70-16-04\tBOEING: Amdt. 39-1052. Applies to Boeing Model 707/720 Series Airplanes. (Effectivity listed on Boeing Service Bulletin No. 2986 dated May 15, 1970, or later FAA approved revisions). \n\n\tCompliance required within 100 hours time in service after the effective date of this AD unless already accomplished.\n \n\tTo prevent fire caused by failure of the Main Cabin Cove Light Ballast Capacitors deactivate the main cabin cove light circuits until one of the following items has been accomplished: \n\n\t(1)\tRelocate all main cabin ballast capacitors to the inboard side of the cove light race way as described in Boeing Service Bulletin No. 2986 dated May 15, 1970, or later FAA approved revisions. \n\n\t(2)\tPerform an equivalent modification approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\tThis Amendment becomes effective on August 1, 1970.