Airworthiness Directive · Amendment 39-17916 · Fuel
the Boeing Company Airplanes
This AD applies to The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP series airplanes; certificated in any category; as identified in Boeing Service Bulletin 747-28-2315, dated January 11, 2012.
We are superseding Airworthiness Directive (AD) 89-12-10, for certain The Boeing Company Model 747 airplanes. AD 89-12-10 required replacement of certain underwing fuel tank access doors with stronger, fire-resistant doors. This new AD requires inspecting certain fuel tank access doors for installation of impact-resistant doors, and stencils and index markers; corrective actions if necessary; revising the maintenance program to incorporate certain new airworthiness limitations; and adding airplanes to the applicability. This AD was prompted by a report of a standard access door installed instead of an impact-resistant access door and stencils missing from some impact- resistant access doors and adjacent wing skin. We are issuing this AD to prevent foreign object penetration of the fuel tank, which could cause a fuel leak near an ignition source (e.g., hot brakes or engine exhaust nozzle), consequently leading to a fuel-fed fire.
Within 72 months after the effective date of this AD, do the actions specified in paragraphs (g)(1) and (g)(2) of this AD, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 747-28-2315, dated January 11, 2012.
(1) Do either a general visual inspection or ultrasonic non-destructive test of the left- and right-hand wing fuel tank access doors to determine whether impact-resistant access doors are installed in the correct locations. If any standard access door is found, before further flight, replace with an impact-resistant access door, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 747-28-2315, dated January 11, 2012.
(2) Do a general visual inspection of the left- and right-hand wing fuel tank impact-resistant access doors and adjacent wing skin to verify stencils and index markers are applied. If a stencil or index marker is missing, before further flight, apply a stencil or index marker, as applicable, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 747-28-2315, dated January 11, 2012.
Within 60 days after the effective date of this AD, do the actions specified in paragraphs (h)(1) or (h)(2) of this AD, as applicable.
(1) For Model 747-400, -400D, and -400F series airplanes: Revise the maintenance program to incorporate Critical Design Configuration Control Limitation (CDCCL) Task 57-AWL-01, “Impact-Resistant Fuel Tank Access Doors,” of Sub-section B.2, “Impact-Resistant Fuel Tank Access Doors,” of Section B, “Airworthiness Limitations (AWLs)—Fuel Systems,” of Section 9, Airworthiness Limitations (AWLs) and Certification Maintenance Requirements (CMRs) D621U400-9, of the Boeing 747-400 Maintenance Planning Data (MPD) Document D621U400-9, Revision August 2012.
(2) For Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SR, and 747SP series airplanes: Revise the maintenance program to incorporate CDCCL Task 57-AWL-01, “Impact-Resistant Fuel Tank Access Doors,” of Sub-section C.2, “Impact-Resistant Fuel Tank Access Doors,” of Section C, “Airworthiness Limitations—Fuel Systems,” of the Boeing 747-100/200/300/SP Airworthiness Limitations (AWLs) and Certification Maintenance Requirements (CMRs) Document D6-13747-CMR, Revision August 2012.
After accomplishing the revisions required by paragraph (h) of this AD, no alternative actions (e.g., inspections), intervals, and/or CDCCLs may be used unless the actions, intervals, and/or CDCCLs are approved as an alternative method of compliance (AMOC) in accordance with the procedures specified in paragraph (j) of this AD.
