72-17-03 MCDONNELL DOUGLAS: Amdt. 39-1502. Applies to Model DC-8 Series Airplanes, Fuselage Numbers 1 through 551, inclusive, which correspond to the factory serial numbers listed in Douglas Service Bulletin No. 27-247, dated 21 January 1972, or later FAA-approved revisions; and Model DC-9 Series Airplanes, Fuselage Numbers 1 - 19, 21 - 32, 35 - 546, 548 - 638 and 640 which correspond to the factory serial numbers listed in Douglas Service Bulletin No. 27-148, dated 21 January 1972, or later FAA-approved revisions. \n\n\tCompliance required within the next 90 days after the effective date of this AD unless already accomplished. \n\n\tTo detect defective rudder pedal arm casting perform a one-time-only inspection in accordance with: \n\n\t(1)\tFor Model DC-8 airplanes; per Service Bulletin 27-247, dated 21 January 1972, or later FAA-approved revisions or other FAA-approved equivalent inspection, or \n\n\t(2)\tFor Model DC-9 airplanes; per Service Bulletin 27-148, dated 21 January 1972, or later FAA-approved revisions, or other FAA-approved equivalent inspection. \n\n\tReplace any casting that exceeds the defect limits specified in paragraph 2(h) of the Service Bulletins. \n\n\tThis amendment becomes effective on September 16, 1972.