48-11-02 DOUGLAS: Applies to DC-6 Aircraft. \n\n\tTo be accomplished prior to return to service in class C operation-with cabin supercharging, cabin heating, and thermal deicing including thermal windshield deicing, in operation. \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 Notes 48-10-01 and 48-11-01 for classes A and B operation, including paragraphs 1 and 2 but excluding paragraph 3 of Note 48-10-01, and excluding paragraph (a) of Note 48-11-01. \n\n\t2.\tRework in accordance with the following must also be accomplished: \n\n\tService Bulletin DC-6 No. 258, Cabin Supercharger Revisions and Bearing Oil Control, dated February 13, 1948. (Also, all superchargers must incorporate low sped drive shaft per Douglas Installation Drawing No. 5350684-C.) \n\n\tService Bulletin DC-6 No. 257, Relocation of Cabin Supercharger Oil Cooler, as revised February 18, 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 be revised in accordance with the following: \n\n\tService Bulletin DC-6 No. 13, Installation of an Oil Pressure Warning Switch for each Cabin Supercharger Gear Box, dated August 28, 1947. \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.