89-13-07 McDONNELL DOUGLAS: Amendment 39-6239. \n\n\tApplicability: Model DC-9-81, -82, and -87 series airplanes, equipped with Loral Aircraft Braking Systems main landing gear wheels, Part Number 5004320-2, -3, -4, -5, -6, and -7, certificated in any category. \n\n\tCompliance: Required as indicated, unless previously accomplished. \n\n\tTo prevent wheel failure, accomplish the following: \n\n\tA.\tPrior to the accumulation of 2,000 landings on the wheel or within the next 350 landings after the effective date of this AD, whichever occurs later, unless the wheel was inspected within the last 700 landings, inspect the wheel assembly for cracks in accordance with Loral Service Bulletin MD 81-32-1, MD-82-32-1, and MD-87-32-1, Revision 1, dated November 15, 1988. \n\n\t\t1.\tIf no cracks are found, replace the key boss screws in accordance with the Loral Service Bulletin. \n\n\t\t2.\tIf crack(s) are found, replace the wheel before further flight. \n\n\tB.\tWithin 90 days after the effective dateof this AD, revise the FAA-approved maintenance program to include inspection of the wheel assembly, and replacement, if necessary, as specified in paragraph A., above, at every fourth tire change or every 1,500 landings, whichever occurs first. \n\n\tC.\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. \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 mayobtain copies upon request to Loral Aircraft Braking Systems, 1204 Massillon Road, Akron, Ohio 44306-4186, Attention: Manager of Product Integrity, Mr. J. B. Wright. 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 (39-6239, AD 89-13-07) becomes effective on July 24, 1989.