92-27-04 BOEING: Amendment 39-8437. Docket 92-NM-89-AD. \n\n\tApplicability: Model 747 series airplanes; as listed in Section 4 of Boeing Document Number D6-35999, "Aging Airplane Service Bulletin Structural Modification and Inspection Program," Revision C, dated January 21, 1992; certificated in any category. \n\n\tCompliance: Required as indicated, unless accomplished previously. \n\n\tTo prevent degradation of the structural capability of the airplane, accomplish the following: \n\n\tNOTE: Refer only to Section 4 of Boeing Document D6-35999; the appendices are not the subject of this AD. \n\n\t(a)\tExcept as provided in paragraph (e) of this AD, accomplish the inspections specified in Section 4 of Boeing Document No. D6-35999, Revision C, dated January 21, 1992, within the times specified in paragraph (b) of this AD, and thereafter at intervals not to exceed those specified in the corresponding service bulletin for the inspection. \n\n\t(b)\tThe maximum initial inspection times forthe inspections contained in Section 4 of Boeing Document No. D6-35999, Revision C, dated January 21, 1992, shall be the later of the time specified in either paragraph (b)(1) or (b)(2) of this AD: \n\n\t\t(1)\tThe threshold for the inspection time for the inspections specified in the corresponding service bulletin, measured as a total (flight cycles, time-in-service, as appropriate) accumulated on the airplane; or \n\n\t\t(2)\tThe phase-in period for the inspections specified in the corresponding service bulletin, measured from the effective date of this AD. \n\n\t(c)\tIf any of the discrepant conditions identified in the service bulletins are found as a result of the inspections required by this AD, the corresponding corrective actions specified in the service bulletins must be accomplished prior to further flight. \n\n\t(d)\tThe terminating action for each inspection required by paragraph (a) of this AD consists of the accomplishment of the modification specified in the corresponding servicebulletin. \n\n\t(e)\tNotwithstanding the references in Section 4 of Boeing Document No. D6-35999, Revision C, dated January 21, 1992, to the following list of service bulletins, this AD does not require inspections in accordance with those service bulletins: \n\n\nSERVICE BULLETIN NUMBER\nREVISION LEVEL\nSERVICE BULLETIN DATE \n747-27A2253\n4\nJanuary 25, 1990 \n747-32-2190\n4\nOctober 26, 1989 \n747-53-2253\n2\nMarch 29, 1990 \n747-53-2265\n7\nJanuary 25, 1990 \n747-53-2283\n3\nNovember 1, 1989 \n747-53-2289\n1\nJanuary 26, 1989 \n747-52-2186\n4\nOctober 24, 1991 \n747-57-2231\n2\nSeptember 27, 1990 \n\n\t(f)\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(g)\tSpecial flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. \n\n\t(h)\tThe inspections and corrective actions shall be done in accordance with Section 4 of Boeing Document No. D6-35999, Revision C, dated January 21, 1992, which contains the following list of effective pages: \n\n\tNOTE: Except for the title page of the document, no other pages of the document are dated. \n\n\nPage Number\nRevision Level \nShown on Page \na, c, d, d.1, e, f,\n2.0.1, 3.1.1, 3.2.1, \n3.2.2, 3.2.3, 3.3.1, \n3.4.1, 4.0.1, 4.1.1, \n4.2.1, 4.2.2, 4.3.1, \n4.3.2, 4.3.3, 5.1.1, \n5.1.2, A.3.1, B.1.1, \nB.2.1, B.3.1, B.4.1 \nC \n\n\n3.0.1, A.1.1, A.2.1 \nB \n\n\n1.2.2, 5.0.1 \nA \n\n\nb, 1.1.1, 1.2.1, 2.0.2,\n(Original)This incorporation by reference was previously approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51, as of January 20, 1993 (57 FR 59801, December 16, 1992). Copies may be obtained from Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124. 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(i)\tThis amendment is effective January 20, 1993.