AD 92-27-04

92-27-04 BOEING: Amendment 39-8437. Docket 92-NM-89-AD.

Applicability: 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.

Compliance: Required as indicated, unless accomplished previously.

To prevent degradation of the structural capability of the airplane, accomplish the following:

NOTE: Refer only to Section 4 of Boeing Document D6-35999; the appendices are not the subject of this AD.

(a) Except 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.

(b) The 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:

(1) The 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

(2) The phase-in period for the inspections specified in the corresponding service bulletin, measured from the effective date of this AD.

(c) If 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.

(d) The terminating action for each inspection required by paragraph (a) of this AD consists of the accomplishment of the modification specified in the corresponding servicebulletin.

(e) Notwithstanding 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:

SERVICE BULLETIN NUMBER REVISION LEVEL SERVICE BULLETIN DATE 747-27A2253 4 January 25, 1990 747-32-2190 4 October 26, 1989 747-53-2253 2 March 29, 1990 747-53-2265 7 January 25, 1990 747-53-2283 3 November 1, 1989 747-53-2289 1 January 26, 1989 747-52-2186 4 October 24, 1991 747-57-2231 2 September 27, 1990

(f) An 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.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Seattle ACO.

(g) Special 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.

(h) The 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:

NOTE: Except for the title page of the document, no other pages of the document are dated.

Page Number Revision Level Shown on Page a, c, d, d.1, e, f, 2.0.1, 3.1.1, 3.2.1, 3.2.2, 3.2.3, 3.3.1, 3.4.1, 4.0.1, 4.1.1, 4.2.1, 4.2.2, 4.3.1, 4.3.2, 4.3.3, 5.1.1, 5.1.2, A.3.1, B.1.1, B.2.1, B.3.1, B.4.1 C

3.0.1, A.1.1, A.2.1 B

1.2.2, 5.0.1 A

b, 1.1.1, 1.2.1, 2.0.2, (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.

(i) This amendment is effective January 20, 1993.