COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES British Aerospace BAe 3100 (Jetstream) Series Aeroplanes AD/JETSTREAM/41 Cabin Fire Extinguisher 4/91 Applicability: Model Jetstream Series 3100 and Series 3200 Aircraft fitted with Fire Fighting Enterprises (UK) Limited cabin portable fire extinguishers manufactured between year 1985 and 1990 Week 31 inclusive. Requirement: Action in accordance with Mandatory Fire Fighting Enterprises (UK) Ltd SB A26- 106. Note: UK CAA AD 018-10-90 and BAe Jetstream SB 26-A-JA 901044 refer. Compliance: As specified in the Requirement Document with a revised date of 31 May 1991 for compliance (1)(a) and 31 August for compliance (1)(b). Background: It has been confirmed by the manufacturer that due to build up of adverse tolerances in the Discharge Head Assy, it may be possible for the Frangible Plug on the syphon Tube Assy to be broken with the Safety Catch down in the secure position. This will allow the extinguishant to escape into the Discharge Head void. Compliance time required by the UK CAA extended by four months.