65-13-01 BOEING: Amdt. 39-81 Part 39 Federal Register June 15, 1965. Applies to Models 707 and 720 Series Aircraft. \n\n\tCompliance required as indicated unless already accomplished. \n\n\tService experience has shown the need for certain modifications in the horizontal stabilizer trim control and position warning systems. Accordingly, accomplish the following: \n\n\t(a) Within 3,000 hours' time in service after the effective date of this AD: \n\n\t\t(1) On Models 707 and 720 Series airplanes listed in Boeing Service Bulletin No. 1699(R-1)B, modify stabilizer trim green band rigging and limit in accordance with Boeing Service Bulletin No. 1699 (R-1)B, or later FAA-approved revision, or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\t\t(2) On Model 707 Series airplanes listed in Boeing Service Bulletin No. 1990, modify stabilizer trim electrical limit in accordance with Boeing Service Bulletin No. 1990, or later FAA-approved revision, or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\t(b) Within 5,000 hours' time in service after the effective date of this AD: \n\n\t\t(1) On all Models 707 and 720 Series airplanes, modify stabilizer trim actuator moisture control in accordance with Boeing Service Bulletins Nos. 1854 and 1854A, or later FAA-approved revision, or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\t\t(2) On all Models 707 and 720 Series airplanes, modify actuator assembly secondary brake in accordance with Boeing Service Bulletin No. 1946(R-1), or later FAA- approved revision, or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\tThis directive effective July 15, 1965. \n\n\tRevised August 14, 1965. \n\n\tRevised October 20, 1965.