{"id":"F2006B02424","name":"AD/ANSON/6 - Oil Tank and Pipelines - Modification","slug":"ad-anson-6-oil-tank-and-pipelines-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41667,"registerId":"commonwealth-F2006B02424-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ANSON/6 - Oil Tank and Pipelines - 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)  Avro Anson and Avro 19 Series Aeroplanes\n\n \n\nAD/ANSON/6 Oil Tank and Pipelines - Modification 2/51\n\nApplicability: Anson.\n\n \n\nDocument: 1. A.V. Roe Anson Mod. No. 308; or\n\n \n\n2. RAAF Anson Order No. 49; or 3. ANO 105.1.31.4.5.6.\n\nCompliance: 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This appears to be the original scope as issued. The directive has a narrow, specific purpose (oil system modification for one aircraft type) that has not expanded beyond its original safety intent."},"complexity_factors":["Extremely short document (under 200 words)","Only 1 defined applicability term ('Anson')","Simple binary compliance structure: comply with one of three listed documents","No cross-references to other legislation beyond the three named technical documents","No conditional logic, exceptions, or nested provisions","Single operative requirement with immediate effect"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for **Avro Anson aircraft** — a British twin-engine plane used extensively in WWII and post-war Australia.\n\n**What it does:**\n- Requires owners/operators to modify the **oil tank and pipelines** on these aircraft\n- Mandates compliance with one of three technical documents:\n  - A.V. Roe Modification No. 308 (manufacturer's mod), OR\n  - RAAF Anson Order No. 49 (military directive), OR  \n  - ANO 105.1.31.4.5.6 (Air Navigation Order)\n\n**Who it affects:**\n- Anyone operating or maintaining Avro Anson aircraft in Australia\n\n**Why it matters:**\n- **Immediate compliance required** (\"Forthwith\") — no grace period\n- Addresses a safety-critical system (oil supply failure can cause engine seizure and crash)\n- The \"2/51\" suggests this directive was originally issued in **February 1951**, indicating this is historical aviation safety regulation still on the books\n\n**Key point:** This is a **legacy directive** — the Avro Anson was largely retired from Australian service by the 1960s, so this primarily affects **heritage aircraft, museums, and warbird operators** today."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text provides a single, narrowly focused requirement (modify oil tank and pipelines on Anson aircraft) and does not indicate any expansion or narrowing of scope from a prior instrument. There is no language in the directive that amends or rescinds previous applicability or changes the target population; it simply mandates compliance with specified modification documents forthwith."},"complexity_factors":["Short, narrowly focused directive affecting a single aircraft type (Applicability: Anson).","Compliance is immediate and mandatory (Compliance: Forthwith), reducing procedural complexity but increasing operational urgency.","Technical details are not included in the directive; compliance relies on external documents (three referenced modification orders), which requires users to obtain and interpret those documents.","Limited regulatory discretion in the text—operator must comply—so legal interpretation complexity is low but practical implementation complexity depends on technical documents and parts availability."],"plain_english_summary":"This directive from the Civil Aviation Safety Authority requires immediate modification of the oil tank and associated pipelines on Avro Anson aeroplanes, to be carried out forthwith following one of three referenced technical orders (A.V. Roe Anson Mod. No. 308; RAAF Anson Order No. 49; ANO 105.1.31.4.5.6). It affects Anson owners/operators and maintenance organisations, who must fund and perform the work promptly — creating downtime, parts and labour demand and little operational discretion."}},"importantCases":[],"_links":{"self":"/api/acts/ad-anson-6-oil-tank-and-pipelines-modification","history":"/api/acts/ad-anson-6-oil-tank-and-pipelines-modification/history","analysis":"/api/acts/ad-anson-6-oil-tank-and-pipelines-modification/analysis","conflicts":"/api/acts/ad-anson-6-oil-tank-and-pipelines-modification/conflicts","importantCases":"/api/acts/ad-anson-6-oil-tank-and-pipelines-modification/important-cases","documents":"/api/acts/ad-anson-6-oil-tank-and-pipelines-modification/documents"}}