Airworthiness Directive · Amendment 39-21887 · Fuel
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.
The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model 757 airplanes. This AD was prompted by significant changes, including new or more restrictive requirements, made to the airworthiness limitations (AWLs) related to fuel tank ignition prevention and the nitrogen generation system. This AD requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. The FAA is issuing this AD to address the unsafe condition on these products.
Except as provided by paragraphs (h) and (i) of this AD, within 60 days after the effective date of this AD, revise the existing maintenance or inspection program, as applicable, to incorporate the information specified in Section E., “Airworthiness Limitations—Systems,” of the Boeing 757 Maintenance Planning Data (MPD) Document, Section 9, Airworthiness Limitations (AWLs) and Certification Maintenance Requirements (CMRs), D622N001-9, dated September 2020; except this AD does not require incorporation of the information specified in Subsections E.2 and E.4. The initial compliance time for doing the airworthiness limitation instruction (ALI) tasks is at the times specified in paragraphs (g)(1) through (12) of this AD.
(1) For AWL No. 28-AWL-01, “External Wires Over Center Fuel Tank”: Within 120 months after the most recent inspection was performed as specified in AWL No. 28-AWL-01.
(2) For AWL No. 28-AWL-03, “Fuel Quantity Indicating System (FQIS)—Out Tank Wiring Lightning Shield to Ground Termination”: Within 120 months after the most recent inspection was performed as specified in AWL No. 28-AWL-03.
(3) For AWL No. 28-AWL-14, “Main and Center Wing Tank Fueling Shutoff Valve Body and Actuator—Fault Current Bond”: Within 120 months after the most recent inspection was performed as specified in AWL No. 28-AWL-14.
(4) For AWL No. 28-AWL-20, “Center Tank Fuel Override Boost Pump Automatic Shutoff System”: Within 12 months after accomplishment of the actions specified in Boeing Service Bulletin 757-28A0081 or Boeing Service Bulletin 757-28A0082, as applicable; or within 12 months after the most recent inspection was performed as specified in AWL No. 28-AWL-20; whichever occurs later.
(5) For AWL No. 28-AWL-21, “Over-Current and Arcing Protection Electrical Design Features Operation—Boost Pump Ground Fault Interrupter (GFI)”: Within 12 months after accomplishment of the actions specified in Boeing Service Bulletin 757-28A0078 or Boeing Service Bulletin 757-28A0079, as applicable; or within 12 months after the most recent inspection was performed as specified in AWL No. 28-AWL-21; whichever occurs later.
(6) For AWL No. 28-AWL-25, “Motor Operated Valve (MOV) Actuator—Lightning and Fault Current Protection Electrical Bond”: Within 72 months after accomplishment of the actions specified in Boeing Service Bulletin 757-28A0088, or within 72 months after the most recent inspection was performed as specified in AWL No. 28-AWL-25, whichever occurs later.
(7) For AWL No. 28-AWL-26, “Center Tank Fuel Boost Pump Power Failed On Protection System”: Within 12 months after accomplishment of the actions specified in Boeing Service Bulletin 757-28A0105, or within 12 months after the most recent inspection was performed as specified in AWL No. 28-AWL-26, whichever occurs later.
(8) For AWL No. 28-AWL-30, “AC Fuel Pump Fault Current Bonding Jumper Installation, Main and Center Tank”: Within 24 months after the effective date of this AD, or within 72 months after the most recent inspection was performed as specified in AWL No. 28-AWL-30, whichever occurs later.
(9) For AWL No. 28-AWL-33, “Full Cushion Clamps and Teflon Sleeving Installed on Out-of-Tank Wire Bundles Installed on Brackets that are Mounted Directly on the Fuel Tanks”: Within 24 months after the effective date of this AD; or within 144 months after accomplishment of the actions specified in Boeing Service Bulletin 757-57A0064 (Part 2 through Part 10 of the Work Instructions); or within 144 months since the most recent inspection was performed as specified in AWL No. 28-AWL-33; whichever occurs later.
(10) For AWL No. 47-AWL-04, “NGS—NEA Distribution Ducting”: Within 17,300 flight hours after accomplishment of the actions specified in Boeing Service Bulletin 757-47-0001 or Boeing Service Bulletin 757-47-0005, as applicable; or within 17,300 flight hours after the most recent inspection was performed as specified in AWL No. 47-AWL-04; whichever occurs later.
(11) For AWL No. 47-AWL-05, “NGS—Cross Vent Check Valve”: Within 17,300 flight hours after accomplishment of the actions specified in Boeing Service Bulletin 757-47-0001 or Boeing Service Bulletin 757-47-0005, as applicable; or within 17,300 flight hours after the most recent inspection was performed as specified in AWL No. 47-AWL-05; whichever occurs later.
(12) For AWL No. 47-AWL-07, “NGS—Thermal Switch”: Within 48,000 flight hours after accomplishment of the actions specified in Boeing Service Bulletin 757-47-0001 or Boeing Service Bulletin 757-47-0005, as applicable; or within 48,000 flight hours after the most recent inspection was performed as specified in AWL No. 47-AWL-07; whichever occurs later.
During accomplishment of the actions required by paragraph (g) of this AD, the alternative materials specified in paragraphs (h)(1) and (2) of this AD are acceptable.
(1) Where AWL No. 28-AWL-05 identifies wire types BMS 13-48, BMS 13-58, and BMS 13-60, the following wire types are acceptable: MIL-W-22759/16, SAE AS22759/16 (M22759/16), MIL-W-22759/32, SAE AS22759/32 (M22759/32), MIL-W-22759/34, SAE AS22759/34 (M22759/34), MIL-W-22759/41, SAE AS22759/41 (M22759/41), MIL-W-22759/86, SAE AS22759/86 (M22759/86), MIL-W-22759/87, SAE AS22759/87 (M22759/87), MIL-W-22759/92, and SAE AS22759/92 (M22759/92); and MIL-C-27500 and NEMA WC 27500 cables constructed from these military or SAE specification wire types, as applicable.
(2) Where AWL No. 28-AWL-05 identifies TFE-2X Standard wall for wire sleeving, the following sleeving materials are acceptable: Roundit 2000NX and Varglas Type HO, HP, or HM.
During accomplishment of the actions required by paragraph (g) of this AD, the following alternative materials are acceptable: For Model 757-300 series airplanes modified using Aviation Partners Boeing STC ST01518SE, issued March 25, 2005, where AWL No. 28-AWL-18 requires the use of conductive fasteners having Part Number (P/N) BACB30LR4-7, this AD allows the use of conductive fasteners having P/N BACB30LR4-7 and P/N BACB30LR4-9.
After the existing maintenance or inspection program has been revised as required by paragraph (g) of this AD, no alternative actions (e.g., inspections), intervals, or CDCCLs may be used unless the actions, intervals, and CDCCLs are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (l) of this AD.
Accomplishment of the revision required by paragraph (g) of this AD terminates the requirements specified in paragraphs (k)(1) and (2) of this AD for that airplane.
(1) All requirements of AD 2012-12-15.
(2) The requirements in paragraph (i)(2) of AD 2018-20-13.
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
