COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Aircraft - General AD/GENERAL/49 Amdt 3 TKK Altimeter Mechanisms Incorporated in Altimeters of Various Brand Names - Modification 7/75 Applicability: All aircraft fitted with altimeters as detailed in the requirement. Requirement: 1. Altimeters Affected :- T.K.K. P/N LA40-1 serial nos. 1091 to 1183; LA40-1A serial nos. 1028-1108; LA42-1A (WE 1067-1) serial nos. 1118 to 1297; LA42-1A (WE 1067-3) serial nos. 1001 to 1018; LA44-1 serial nos. 61150 to 61157, 61379 to 61391, 61547-61563; LA45-1 serial nos. 1003 to 1019, 61158 to 61173; LA71-11 serial nos. 1001 to 1078, 74187 to 74193, 74195 to 74204, 74206 to 74211, 74213 to 74216, 90961 to 90990; LA71-11A serial nos. 1001 to 1093; LA72-11 serial nos. 1001 to 1059, 73369 to 73443, 90891 to 90940, 90941 to 90960. - UNITED INSTRUMENTS P/N 5932-() serial nos. 47851 to 69000; 5934-() serial nos. 70000 to 102000, A1 to A9999, B1 to B9999, and C1 to C2860; Note 1: United Instruments P/N 5932 ( ) Altimeters may be additionally identified as T.K.K. model LA4 T.S.O. C-10b; - United Instruments P/N 5934 ( ) Altimeters may be additional identified as T.K.K. Model LA7 T.S.O. C-10b; Note 2: United Instruments Altimeters may also be identified by various aircraft manufacturers part numbers. Some but not all are: - Beech P/N 50-380094-( ), 50-384119-( ), 58-380011-( ), 58-380012-( ), 58-380041-( ), 100-324056-( ), 169-380073-( ). - Cessna P/N C661011-( ), C661071-( ), C661025- ( ), C661014-( ). - Piper P/N 99009-( ), 450-611( ), 450-694-( ), PS50008-( )-( ), 550-488-( ), 550-489-( ), 550-490-( ), 555-491-( ), 559-492-( ), 550-493-( ), 322-81-03, 322-81-04. - Bell 206-070-263- ( ), 47-711-303-( ). INSTRUMENT AND FLIGHT RESEARCH P/N IFR-41 Serial Nos. 400 to 1939. AIRCRAFT INSTRUMENT AND DEVELOPMENT P/N 13-2100-1; 13-2100-2; 13-2000-4; 13-2000-5, 350-303, 350-304 except that altimeters with "Aerosonic", "Kollsman" or "Conn" imprinted on the case are not applicable. 2. Remove the four "plastic film bearings" bonded to the mechanism assembly and 2.1 Add lubrication and a 6 mm or 1/4 inch white dot adjacent to the nameplate in accordance with the requirements of T.K.K. Service Bulletin SB-74-004-TKK, or SB-74-005-TKK or United Instruments Service Bulletin No. 1 as applicable; or 2.2 Install new top plate assembly and add the letter "A" in accordance with the requirements of TKK Service Bulletin SB-74-007-TKK. Compliance: 1. For aircraft fitted with a single altimeter - before planned IFR operations (including night VMC operations) after 30 September 1975. COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES 2. For aircraft other than above - before 31 March 1976. Note: Aircraft complying with any of the preceding issues of this directive satisfy compliance with this issue of the directive.