AD 93-02-14 ACTIVE

93-02-14 BRITISH AEROSPACE: Amendment 39-8498. Docket 91-NM-24-AD.
Applicability: All Model BAC 1-11 200 and 400 series airplanes, certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

NOTE 1: This AD references British Aerospace Alert Service Bulletin 5-A-PM5987, "Time Limits - Aircraft General - Corrosion Control Programme," Issue 2, dated June 30, 1992, for corrosion tasks, compliance times, and reporting requirements. In addition, this AD specifies inspection and reporting requirements beyond those included in that Service Bulletin. Where there are differences between the AD and the Service Bulletin, the AD prevails.

NOTE 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 Standardization Branch, ANM-113, FAA, Transport Airplane Directorate." 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."

To prevent degradation of the structural capabilities of the airplane due to the problems associated with corrosion damage, accomplish the following:

(a) Except as provided in paragraph (b) of this AD, complete each of the corrosion tasks specified in Appendix 3 of British Aerospace Alert Service Bulletin 5-A-PM5987, "Time Limits - Aircraft General - Corrosion Control Programme," Issue 2, dated June 30, 1992 (hereinafter referred to as "the Service Bulletin"), in accordance with the procedures of the Service Bulletin, and in accordance with the schedule specified in paragraphs (a)(1) and (a)(2) of this AD.

NOTE 3: A "corrosion task," as defined in Appendix 3 of the Service Bulletin, includes inspections; procedures for a corrective action, including repairs, under identified circumstances; application of corrosion inhibitors; and other follow-on actions.

NOTE 4: Corrosion tasks completed in accordance with the Service Bulletin 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.

NOTE 5: Where non-destructive inspection (NDI) methods are employed, in accordance with Appendix 3 of the Service Bulletin, the standards and procedures used must be acceptable to the Administrator in accordance with FAR Section 43.13.

NOTE 6: Procedures identified in the Service Bulletin as "informational only" are not required to be accomplished by this AD.

(1) Complete the initial corrosion task of each "corrosion inspection area" defined in Appendix3 of the Service Bulletin as follows:

(i) For aircraft areas that have not yet reached the "threshold age" (TA) as of one year after the effective date of this AD, initial compliance must occur no later than the TA plus the repetitive (R) interval.

(ii) For aircraft areas that have exceeded the TA as of one year after the effective date of this AD, initial compliance must occur within the R interval for the area, measured from a date one year after the effective date of this AD.

(iii) For airplanes that are 20 years old or older as of one year after the effective date of this AD, initial compliance must occur for all areas within one R interval, or within six years, measured from a date one year after the effective date of this AD, whichever occurs first.

(iv) In all cases, accomplishment 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.NOTE 7: This minimum rate requirement may cause a 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.

(2) Repeat each corrosion task at a time interval not to exceed the R interval specified in the Service Bulletin for that task.

(b) As 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 Service Bulletin; 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.

(1) Any operator complying with paragraph (b) of this AD may use an alternative recordkeeping method to that otherwise 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.

(2) Subsequent to the accomplishment of the initial corrosion task, extensions of R intervals specified in the Service Bulletin must be approved by the FAA.

(c) To 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.

(d) (1) If, as a result of any inspection conducted in accordance with paragraph (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:

(i) Submit a report of that determination to the FAA andcomplete the corrosion task in the affected areas on all Model BAC 1-11 series airplanes in the operator's fleet; or

(ii) Submit to the FAA for approval one of the following:

(A) A proposed schedule for performing the corrosion tasks in the affected areas on the remaining Model BAC 1-11 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

(B) Data substantiating that the Level 3 corrosion found is an isolated occurrence.

NOTE 8: Notwithstanding the provisions of Table 1 of the Service Bulletin, which would permit corrosion that 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.

(2) The 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.

(3) Within 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 BAC 1-11 series airplanes in the operator's fleet.

(e) If, as a result of any inspection after the initial inspection conducted in accordance with paragraph (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.

(f) Before 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:

(1) For 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.

(2) For 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.

(g) Reports of Level 2 and Level 3 corrosion must be submitted at least quarterly to British Aerospace in accordance with Section 2.5 of the Service Bulletin.

NOTE 9: Reporting of Level 2 and Level 3 corrosion found as a result of any opportunity inspections is highly desirable.

(h) 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, Standardization Branch, ANM-113, 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, Standardization Branch, ANM-113.

NOTE 10: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113.

(i) 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.

(j) Reports 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.

(k) The corrosion tasks and reports shall be done in accordance with British Aerospace Alert Service Bulletin 5-A-PM5987, "Time Limits - Aircraft General - Corrosion Control Programme," Issue 2, dated June 30, 1992, which contains the following list of effective pages:

Page Number
Revision Level
Shown on Page
Date
Shown on Page

BULLETIN TEXT, INCLUDING CONTENT CHECKLIST:
1-3, 5-6, 8, 11, 13-14, 19
2
June 30, 1992
4, 7, 9-10, 12, 15-18
1
November 30, 1990

APPENDIX 1:

1-3
2
June 30, 1992
4
1
November 30, 1990

APPENDIX 2:

1
2
June 30, 1992
2
1
November 30, 1990

APPENDIX 3:

1-5, 7-10, 12-14, 16-19,
2
June 30, 1992
23-28, 31-37, 37A, 39-44,

44A, 45-46, 48-55, 58-59,

62, 64-75, 77

6, 11, 15, 20-22, 29-30,
1
November 30, 1990
38, 47, 56-57, 60-61,

63, 76, 78

APPENDIX 4:

2-5, 8-10
2
June 30, 1992
1, 6-7, 11-12
1
November 30, 1990

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 British Aerospace, PLC, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, DC 20041. 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.

(l) This amendment becomes effective on March 19, 1993.