N MS29513-328, and do a leak test before further flight after reassembly. Do all actions in accordance with Part B of the Accomplishment Instructions of the applicable service bulletin.
Although Boeing Service Bulletin 757-28A0076, Revision 1; and Boeing Service Bulletin 757-28A0077, Revision 1; both dated October 20, 2005, permit operator's equivalent procedures (OEP), this AD would require using the referenced airplane maintenance manuals, except that operators may use their own FAA-approved OEPs to drain the left and right engine fuel tubes, to drain and ventilate the fuel tanks, and to enter the fuel tanks.
Actions done before the effective date of this AD in accordance with Boeing Alert Service Bulletin 757-28A0076 and Boeing Alert Service Bulletin 757-28A0077, both dated August 27, 2004, are acceptable for compliance with the corresponding requirements of paragraphs (g), (h)(1), (h)(2), and (i) 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
