90-01-01 MCDONNELL DOUGLAS: Amendment 39-6431. Docket No. 89-NM-108-AD. \n\n\tApplicability: Model DC-10-30, -30F, -40, and KC-10A (Military) series airplanes, certificated in any category. \n\n\tCompliance: Required as indicated, unless previously accomplished. \n\n\tTo prevent the loss of main landing gear brake effectiveness, accomplish the following: \n\n\tA.\tWithin 90 days after October 14, 1988 (effective date of Amendment 39-6034), replace all Aircraft Braking Systems (formerly Loral Systems, formerly Goodyear) brakes, part numbers 5000758-2, -3, and -5 with Aircraft Braking Systems brakes, part numbers 5000758-4, -6, and -10. The maximum wear limit is 0.75 inch. \n\n\tB.\tWithin 90 days after October 14, 1988 (effective date of Amendment 39-6034), inspect the brakes for wear. Any brake that is worn more than 0.75 inch must be replaced, prior to further flight, with one within this limit. These limits must be maintained until the requirements of paragraphs D. and E., or F. andG., below are accomplished. \n\n\tC.\tWithin 90 days after October 14, 1988 (effective date of Amendment 39-6034), incorporate the 0.75 inch brake wear limit into the FAA-approved maintenance inspection program. \n\n\tD.\tWithin 30 days after the effective date of this amendment, inspect all Aircraft Braking Systems (formerly Loral Systems, formerly Goodyear) brakes, part numbers 5000758-4, -6, and -10, for wear. Any brake worn more than 0.50 inch must be replaced, prior to further flight, with one within this limit. \n\n\tE.\tWithin 30 days after the effective date of this amendment, incorporate the 0.50 inch brake wear limit into the FAA-approved maintenance inspection program for all Aircraft Braking Systems (formerly Loral Systems, formerly Goodyear) brakes, part numbers 5000758-4, -6, and -10. \n\n\tF.\tWithin 180 days after the effective date of this amendment, modify and replace all Aircraft Braking Systems (formerly Loral Systems, formerly Goodyear) brakes, part numbers 5000758-4, -6,and -10, or any brake modified in accordance with AD 88-16-02 R1, Amendment 39-6034, paragraphs C.2. or D.2., with new extra-long piston sleeves and dust seal boots, and reidentify them as -4R, -6R, and -10R brake assemblies, respectively, in accordance with Douglas Aircraft Company DC-10 Service Bulletin Number 32-218, dated March 17, 1989. For Aircraft Braking Systems (formerly Loral Systems, formerly Goodyear) brakes, part numbers 5000758-4R, -6R, and -10R, the maximum wear limit is 0.90 inch. \n\n\tG.\tWhen the modifications required by paragraph F., above, are accomplished, incorporate the 0.90 inch brake wear limit in the FAA-approved maintenance inspection program. \n\n\tH.\tAn alternate means 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, FAA, Northwest Mountain Region. \n\n\tNOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment, and then send it to the Manager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region. \n\n\tI.\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\tAll persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to Douglas Aircraft Company, P.O. Box 1771, Long Beach, California 90801, ATTN: Manager, Service Changes, Mail Code 73-30. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or Los Angeles Aircraft Certification Office, 3229 East Spring Street, Long Beach, California. \n\n\tThis AD supersedes AD 88-16-02 R1, Amendment 39-6034. \n\n\tThis amendment (39-6431, AD 90-01-01) becomes effective on January 31, 1990.