89-26-02 MCDONNELL DOUGLAS: Amendment 39-6418. Docket No. 89-NM-73-AD. \n\n\tApplicability: Model DC-9-10 through -80, Model MD88, and C-9 (Military) series airplanes, certificated in any category. \n\n\tCompliance: Required as indicated, unless previously accomplished. \n\n\tTo preclude failure of the rudder control sector, accomplish the following: \n\n\tA.\tWithin 60 days after the effective date of this airworthiness directive (AD), visually inspect the rudder control sector for cracks and acceptable wall thickness, in accordance with Figure 2 of McDonnell Douglas Alert Service Bulletin A27-302, dated February 17, 1989. \n\n\t\t1.\tIf no cracks are found and the wall thickness is more than .020 inch, no further action is required. \n\n\t\t2.\tIf cracks are found or if a wall thickness of .020 inch or less is found, prior to further flight, perform either a permanent or temporary repair or replace the rudder control sector, in accordance with the accomplishment instructions of McDonnellDouglas Service Bulletin A27-302, dated February 17, 1989. \n\n\t\t3.\tIf a temporary repair is performed, replace or permanently repair the rudder control sector within 6 months or 1,000 landings, whichever occurs earlier, in accordance with McDonnell Douglas Service Bulletin A27-302, dated February 17, 1989. \n\n\tB.\tWithin 15 days after the inspection required by paragraph A., above, submit a report of findings, positive or negative, to the Los Angeles Aircraft Certification Office, Attention: ANM-108L, FAA, Northwest Mountain Region, 3229 East Spring Street, Long Beach, California 90806-2425. \n\n\tC.\tAn alternate means of compliance or adjustment of the compliance times, 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 theManager, Los Angeles Aircraft Certification Office, FAA, Northwest Mountain Region. \n\n\tD.\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 McDonnell Douglas Corporation, 3855 Lakewood Boulevard, Long Beach, California 90846, Attention: Director of Publications, C2-165 (54-60). These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or the Los Angeles Aircraft Certification Office, 3229 East Spring Street, Long Beach, California. \n\n\tThis amendment (39-6418, AD 89-26-02) becomes effective January 13, 1990.