78-01-11 MCDONNELL DOUGLAS: Amendment 39-3116. Applies to all passenger and passenger/cargo Model DC-9 airplanes certificated in all categories, including C-9A, C-9B and VC-9C. \n\n\tCompliance required within 180 days from the effective date of this AD, unless already accomplished. \n\n\tTo identify the location and operation of the tail cone emergency exit release handle, accomplish the following: \n\n\tModify the tail cone emergency exit release handle locating and operating markings in accordance with McDonnell Douglas Service Bulletin 53-134, Revision 1, dated December 16, 1977 or later FAA approved revision, or an equivalent modification approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\tThis Amendment becomes effective February 13, 1978.