46-13-05 DOUGLAS: (Was Mandatory Note 10 of AD-618-3 and Mandatory Note 12 of AD-669-3.) Applies to All DC3 Aircraft. \n\n\tTo be accomplished not later than April 1, 1947. \n\n\tReplace all canvas control boot assemblies either with the new rubber control column boot assemblies of the same part number (No. 5035184-16 and -17), as called for on Douglas Service Bulletin No. 231, or with the following boot assemblies: \n\n\t(a)\tThompson Co. (H.I. Thompson Co., 1733 Cordova St., Los Angeles 7, Calif.), No. 11-21001, change B, for Models DC3-C/C-47 and DC-3-D/C117A. \n\n\t(b)\tThompson Co. No. 11-21002, change A, for Model DC3. \n\n\t(c)\tAmerican Airlines Drawing No. CDS-6132. \n\n\tPending replacement, the canvas boots should be inspected prior to each flight to determine that the top of the boot is tight around the control assembly and the pocket around the base is eliminated.