74-18-01 MCDONNELL DOUGLAS: Amendment 39-1927 as amended by Amendment 39-2533. Applies to all Douglas Aircraft Company DC-10-10/-30/-40 Series airplanes which incorporate Douglas DC-10 Service Bulletin 21-68 or Service Change 1545 when inertial navigation systems are installed. \n\n\tCompliance required as indicated, unless previously accomplished. \n\n\tWithin 300 additional hours time in service after the effective date of this AD, either \n\n\t(1)\tIncorporate in the FAA-approved Airplane Flight Manual, Documents MDC-J1010, MDC-J1030, MDC-J5830, MDC-J1040, and Appendix X of MDC-J1010, the following revision in Section I, Limitations, under the existing heading 'Cabin Pressurization': \n\n\t'For the inertial platform configured airplanes, temporary installation of wiring per Douglas Drawing WBP 9502 must be accomplished for planned unpressurized flight'; or \n\n\t(2)\tIncorporate other airplane flight manual revisions, and/or equipment modification approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\tAmendment 39-1927 became effective August 26, 1974. \n\n\tThis amendment 39-2533 becomes effective March 8, 1976.