70-06-03\tBOEING 737 SERIES AIRPLANES: Amdt. 39-952. Applies to Boeing 737 series listed in Boeing Service Bulletin 27-1031 dated 22 August 1969 and Revision 2 dated 27 January 1970, or later FAA-approved revisions. \n\n\tCompliance required as indicated. \n\n\tTo provide for proper operation of the takeoff warning system and automatic speed brake retraction system at temperatures down to minus 65 degrees F, accomplish the following: \n\n\t(a)\tWithin 50 hours time in service after the effective date of this AD, unless already accomplished, install a placard in the cockpit in full view of the pilot to read: "DO NOT USE AUTOMATIC SPOILER DEPLOYMENT AT AMBIENT TEMPERATURES BELOW ZERO DEGREES FAHRENHEIT." This placard may be removed when Item (b) is accomplished. \n\n\t(b)\tWithin 1000 hours time in service after the effective date of this AD, unless previously accomplished, replace the takeoff warning switch actuating cam with a modified cam and accomplish the rigging procedures for proper alignment of the power lever knobs in the throttle control system with the warning switch in accordance with Boeing Service Bulletin 27- 1031 dated 2 August 1969, and Revision 2 dated 27 January 1970, or later FAA approved revisions, or an equivalent modification approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\tNOTE: The manufacturer is currently providing AFM revisions to operators relating to the characteristics of the warning system. Operators should incorporate this information in their manuals immediately upon receipt. \n\n\tThis amendment becomes effective on March 13, 1970.