92-22-07 MCDONNELL DOUGLAS: Amendment 39-8393. Docket No. 90-NM-165-AD. \n\n\tApplicability: All Model DC-8 series airplanes, certificated in any category. \n\n\tCompliance: Required as indicated, unless accomplished previously. \n\n\tNOTE 1: This AD references McDonnell Douglas Document Number MDC K4608, "DC-8 Corrosion Prevention and Control Document," Revision 1, dated December 1990 hereinafter referred to as "the Document"), for corrosion tasks, definitions of corrosion levels, compliance times, and reporting requirements. In addition, this AD specifies inspection and reporting requirements beyond those included in the Document. Where there are differences between the AD and the Document, the AD prevails. \n\n\tNOTE 2: As used throughout this AD, the term "the FAA" is defined differently for different operators, as follows: For those operators complying with paragraph (a) of this AD, "the FAA" is defined as "the Manager of the Los Angeles Aircraft Certification Office (ACO)."For those operators operating under Federal Aviation Regulation (FAR) Part 121 or 129, and complying with paragraph (b) of this AD, "the FAA" is defined as "the cognizant Principal Maintenance Inspector (PMI)." For those operators operating under FAR Part 91 or 125, and complying with paragraph (b) of this AD, "the FAA" is defined as "the cognizant Maintenance Inspector at the appropriate FAA Flight Standards office." \n\n\tTo preclude structural failure due to corrosion, accomplish the following: \n\n\t(a)\tExcept as provided in paragraph (b) of this AD, complete each of the corrosion tasks specified in Section 4 of the Document in accordance with the procedures of the Document, and the schedule specified in paragraphs (a)(1) and (a)(2) of this AD. \n\n\tNOTE 3: A "corrosion task," as defined in Section 4 of the Document, includes inspections; procedures for a corrective action, including repairs, under identified circumstances; application of corrosion inhibitors; and other follow-onactions. \n\n\tNOTE 4: Corrosion tasks completed in accordance with the Document before the effective date of this AD may be credited for compliance with the initial corrosion task requirements of paragraph (a)(1) of this AD. \n\n\tNOTE 5: Where non-destructive inspection (NDI) methods are employed, in accordance with Section 4 of the Document, the standards and procedures used must be acceptable to the Administrator in accordance with FAR Section 43.13. \n\n\t\t(1)\tComplete the initial corrosion task of each "corrosion inspection area" defined in Section 4 of the Document as follows: \n\n\t\t\t(i)\tInitial compliance must occur for all areas within one repeat (R) interval, or within six years, measured from a date one year after the effective date of this AD, whichever occurs first. \n\n\t\t\t(ii)\tAccomplishment of the initial tasks by each operator must occur at a minimum rate equivalent to one airplane per year, beginning one year after the effective date of this AD. \n\n\tNOTE 6: This minimum rate requirement may cause an undue hardship on some small operators. In those circumstances, requests for adjustments to the implementation rate will be evaluated on a case-by-case basis under the provisions of paragraph (h) of this AD. \n\n\t\t(2)\tRepeat each corrosion task at a time interval not to exceed the R interval specified in the Document for that task. \n\n\t(b)\tAs an alternative to the requirements of paragraph (a) of this AD: Prior to one year after the effective date of this AD, revise the FAA-approved maintenance/inspection program to include the corrosion prevention and control program specified in the Document; or to include an equivalent program that is approved by the FAA. In all cases, the initial corrosion task for each "corrosion inspection area" must be completed in accordance with the compliance schedule specified in paragraph (a)(1) of this AD. \n\n\t\t(1)\tAny operator complying with paragraph (b) of this AD may use an alternative recordkeeping method to thatotherwise required by FAR Section 91.417 or Section 121.380 for the actions required by this AD, provided it is approved by the FAA and is included in a revision to the FAA-approved maintenance/inspection program. \n\n\t\t(2)\tSubsequent to the accomplishment of the initial corrosion task, extensions of R intervals specified in the Document must be approved by the FAA. \n\n\t(c)\tTo accommodate unanticipated scheduling requirements, it is acceptable for an R interval to be increased by up to 10%, but not to exceed 6 months. The FAA must be informed, in writing, of any such extension within 30 days after such adjustment of the schedule. \n\tNOTE 7: Notwithstanding Section 2.1, paragraph 14, of the Document, any extensions to an implementation age (IA) must be approved in accordance with paragraph (h) of this AD. \n\n\t(d)\t(1)\tIf, as a result of any inspection conducted in accordance with paragraphs (a) or (b) of this AD, Level 3 corrosion is determined to exist in any area, accomplish either paragraph (d)(1)(i) or (d)(1)(ii) within 7 days after such determination: \n\n\t\t\t(i)\tSubmit a report of that determination to the FAA and complete the corrosion task in the affected areas on all Model DC-8 series airplanes in the operator's fleet; or \n\n\t\t\t(ii)\tSubmit to the FAA for approval one of the following: \n\t\t\t\t(A)\tA proposed schedule for performing the corrosion tasks in the affected areas on the remaining Model DC-8 series airplanes in the operator's fleet, which is adequate to ensure that any other Level 3 corrosion is detected in a timely manner, along with substantiating data for that schedule; or \n\n\t\t\t\t(B)\tData substantiating that the Level 3 corrosion found is an isolated occurrence. \n\n\tNOTE 8: Notwithstanding the provisions of Section 1 of the Document which would permit corrosion which otherwise meets the definition of Level 3 corrosion (i.e., which is determined to be a potentially urgent airworthiness concern requiring expeditious action) to be treated as Level 1 if the operator finds that it, "can be attributed to an event not typical of the operator's usage of other airplanes in the same fleet," this paragraph requires that data substantiating any such finding be submitted to the FAA for approval. \n\n\t\t(2)\tThe FAA may impose schedules other than those proposed, upon finding that such changes are necessary to ensure that any other Level 3 corrosion is detected in a timely manner. \n\n\t\t(3)\tWithin the time schedule approved under paragraph (d)(1) or (d)(2) of this AD, accomplish the corrosion tasks in the affected areas of the remaining Model DC-8 series airplanes in the operator's fleet. \n\n\t(e)\tIf, as a result of any inspection after the initial inspection conducted in accordance with paragraphs (a) or (b) of this AD, it is determined that corrosion findings exceed Level 1 in any area, within 60 days after such determination a means approved by the FAA must be implemented to reduce future findings of corrosion in that area to Level 1 or better. \n\n\t(f)\tBefore any operator places into service any airplane subject to the requirements of this AD, a schedule for the accomplishment of corrosion tasks required by this AD must be established in accordance with paragraph (f)(1) or (f)(2) of this AD, as applicable: \n\n\t\t(1)\tFor airplanes previously maintained in accordance with this AD, the first corrosion task in each area to be performed by the new operator must be accomplished in accordance with the previous operator's schedule or with the new operator's schedule, whichever would result in the earlier accomplishment date for that task. After each corrosion task has been performed once, each subsequent task must be performed in accordance with the new operator's schedule. \n\n\t\t(2)\tFor airplanes that have not been previously maintained in accordance with this AD, the first corrosion task for each area to be performed by the new operator must be accomplished prior to further flight or in accordance with a schedule approved by the FAA. \n\n\t(g)\tReports of Level 2 and Level 3 corrosion must be submitted at least quarterly to McDonnell Douglas Corporation in accordance with Section 5 of the Document. \n\n\tNOTE 9: Reporting of Level 2 and Level 3 corrosion found as a result of any opportunity inspections is highly desirable. \n\n\t(h)\tAn alternative method of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through the cognizant Maintenance Inspector at the appropriate FAA Flight Standards office, who may concur or comment and then send it to the Manager, Los Angeles ACO. \n\n\tNOTE 10: 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(i)\tSpecial flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. \n\n\t(j)\tReports of corrosion inspection results required by this AD 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(k)\tThe completion of the corrosion tasks shall be done in accordance with McDonnell Douglas Document Number MDC K4608, "DC-8 Corrosion Prevention and Control Document," Revision 1, dated December 1990, which incorporates the following list of effective pages: \n\n\t\t(NOTE: Revision levels are not noted on individual pages.) \n\n\nPage Number\t\nDate Indicated on Page \n\n\nTitle Page\nApril 1990 \nPreface\nUndated \nSum-1\t\nDecember 1990 \nA thru F\t\nUndated \nTable of Contents\t\nUndated \ni thru ii\t\t \nApril 1990 \n1-1-1\t\nApril 1990 \n1-1-2\t\nDecember 1990 \n2-1-1 thru 2-1-2\nDecember 1990\n2-1-3\t\nApril 19902-1-4\t\t\nDecember 1990 \n3-1-1 thru 3-1-2\t\nApril 1990 \n3-2-1\t\nDecember 1990 \n4-1-1 thru 4-2-1\t\t\nDecember 1990 \n4-2-2 thru 4-2-3\nApril 1990 \n4-3-1\t\nDecember 1990 \n4-3-2\t\t \nApril 1990 \n4-4-1\t\nApril 1990\n4-5-1\t\nApril 1990\n4-6-1 thru 4-6-4\t\t\nApril 1990 \n4-7-1 thru 4-7-28\t\nApril 1990 \n5-1-1 \t\t\t\nDecember 1990 \n5-1-2 \t\nApril 1990 \n5-1-3\t\t\t\t\nDecember 1990 \n6-1-1 thru 6-1-9\t\nApril 1990 \nAppendix A (Title Page)\t\nDecember 1990 \nA-1\nDecember 1990 \nA-2 thru A-7\t\nAugust 1990 \nA-8 \t\t\t\nDecember 1990 \nA-9 thru A-12\t\nAugust 1990 \nAppendix B (Title Page)\t\t\nAugust 1990 \n(i thru ii)\t\t\n(Removed) \niii\t\nUndated \n(iv)\t\t\t\n(Removed) \nv thru vi\t\nUndated \n1\t\nUndated \n(2)\t\t\n(Removed) \n3 thru 17\t\t\nUndated\n(18)\t\t\n(Removed) \n19 thru 81\t\nUndated \n(82)\t\t\t\t\n(Removed) \n83 thru 86\nUndated \nAppendix C (Title Page)\t\nDecember 1990 \nC-1-1 \t\t\t\t\nDecember 1990 \nC-2-1 thru C-2-14\nDecember 1990 \nC-3-1 thru C-3-4\t\nDecember 1990 \nC-4-1 thru C-4-2\t\nDecember 1990Appendix D (Title Page) \nAugust 1990 \nD-1\t\t\nAugust 1990 \nGlossary (Title Page)\t\nDecember 1990 \nG-1 thru G-4\nDecember 1990 \nG-5 thru G-6\t\nAugust 1990 \t\n\t\nThis 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 90846-0001, Attention: Business Unit Manager, Technical Publications, C1-HDR (54-60). Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Los Angeles Aircraft Certification Office, FAA, Transport Airplane Directorate, 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(l)\tThis amendment becomes effective on January 12, 1993.