71-01-05 MCDONNELL DOUGLAS: Amdt. 39-1140. Applies to DC-9 series airplanes certificated in all categories. \n\n\tCompliance required within the next 500 hours time in service after the effective date of this AD, unless already accomplished. \n\n\tTo prevent failures in the deployment of the emergency evacuation slide, accomplish the following: \n\n\t(a)\tModify the Douglas Aircraft Company P/N 3753213-39 latch clip in accordance with Douglas Aircraft Company All Operators Letter (AOL) 9-370, dated November 17, 1969, or Revision A thereto, dated November 19, 1970, or later FAA approved revisions, to provide a notch in the latch clip at the point of interference with the clevis pin in the swaged head of the emergency evacuation slide deployment cable assembly, or \n\n\t(b)\tReplace Douglas P/N 3753213-39 latch clip with Douglas P/N 3753213-99 latch clip, or \n\n\t(c)\tAn equivalent modification approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\tThis amendment becomes effective February 17, 1971.