73-06-01\tBOEING: Amdt. 39-1603. Applies to all Model 727 series airplanes listed in Boeing Service Bulletin 27-129 dated 3 October 1969, or later FAA approved Revisions. \n\tCompliance required as indicated. \n\tTo prevent failures of the leading edge slat actuators, accomplish the following: \n\t(a)\tWithin 3000 landings from the effective date of this AD. \n\t\t(1)\tRework actuators (Ronson Part No. 1U1095) on leading edge slats numbered 1, 2, 7 and 8 in accordance with rework instructions in Boeing Service Bulletin 27-129, dated 3 October 1969, or later FAA approved Revisions, or rework in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region, or \n\t\t(2)\tReplace actuators (Ronson Part No. 1U1095) on slats numbered 1, 2, 7 and 8 with redesigned actuators, Ronson Part Nos. 1U1095-5 or 1U1095-9-2, or replace with actuators, Decoto Part Nos. 2-690029-1, -2, or -3. \n\t(b)\tRework of the actuators, Ronson Part No. 1U1095 in accordance with (a)(1) above orreplacement of the actuators in accordance with (a)(2) above constitutes terminating action under the provisions of this AD. \n\n\tThis amendment becomes effective March 13, 1973.