46-39-05 DOUGLAS: (Was Mandatory Note 6 of AD-762-7.) Applies Only to C-54B and Other C-54 Series Airplanes Having the C-54B Fuel System. \n\n\tTo be accomplished not later than December 1, 1946. \n\n\tThe main fuel line supporting brackets at wing Stations 357, 378, and 399 are subject to vibration failure and are to be replaced with redesigned brackets. In addition, the United Carr clips at wing Station 378 are to be replaced by Adel clips. \n\n\t(Douglas Service Bulletin No. DC-4-5 covers this same subject.)