COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 90 and 65-90 (King Air) Series Aeroplanes AD/BEECH 90/41 Cabin Heater Modification and Aft Fuselage Drainage and Sealing - Modification Applicability: Models 65-90, 65-A90 & B90 with S/Nos. LJ-1 to LJ-484. Requirement: 1. Install a temporary placard on the heater control panel stating: "IF HEATER FAILS TO HEAT, TURN OFF IMMEDIATELY" 2/76 2. Modify cabin heater installation, including the fitment of a cabin heater out light, in accordance with Beechcraft SI No. 0230-412, Revision 3. 3. Modify the aft fuselage in accordance with Beechcraft SI No. 0268-103, Rev. 1. Compliance: For Para. 1 - Within 50 hours' time in service after 27 Feb. 1976. For Para. 2 - Before 1 January 1977. For Para. 3 - Within 100 hours' time in service after 27 Feb. 1976. Note: Temporary placard, para. 1, may be removed when para. 2 is accomplished.