48-44-01 DOUGLAS: Applies to All C-54 and DC-4 Series Aircraft. \n\n\tTo be accomplished not later than March 1, 1949. \n\n\tIn order to preclude nose gear retractions malfunction due to particles of disintegrated packing clogging the present upline orifice fitting, it is necessary to install an orifice fitting having a floating pin in the orifice hole and to replace the present packing used on the retracting cylinder with a more satisfactory packing. To accomplish this change: \n\n\t1.\tReplace the present upline orifice fitting with a union fitting and rework the existing tee fitting to include an orifice fitting (0.063-inch diameter floating pin in 0.090-inch diameter orifice hole) in the pipe threaded end. \n\n\t2.\t(a)\tReplace the existing chevron packing on the nose gear piston assembly with two synthetic chevron packings and two leather chevrons. Install two dural packing rings on each respective end of the piston head. \n\n\t\t(b)\tReplace existing packing on the nose gear cylinder end assembly with one dural packing ring, three synthetic chevron packings, and one leather chevron packing. \n\n\t\t(c)\tInstall two new washers over the end of the cylinder barrel. \n\n\t(Douglas Service Bulletin DC-4 No. 78 dated May 4, 1948 covers this same subject.)