Airworthiness Directive · Amendment 39-13957 · Boeing Model 747 Series Airplanes
Boeing Model 747 Series Airplanes
All Model 747 series airplanes, certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to all Boeing Model 747 series airplanes, that requires repetitive inspections of the nacelle strut-to-wing attachment structure, and repetitive overhaul of the diagonal brace and spring beam load paths, to maintain damage tolerance requirements and ensure long-term structural integrity; and follow-on and corrective actions if necessary. This action is necessary to ensure the structural integrity of the strut-to-wing load path and prevent separation of the strut and engine from the airplane. This action is intended to address the identified unsafe condition.
To ensure the structural integrity of the strut-to-wing load path and prevent separation of the strut and engine from the airplane, accomplish the following:
(a) Where the compliance times for the initial and repetitive baseline and supplemental inspections in the Accomplishment Instructions of Boeing Alert Service Bulletin 747-54A2182, dated July 12, 2001; or Boeing Service Bulletin 747-54A2182, Revision 1, dated January 8, 2004; specify a compliance time interval calculated “from the release of this service bulletin,” this AD requires compliance within the interval specified in the service bulletin “after the effective date of this AD.”
(b) Do the initial and repetitive baseline and supplemental inspections of the nacelle strut-to-wing attachment structure for discrepancies (including cracks, corrosion, or damage; and loose, missing, or broken fasteners), and do the applicable follow-on actions; by doing all the actions in Part 1 through Part 9 of the Work Instructions of Boeing Alert Service Bulletin 747-54A2182, dated July 12, 2001. Do the inspections (including inspections for correct installation of hardware and part numbers) and follow-on actions at the applicable times specified in Figure 1 of the service bulletin.
(c) Do the initial and repetitive overhauls of the diagonal brace and spring beam load paths by doing all the actions in Part 10 and Part 11 of the Work Instructions of Boeing Alert Service Bulletin 747-54A2182, dated July 12, 2001. Do the initial and repetitive overhauls at the applicable times specified in Part 10 and Part 11 of the service bulletin.
(d) Do the initial and repetitive inspections of the fuse pins and secondary pins of the strut-to-wing attachment by doing all the actions in Part 12 of the Work Instructions of Boeing Alert Service Bulletin 747-54A2182, dated July 12, 2001. Do the inspections at the times specified in Part 12 of the service bulletin.
(e) If any discrepancy is found during any inspection required by this AD: Before further flight, do all applicable corrective actions specified in Part 1 through Part 12 of the Work Instructions of Boeing Alert Service Bulletin 747-54A2182, dated July 12, 2001. Do the applicable corrective actions per the service bulletin. If the service bulletin specifies to contact the manufacturer for appropriate action: Before further flight, repair per a method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, or per data meeting the type certification basis of the airplane approved by an Authorized Representative for the Boeing Delegation Option Authorization Organization who has been authorized by the Manager, Seattle ACO, to make such findings.
(f) As an option, paragraphs (b) through (e) of this AD may be done in accordance with Part 1 through Part 12, as applicable, of the Work Instructions of Boeing Service Bulletin 747-54A2182, Revision 1, dated January 8, 2004, at the applicable times specified in the service bulletin. If any action specified in paragraphs (b) through (e) of this AD is done in accordance with Revision 1 of the service bulletin, do all of the actions specified in paragraphs (b) through (e) of this AD and the additional actions specified in paragraph (g) of this AD, in accordance with Revision 1 of the service bulletin. If the service bulletin specifies to contact the manufacturer for appropriate action: Before further flight, repair per a method approved by the Manager, Seattle ACO, FAA, or per data meeting the type certification basis of the airplane approved by an Authorized Representative for the Boeing Delegation Option Authorization Organization who has been authorized by the Manager, Seattle ACO, to make such findings.
(g) If, as an option, any action specified in paragraphs (b) through (e) of this AD is done in accordance with Boeing Service Bulletin 747-54A2182, Revision 1, dated January 8, 2004, of the service bulletin, do a detailed inspection of all strut-to-wing attach joints to determine the part number of any dual side link fuse pin; and install the correct fuse pin if any incorrect fuse pin is found; by doing all of the actions specified in the “Initial Base Line Inspection Requirements” of the Work Instructions of Revision 1 of the service bulletin. Do these actions at the applicable times specified in Revision 1 of the service bulletin.
Note 1: For the purposes of this AD, a detailed inspection is “An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirror, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required.”
(h) Although the service bulletins referenced in this AD specify to submit certain information to the manufacturer, this AD does not include that requirement.
(i)(1) In accordance with 14 CFR 39.19, the Manager, Seattle ACO, FAA, is authorized to approve AMOCs for this AD.
(2) An AMOC that provides an acceptable level of safety may be used for a repair required by this AD, if it is approved by an Authorized Representative for the Boeing Delegation Option Authorization Organization who has been authorized by the Manager, Seattle ACO, to make such findings.
(j) Unless otherwise specified in this AD, the actions shall be done in accordance with Boeing Alert Service Bulletin 747-54A2182, dated July 12, 2001. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124-2207. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call (202) 741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
