COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Eurocopter AS 355 (Twin Ecureuil) Series Helicopters AD/AS 355/20 Engine Fire Extinguishing System 7/86 DM Applicability: All AS355 helicopters equipped with an engine fire extinguishing system fitted in compliance with Aerospatiale modifications AMS N.350A 07.0691, 0692, 1029 and 1043 or embodiment of Aerospatiale AS355 S.B. 26.01. Requirement: To ensure the integrity of the fire extinguishing system, refer to AS355 SB 2601 Revision 2 Figure 5 for correct orientation of wiring and firing squibs. Modify the installation to conform with the referenced SB if required. Note: French A.D. 86-06-26(B) refers. Compliance: Within 30 hours after 9 June 1986. Background: The referenced Service Bulletin contains details which will reduce the possibility of transposing the fire extinguisher bottles firing squibs.