94-15-18: Structural Inspection

94-15-18 BOEING: Amendment 39-8989. Docket 93-NM-174-AD. Supersedes AD 93-06-01, Amendment 39-8526. \n\n\tApplicability: Model 747 series airplanes, as listed in Section 3.0 of Boeing Document No. D6-35022, Volumes 1 and 2, "Supplemental Structural Inspection Document (SSID) for Model 747 Airplanes," Revision E, dated June 17, 1993; and manufacturer's line numbers 42, 174, 221, 231, 234, 239, 242, and 254; certificated in any category. \n\n\tCompliance: Required as indicated, unless accomplished previously. \n\n\tTo ensure the continued structural integrity of the total Boeing Model 747 fleet, accomplish the following: \n\n\t(a)\tFor airplanes listed in Boeing Document No. D6-35022, Volumes I and II, "Supplemental Structural Inspection Document (SSID)," Revision D, dated February 1992: Within 12 months after May 17, 1993 (the effective date of AD 93-06-01, Amendment 39-8526), incorporate a revision into the FAA-approved maintenance inspection program which provides no less than therequired Damage Tolerance Rating (DTR) for each Structural Significant Item (SSI) listed in Boeing Document No. D6-35022, Revision D, dated February 1992. (The required DTR value for each SSI is listed in the document.) The revision to the maintenance program shall include Sections 5.0 and 6.0 of the SSID and shall be implemented in accordance with the procedures contained in those sections. Revision to the maintenance program shall be in accordance with Revision D of the SSID, until Revision E of the SSID is incorporated into the FAA-approved maintenance inspection program in accordance with the requirements of paragraph (b) of this AD. \n\n\t(b)\tFor airplanes listed in Boeing Document No. D6-35022, Volumes 1 and 2, "Supplemental Structural Inspection Document (SSID) for Model 747 Airplanes," Revision E, dated June 17, 1993; and manufacturer's line numbers 42, 174, 221, 231, 234, 239, 242, and 254: Within 12 months after the effective date of this AD, replace the revision of the FAA-approved maintenance inspection program required by paragraph (a) of this AD with a revision that provides no less than the required DTR for each SSI listed in Boeing Document No. D6-35022, Volumes 1 and 2, "Supplemental Structural Inspection Document (SSID) for Model 747 Airplanes," Revision E, dated June 17, 1993. (The required DTR value for each SSI is listed in the document.) The revision to the maintenance program shall include Sections 5.0 and 6.0 of the SSID and shall be implemented in accordance with the procedures contained in those sections. \n\n\t(c)\tCracked structure must be repaired, prior to further flight, in accordance with an FAA-approved method. \n\n\t(d)\tAn alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Seattle ACO. \n\n\tNOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Seattle ACO. \n\n\t(e)\tSpecial flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. \n\n\t(f)\tThe incorporation of the revision shall be done in accordance with Boeing Document No. D6-35022, Volumes 1 and 2, "Supplemental Structural Inspection Document (SSID) for Model 747 Airplanes," Revision E, dated June 17, 1993, which contains the following list of effective pages: \n\n\n\n Page Number\nRevision Letter\nShown on Page \nList of Active Pages\nPages 1 through 21.1 \nE\n\n(NOTE: The issue date is indicated only on the title page of Volume 1.) 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 Airplane Group, 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 Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. \n\n\t(g)\tThis amendment becomes effective on September 12, 1994.