AD 93-08-07

93-08-07 MCDONNELL DOUGLAS: Amendment 39-8554. Docket 93-NM-25-AD.

Applicability: Model MD-11 series airplanes, manufacturer's fuselage numbers up to and including 532, and 535; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent chafing of the electrical power system control (EPSC) wire assemblies located in the center accessory compartment (CAC), which potentially could result in a fire, accomplish the following:

(a) Within 60 days after the effective date of this AD, perform a one-time visual inspection to detect chafing or preload in the EPSC wire assemblies located in the forward cargo, aft bulkhead area of the CAC, and to determine if clamps and spacers are properly installed, in accordance with McDonnell Douglas Alert Service Bulletin A24-64, dated March 29, 1993.

(1) If no chafing or preload is detected, and a clamp and spacer are installed, no further action is required by this AD.

(2)If no chafing or preload is detected, but the clamp and/or spacer are missing, prior to further flight, modify the wire assembly in accordance with "Condition I" of the Accomplishment Instructions of the service bulletin.

(3) If chafing or preload is detected, and the clamp and spacer are installed, prior to further flight, modify the wire assembly in accordance "Condition II" of the Accomplishment Instructions of the service bulletin.

(4) If chafing or preload is detected, and the clamp and/or spacer are missing, prior to further flight, modify the wire assembly in accordance with "Condition III" of the Accomplishment Instructions of the service bulletin.

(b) Within 30 days after accomplishing the one-time visual inspection required by paragraph (a) of this AD, submit a report of the results, both positive and negative, to the Manager, Los Angeles Aircraft Certification Office (ACO), ANM-100L, FAA, Transport Airplane Directorate, 3229 East Spring Street, Long Beach,California 90806-2425, or fax (310) 988-5210. 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.

(c) 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, Los Angeles 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.

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

(d) 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.

(e) The inspection and modification shall be done in accordance with McDonnell Douglas Alert Service Bulletin A24-64, dated March 29, 1993. 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, Transport Airplane Directorate, Los Angeles Aircraft Certification Office, 3229 East Spring Street, Long Beach, California; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(f) This amendment becomes effective on May 11, 1993.