47-42-12 DOUGLAS: (Was Mandatory Note 9 of AD-781-1.) Applies to DC-6 Serial Numbers 42866, and 42868 to 42875, Inclusive. \n\nTo be accomplished not later than February 1, 1948. \n\nIn order to provide adequate fastening of the rubber cushions on the reinforcing strap assembly of the astrodome, the following must be accomplished: \n\n1.\tRemove the existing rubber strap cushions, P/N 5249604-36, all traces of cement and adhering rubber from reinforcing strap assembly, P/N 5249604-38. \n\n2.\tButt cushion assembly P/N 2356419 against pad P/N 5249604-42, locate and drill four No. 40 (0.098) holes through strap P/N 5249604-38 and attach with AN 426-AD-3-5 rivets. \n\n3.\tReinstall reinforcing strap assembly P/N 5249604-38, using eight AN 960-D-10L washers and eight AN 365-1032 nuts. \n\n\t(Douglas Service Bulletin DC-6 No. 45 covers this same subject.)