47-33-03 BEECH: (Was Mandatory Note 5 of AD-757-2 and Mandatory Note 4 of AD- 582-2.) Applies to AT-11 and C18S Aircraft. \n\n\tTo be accomplished prior to certification or, if certificated, on next periodic inspection but not later than November 1, 1947. \n\n\tIn order to provide better tail cone drainage, add two drain holes in the tail cone and two 1/4-inch drain holes in the fuselage bulkhead No. 15 as shown in Figure 2. \n\n\n\n\n\t(Beech Service Bulletin No. C18-7 covers this same subject.)