48-11-01 DOUGLAS: Applies to DC-6 Aircraft. \n\n\tTo be accomplished prior to return to service in class B operation-with cabin heating and thermal deicing, including windshield, operative, but with cabin supercharging inoperative. \n\n\tRework must be accomplished in accordance with the following Douglas Co. data: \n\n\t1.\tAccomplish all rework covered by data listed in Note 48-10-01 for class A operation with the exception of the rework outlined in Service Bulletins No. 258, No. 225 and No. 230. Also accomplish paragraphs 1 and 2 but do not accomplish 3 of Note 48-10-01. \n\n\t2.\tRework in accordance with the following must also be accomplished: \n\n\tService Bulletin DC-6 No. 223, Stainless Steel Heater Discharge Ducts and Windshield Anti-Icing Ducts, as revised February 24, 1948. \n\n\tService Bulletin DC-6 No. 38, Heater Fire Warning Switch-Installation of, dated October 6, 1947. \n\n\tService Bulletin DC-6 No. 250, Cabin Heater Shut-Off Control, dated February 19, 1948. \n\n\tService Bulletin DC-6 No. 211, Main Cabin Heater Exhaust-Revision of, as revised February 23, 1948. \n\n\tService Bulletin DC-6 No. 227, Cabin Heater Scoop Segregation, as revised February 24, 1948. \n\n\tService Bulletin DC-6 No. 243, Revise Cabin Heater Ignition Conduit in Boiler Room and Hell-Hole Area, as revised January 26, 1948. \n\n\tService Bulletin DC-6 No. 245, Heater and Buffet Power Cable Conduit, as revised February 24, 1948. \n\n\tThe rework outlined in the data listed above is based upon an airplane which incorporates certain production changes. Therefore, in order to satisfactorily complete the rework required, some aircraft* must also be revised in accordance with the following: \n\n\tService Bulletin DC-6 No. 40, Heater Exhaust Fire Detector-Replacement of, dated September 3, 1947. (Accomplish partially*). \n\n\tService Bulletin DC-6 No. 71, Installation-Oil Trap and Drain, Cabin Heater Combustion Air Duct, dated September 3, 1947. (Accomplish Electrical Phase of Service Bulletin only.) \n\n\tService Bulletin DC-6 No. 96, Windshield De-icing Air Discharge Revision, dated December 22, 1947. \n\n\tService Bulletin DC-6 No. 141, Improvements in DC-6 Cabin Pressure and Cabin Air Conditioning Systems, dated February 19, 1948. \n\n\tService Bulletin DC-6 No. 150, Revision-Cockpit and Windshield Heat Control System and Windshield Air Exhaust, dated December 11, 1947. \n\n\tService Bulletin DC-6 No. 160, Cabin Air Mixing Valve Actuator, dated February 2, 1948. \n\n\tService Bulletin DC-6 No. 179, Ground Blower Electrical Wiring Revision, dated December 29, 1947. \n\n\tService Bulletin DC-6 No. 28, Installation of Ammeter and Selector Switch for Functional Check of Pitot and Air Scoop Anti-Icing Heaters, dated August 20, 1947. (Must be accomplished completely except that P/N 3320167-516 nameplate, 1 required, shall be deleted.) \n\n\tIn addition to the above, the following must also be accomplished in all aircraft: \n\n\t(a)\tDisconnect the superchargers and drain and flushsupercharger oil system. \n\n\t*Serial numbers of airplanes affected by this rework are listed on the pertinent Service Bulletin(s). Also, additional information may be obtained from the "Supplement" to "Cross Reference List-Service Changes and Modification Items" which has been prepared and revised by the Douglas Co. as of February 11, 1948.