COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Israel Aircraft Industries 1123 and 1124 (Westwind) Series Aeroplanes AD/IAI-W/6 Audio Intercom System - Warning Placard and Modification 5/81 Applicability: All models 1123, 1124 and 1124A with S/Nos. 151 to 315 except 294, 296, 297, 309, 310 and 314. Document: IAI Service Bulletin WW-25 for Model 1123 aeroplanes. IAI Service Bulletin WW- 24-23 for Model 1124 and 1124A aeroplanes. Note: FAA Emergency Airworthiness Directive 81-07-07 dated 20 March 1981 refers. Compliance: Within 100 hours time in service after 31 May 1981. Background: In an incident overseas a resistor in the intercom system overheated and initiated a fire on the ground. A check of Australian aircraft of this type revealed that overheating of the same resistor has occurred but not to the degree necessary to initiate a fire.