{"id":"F2006B10537","name":"AD/HS 125/94 - Engine Fire Extinguisher Bottle","slug":"ad-hs-125-94-engine-fire-extinguisher-bottle","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116337,"registerId":"commonwealth-F2006B10537-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/94 - Engine Fire Extinguisher Bottle","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  British Aerospace BAe 125 Series Aeroplanes\n\n \n\nAD/HS 125/94 Engine Fire Extinguisher Bottle 8/88\n\nApplicability: All BAe 125 series 700 and 800 and all series retrofitted with Garrett TFE731-3 engines.\n\n \n\nRequirement: Inspect in accordance with BAe Service Bulletin No 26-28. Compliance: Prior to 31 May 1989.\n\nBackground: The investigation by the manufacturer into the inadvertent ground firing of a HTL engine fire extinguisher bottle, revealed that the discharge outlet had separated from the fire extinguisher bottle assembly.\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive focused on a specific mechanical defect. It has not expanded beyond its original purpose of ensuring fire extinguisher bottle integrity on specified aircraft."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined applicability criterion (aircraft series/engine type)","Single, unambiguous requirement (inspect per specified service bulletin)","No cross-references to other legislation or regulations","No conditional logic or nested exceptions","Clear, fixed compliance deadline"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific British Aerospace BAe 125 aircraft to inspect their engine fire extinguisher bottles.\n\n**What it does:**\n- **Mandates an inspection** of fire extinguisher bottles on certain BAe 125 series aircraft (700 and 800 series, plus any retrofitted with Garrett TFE731-3 engines)\n- **Requires compliance** with a specific manufacturer bulletin (BAe Service Bulletin No 26-28)\n- **Sets a deadline:** The inspection must be completed before 31 May 1989\n\n**Why it matters:**\nThe directive was issued after an investigation found that the discharge outlet on these fire extinguisher bottles could separate from the bottle assembly. This could cause the extinguisher to fire accidentally on the ground — a serious safety hazard that could injure ground crew or damage the aircraft. The inspection ensures the bottles are safe before they can fail.\n\n**Who it affects:**\n- Owners and operators of BAe 125 series 700 and 800 aircraft\n- Any BAe 125 aircraft that have been retrofitted with Garrett TFE731-3 engines\n- Maintenance organisations servicing these aircraft"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD’s scope aligns with its stated purpose: to address the risk of an inadvertent discharge caused by separation of the discharge outlet on specified BAe 125 aircraft/engine combinations. The instrument is limited to the listed models and retrofits and requires inspection per the manufacturer’s service bulletin before a specified date. There is no indication in the text that the scope was broadened or narrowed from the directive’s stated intent (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Narrow and specific applicability (only BAe 125 series 700/800 and those retrofitted with Garrett TFE731-3 engines) (Applicability)","Clear, single procedural obligation (inspect per Service Bulletin No 26-28) which reduces legal ambiguity (Requirement)","Firm compliance deadline creates scheduling and operational constraints (Compliance)","Reliance on an external technical document (manufacturer service bulletin) for procedural detail increases practical complexity for operators depending on the bulletin’s clarity (Requirement)","Potential for follow-on corrective work if defects are found introduces uncertain additional costs (Requirement / Background)"],"plain_english_summary":"This AD requires owners/operators of BAe 125 Series 700 and 800 aircraft (and any BAe 125s retrofitted with Garrett TFE731-3 engines) to carry out the inspection in British Aerospace Service Bulletin No. 26-28 of the engine HTL fire extinguisher bottle assembly before 31 May 1989. It aims to detect separation faults that could cause unintended discharge; compliance is legally required and costs/time for inspection and any repairs fall to operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-94-engine-fire-extinguisher-bottle","history":"/api/acts/ad-hs-125-94-engine-fire-extinguisher-bottle/history","analysis":"/api/acts/ad-hs-125-94-engine-fire-extinguisher-bottle/analysis","conflicts":"/api/acts/ad-hs-125-94-engine-fire-extinguisher-bottle/conflicts","importantCases":"/api/acts/ad-hs-125-94-engine-fire-extinguisher-bottle/important-cases","documents":"/api/acts/ad-hs-125-94-engine-fire-extinguisher-bottle/documents"}}