{"id":"F2006B10910","name":"AD/JETSTREAM/41 - Cabin Fire Extinguisher","slug":"ad-jetstream-41-cabin-fire-extinguisher","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56448,"registerId":"commonwealth-F2006B10910-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/41 - Cabin Fire Extinguisher","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBritish Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\nAD/JETSTREAM/41 Cabin Fire Extinguisher 4/91\n\nApplicability: 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.\n\nRequirement: Action in accordance with Mandatory Fire Fighting Enterprises (UK) Ltd SB A26- 106.\n\nNote: UK CAA AD 018-10-90 and BAe Jetstream SB 26-A-JA 901044 refer.\n\nCompliance: 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).\n\nBackground: 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.\n\nCompliance time required by the UK CAA extended by four months.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific manufacturing defect in specific aircraft. It has not expanded beyond its original purpose of ensuring cabin fire extinguisher reliability."},"complexity_factors":["Single, specific applicability (two aircraft models, one manufacturer, specific date range)","Clear, singular requirement referencing an external technical document","Simple two-part compliance deadline structure","Minimal cross-referencing (only two related documents mentioned in notes)","No defined terms section, no conditional logic, no nested exceptions","Short document (approximately 200 words)"],"plain_english_summary":"This mandatory Airworthiness Directive covers British Aerospace Jetstream 3100/3200 aircraft fitted with Fire Fighting Enterprises (UK) portable cabin extinguishers made 1985–mid‑1990, which may have a discharge‑head defect causing accidental discharge or failure. Operators must follow Service Bulletin A26‑106; Australian authorities extended compliance deadlines to 31 May 1991 and 31 August 1991."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope matches its stated intent: mandate corrective action on specified cabin extinguishers per the manufacturer’s service bulletin. The only substantive timing change recorded is an extension of the compliance window by the UK CAA; there is no change to applicability or required actions."},"complexity_factors":["Narrow applicability to specific airframe models and extinguisher manufacture dates (Applicability).","Technical root cause: adverse tolerances in the Discharge Head Assembly risking frangible plug breakage (Background).","Obligation is to follow a manufacturer Service Bulletin rather than prescribing detailed steps in the directive (Requirement: SB A26-106).","Two staged compliance deadlines for different actions increase scheduling complexity for operators (Compliance).","Cross-references to UK CAA AD and BAe Service Bulletin add regulatory linkage to foreign authority documents (Note).","Compliance-burden falls on aircraft owners/operators to implement inspections/repairs and meet dates (Requirement/Compliance).","Regulatory timing altered by an external authority: UK CAA extended compliance time by four months (last line), creating a coordination point."],"plain_english_summary":"This airworthiness directive requires operators of British Aerospace Jetstream 3100/3200 aeroplanes fitted with Fire Fighting Enterprises (UK) portable cabin extinguishers (manufactured 1985–1990, week 31 inclusive) to carry out inspection/rectification steps set out in the manufacturer’s Service Bulletin A26‑106. It responds to a manufacturing tolerance defect that can fracture a syphon-tube frangible plug and allow extinguishant to escape. Operators must comply by the manufacturer-specified dates (31 May 1991 and 31 August 1991)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-41-cabin-fire-extinguisher","history":"/api/acts/ad-jetstream-41-cabin-fire-extinguisher/history","analysis":"/api/acts/ad-jetstream-41-cabin-fire-extinguisher/analysis","conflicts":"/api/acts/ad-jetstream-41-cabin-fire-extinguisher/conflicts","importantCases":"/api/acts/ad-jetstream-41-cabin-fire-extinguisher/important-cases","documents":"/api/acts/ad-jetstream-41-cabin-fire-extinguisher/documents"}}