{"id":"F2006B02414","name":"AD/ANSON/17 Amdt 1 - Engine Mounting Sub-Frame - Inspection","slug":"ad-anson-17-amdt-1-engine-mounting-sub-frame-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41657,"registerId":"commonwealth-F2006B02414-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ANSON/17 Amdt 1 - Engine Mounting Sub-Frame - Inspection","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/17\n\nAmdt 1\n\n\nEngine Mounting Sub-Frame - Inspection 11/67\n\n \n\nApplicability: Anson and Avro 19. Document:  Avro TSB No. 80.\n\nCompliance: At intervals not exceeding 100 hours time in service.\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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical maintenance requirement for a specific vintage aircraft type. As Amendment 1, it likely clarifies or slightly modifies the original AD/ANSON/17, but remains tightly scoped to engine sub-frame inspections on Avro Anson/19 aircraft. No scope creep evident."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","No defined terms section — relies on standard aviation terminology","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Simple unconditional obligation: inspect every 100 hours","Single applicability criterion (aircraft type) with no exceptions or nested conditions","Refers to external technical document (Avro TSB No. 80) for actual inspection procedures, keeping the AD itself minimal"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\n- Requires owners and operators of **Avro Anson and Avro 19 series aeroplanes** to inspect the **engine mounting sub-frame** (the structural component that attaches the engine to the aircraft body).\n- The inspection must be carried out **every 100 hours of flight time** (\"time in service\").\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains these specific vintage British aircraft in Australia. The Avro Anson is a 1930s-40s twin-engine aircraft originally used for maritime patrol and training.\n\n**Why it matters:**\n- Engine mounting sub-frames can develop cracks or fatigue over time. If they fail in flight, the engine could detach — obviously catastrophic. This directive ensures regular checks to catch problems before they become dangerous.\n\n**Key details:**\n- **Document reference:** Avro TSB No. 80 (the manufacturer's technical service bulletin)\n- **Compliance:** Every 100 hours time in service (not calendar time — actual flying hours)\n- **This is Amendment 1:** An updated version of an earlier directive (AD/ANSON/17), suggesting the requirements or applicability may have been revised from the original."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text sets a single, recurring inspection requirement for Avro Anson and Avro 19 aeroplanes and cites Avro TSB No. 80 for technical guidance (Applicability; Document; Compliance). The instrument is labelled an amendment (Amdt 1) but the text provided does not indicate any expansion or reduction of applicability or compliance intervals compared with a prior version. On the basis of the supplied document alone, there is no evidence in-text that the scope has changed from an original intent."},"complexity_factors":["Narrow applicability limited to Avro Anson and Avro 19 (Applicability clause).","Single, straightforward compliance requirement (inspect engine mounting sub-frame at <=100 hours TIS) (Compliance clause).","Reliance on an external technical document (Avro TSB No. 80) for inspection procedure increases procedural dependency (Document clause).","No procedural detail, remedial actions, recordkeeping, or enforcement steps included in the text — requires cross-reference to other regulatory materials.","Amendment label present (Amdt 1) but no in-text comparison to prior version; lack of context could complicate historical compliance tracking."],"plain_english_summary":"This AD requires owners/operators of Avro Anson and Avro 19 aeroplanes to inspect the engine mounting sub‑frame at intervals not exceeding 100 hours time in service, using the procedures referenced in Avro TSB No. 80.  \n\nIt creates a recurring compliance obligation and associated downtime and costs for operators (or their maintenance providers), who must obtain the TSB and carry out any repairs the inspection identifies."}},"importantCases":[],"_links":{"self":"/api/acts/ad-anson-17-amdt-1-engine-mounting-sub-frame-inspection","history":"/api/acts/ad-anson-17-amdt-1-engine-mounting-sub-frame-inspection/history","analysis":"/api/acts/ad-anson-17-amdt-1-engine-mounting-sub-frame-inspection/analysis","conflicts":"/api/acts/ad-anson-17-amdt-1-engine-mounting-sub-frame-inspection/conflicts","importantCases":"/api/acts/ad-anson-17-amdt-1-engine-mounting-sub-frame-inspection/important-cases","documents":"/api/acts/ad-anson-17-amdt-1-engine-mounting-sub-frame-inspection/documents"}}