75-07-12 MCDONNELL DOUGLAS: Amendment 39-2151. Applies to all Douglas Aircraft Company DC-10-30 series airplanes, certificated in all categories. \n\n\tCompliance required as indicated unless previously accomplished. \n\n\tAfter the effective date of this airworthiness directive do not install Autothrottle/Speed Control Computer Part Number 2593342-910C. \n\n\tNote: Refer to paragraph 2 of McDonnell Douglas DC-10 Service Bulletin No. 22-67 dated February 21, 1975 or later FAA-approved revision. \n\n\tThis amendment becomes effective April 7, 1975.