{"id":"F2006B02768","name":"AD/B727/65 - Engine Fire Extinguisher - Inspection and Modification","slug":"ad-b727-65-engine-fire-extinguisher-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42110,"registerId":"commonwealth-F2006B02768-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/65 - Engine Fire Extinguisher - Inspection and Modification","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)  Boeing 727 Series Aeroplanes\n\n \n\nAD/B727/65 Engine Fire Extinguisher - Inspection\n\nand Modification\n\n\n9/69\n\n \n\nApplicability:  All models. Document: APCO SB No. 26-04. Compliance:  Forthwith.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The text of the AD is a single, self-contained directive applying to all Boeing 727 models and directing compliance with APCO SB No. 26-04 forthwith. The source text contains no information indicating a change in scope from an earlier instrument or differing original intent. Based on the AD as published, the scope is clear and unchanged within the provided source."},"complexity_factors":["Short, directive text with few technical details: the AD points to an external service bulletin (APCO SB No. 26-04) for the substantive technical steps, which requires consulting another document.","Immediate compliance requirement (\"forthwith\") concentrates scheduling and logistics issues, increasing practical complexity for operators.","Broad scope (applies to all Boeing 727 models) creates heterogeneous operational impacts depending on individual operator fleets and maintenance capacity.","Regulatory clarity about obligation is high (mandatory AD), but implementation details and resource implications depend on the external service bulletin and available maintenance resources.","Enforcement and decision authority are clear (CASA under Part 39), reducing legal-interpretation complexity but leaving operational complexity to practitioners."],"plain_english_summary":"This Airworthiness Directive (AD/B727/65) requires all Boeing 727 operators to inspect and modify engine fire extinguisher systems immediately, following APCO Service Bulletin No. 26-04. Issued and enforceable by CASA under Part 39, the AD binds owners/operators to carry out the work forthwith, creating near-term downtime and direct maintenance costs while restoring required airworthiness."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive. It addresses a specific technical issue (engine fire extinguishers) on a specific aircraft type (Boeing 727). There is no indication of scope creep; it remains focused on its original safety purpose."},"complexity_factors":["Extremely short — only a few lines of operative text","No defined terms section; relies entirely on external reference (APCO SB No. 26-04)","No conditional logic or exceptions — applies to 'All models' with immediate compliance","Single cross-reference to one technical document","No nested provisions or subsections"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of **Boeing 727 series aircraft** to inspect and modify the **engine fire extinguisher systems** on their planes.\n\n**Who must comply:** Anyone operating any model of Boeing 727 aircraft in Australia.\n\n**How to comply:** Follow the instructions in **APCO Service Bulletin No. 26-04** (the technical document referenced). The directive says \"Forthwith\" — meaning **immediately**, without delay.\n\n**Why it matters:** Engine fire extinguisher systems are critical safety equipment. If they fail, a fire in an engine could become uncontrollable, endangering everyone on board. This directive likely addresses a known defect or failure mode discovered in these systems, requiring urgent action to keep aircraft safe."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-65-engine-fire-extinguisher-inspection-and-modification","history":"/api/acts/ad-b727-65-engine-fire-extinguisher-inspection-and-modification/history","analysis":"/api/acts/ad-b727-65-engine-fire-extinguisher-inspection-and-modification/analysis","conflicts":"/api/acts/ad-b727-65-engine-fire-extinguisher-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-b727-65-engine-fire-extinguisher-inspection-and-modification/important-cases","documents":"/api/acts/ad-b727-65-engine-fire-extinguisher-inspection-and-modification/documents"}}