82-03-06 MCDONNELL DOUGLAS: Amendment 39-4311. Applies to McDonnell Douglas Model DC-9-10, -20, -30, -40, -50, and -80 series airplanes, including C-9A, C-9B, and VC-9C airplanes, certificated in all categories, equipped with Kevlar tailcones. Compliance required within the next 900 hours time-in-service from the effective date of this AD, unless already accomplished. To assure proper operation of the tailcone emergency exit release mechanism on aircraft utilizing tailcone assemblies P/N 5910233-505 or P/N 5910233-507, accomplish the following: \n\n\tA.\tReplace or modify the tailcone lock housing as outlined in the Accomplishment Instructions of McDonnell Douglas DC-9 Service Bulletin 53-158 dated July 15, 1981, or later revisions approved by the Chief, Los Angeles Area Aircraft Certification Office, Northwest Mountain Region. \n\n\tB.\tAlternate means of compliance with the AD which provide an equivalent level of safety may be used when approved by the Chief, Los Angeles Area Aircraft Certification Office, Northwest Mountain Region. \n\n\tSpecial flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD. \n\n\tThis Amendment becomes effective March 11, 1982.