93-11-07 MCDONNELL DOUGLAS: Amendment 39-8597. Docket 92-NM-132-AD. \n\n\tApplicability: Model DC-6, DC-6A, DC-6B, C-118A, and R6D-1 series airplanes; certificated in any category. \n\n\tCompliance: Required as indicated, unless accomplished previously. \n\n\tTo ensure the continuing structural integrity of these airplanes, accomplish the following: \n\n\t(a)\tExcept as provided by paragraph (b) of this AD, inspect each Principal Structural Element (PSE) defined in Chapter 1, Section 6, and Chapter III, of McDonnell Douglas Corporation Report No. L26-014, DC-6 Supplemental Inspection Document (SID), dated January 1992 (hereafter referred to as "the SID"), in accordance with the non-destructive inspection (NDI) methods set forth in Chapter II of the SID, and in accordance with the schedule specified in paragraphs (a)(1) and (a)(2) of this AD: \n\n\t\t(1)\tComplete the initial inspection of each PSE specified in Chapter I, Section 6, and Chapter III of the SID as follows: \n\n\t\t\t(i)\tFor PSE's that have not yet reached their inspection threshold as of one year after the effective date of this AD, the initial inspection must be accomplished no later than the threshold specified. \n\n\t\t\t(ii)\tFor PSE's that have exceeded their inspection threshold as of one year after the effective date of this AD, the initial inspection must be accomplished within on repeat (R) interval for the PSE, measured from a date one year after the effective date of this AD. \n\n\t\t(2)\tSubsequent inspections must be accomplished at intervals not to exceed the intervals specified in Chapter III, Section 1, of the SID for the specific NDI sequence code used at the previous inspection. \n\n\t(b)\tAs an alternative to the requirements of paragraph (a) of this AD: Within one year after the effective date of this AD, incorporate a revision into the FAA-approved maintenance inspection program which provides for inspection of the PSE's defined in Chapter I, Section 6, and Chapter III of the SID. The NDI techniques set forth in the SID provide acceptable methods for accomplishing the inspections required by this AD. \n\n\t(c)\tDiscrepant structure detected during the inspections required by this AD must be replaced or repaired prior to further flight, in accordance with the McDonnell Douglas DC-6 Structural Repair Manual; or in accordance with data approved by the Manager, Los Angeles Aircraft Certification Office, FAA, Transport Airplane Directorate. \n\n\t(d)\tAll inspection results (positive or negative) must be reported to the McDonnell Douglas Corporation in accordance with the instructions in the SID. Information collection requirements contained in this regulation have been approved by the Office of Management and Budget (OMB) under the provisions of the Paperwork Reduction Act of 1980 (44 U.S.C. 3501 et seq.) and have been assigned OMB Control Number 2120-0056. \n\n\t(e)\tAn alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safetymay be used if approved by the Manager, Los Angeles 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, Los Angeles ACO. \n\n\tNOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Los Angeles ACO. \n\n\t(f)\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(g)\tThe inspections and reporting requirements shall be done in accordance with McDonnell Douglas Corporation Report No. L26-014, DC-6 Supplemental Inspection Document (SID), dated January 1992. 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 McDonnell Douglas Corporation, P.O. Box 1771, Long Beach, California 90846-1771, Attention: Business Unit Manager, Technical Publications - Technical Administrative Support, C1-L5B. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Los Angeles Aircraft Certification Office (ACO), 3229 East Spring Street, Long Beach, California; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. \n\n\t(h)\tThis amendment becomes effective on July 22, 1993.