{"id":"F2006B02421","name":"AD/ANSON/23 - Main Undercarriage Radius Rod Tube at Rear Spar Attachment - Inspection","slug":"ad-anson-23-main-undercarriage-radius-rod-tube-at-rear-spar-attachment-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41664,"registerId":"commonwealth-F2006B02421-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ANSON/23 - Main Undercarriage Radius Rod Tube at Rear Spar Attachment - 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/23 Main Undercarriage Radius Rod Tube at\n\nRear Spar Attachment - Inspection\n\nApplicability: Anson and Avro 19. Document:  Avro TSB No. 89.\n\nCompliance: At intervals not exceeding 250 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\n\n7/63\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1963 (indicated by '7/63' at bottom). It has not expanded beyond its original narrow purpose of inspecting one specific component on two specific aircraft types. Airworthiness directives are typically narrow, technical instruments and this follows that pattern."},"complexity_factors":["Extremely short document — only 8 substantive lines","No defined terms section — uses plain aviation terminology","No cross-references to other legislation beyond the enabling regulation (CAR 1998 Part 39)","Single, unambiguous compliance requirement (250-hour interval)","No conditional logic, exceptions, or alternative compliance methods","References only one external technical document (Avro TSB No. 89)"],"plain_english_summary":"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:**\nIt requires owners and operators of **Avro Anson and Avro 19 series aircraft** to inspect a specific part — the **main undercarriage radius rod tube where it attaches to the rear spar** — at regular intervals.\n\n**Who it affects:**\nAnyone who owns, operates, or maintains these specific vintage British aircraft in Australia.\n\n**What must be done:**\n- **Inspection required:** Check the main undercarriage radius rod tube at its rear spar attachment point\n- **How often:** Every 250 hours of \"time in service\" (meaning actual flying hours, not calendar time)\n- **Technical reference:** Follow the procedures in **Avro Technical Service Bulletin (TSB) No. 89**\n\n**Why it matters:**\nAirworthiness Directives are legally enforceable safety instructions. If you don't comply, your aircraft is not considered airworthy and cannot legally fly. This particular AD addresses potential structural issues with the undercarriage attachment — a critical safety component that could fail during landing if not properly maintained. The Avro Anson is a World War II-era aircraft, so these aging airframes require ongoing surveillance for metal fatigue and structural integrity."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied directive explicitly applies to Avro Anson and Avro 19 aeroplanes and mandates inspections at intervals not exceeding 250 hours time in service. The text contains no information indicating a change in scope from any earlier or original instrument; no prior scope or changes are provided in the supplied material, so a change cannot be determined from this document alone."},"complexity_factors":["Narrow applicability: applies only to Avro Anson and Avro 19 series (Applicability line).","Simple mandatory frequency specified: single fixed inspection interval — 250 hours time in service (Compliance line).","Dependence on external technical document (Avro TSB No. 89) for procedural detail — the AD text lacks inspection steps and acceptance criteria (Document citation).","Operational scheduling and record-keeping burden from recurring inspections (implicit from Compliance requirement).","Potential variation in execution because the AD text does not specify inspection technique or remediation, creating implementation discretion for maintenance providers.","Regulatory basis under Part 39 (header) introduces legal obligation and enforcement mechanisms despite brevity of the AD."],"plain_english_summary":"This AD requires operators of Avro Anson and Avro 19 aircraft to inspect the main undercarriage radius rod tube at its rear-spar attachment at intervals not exceeding 250 hours time‑in‑service. It affects owners, operators and maintenance organisations, who must follow the schedule and consult Avro TSB No. 89 for inspection details; owners bear inspection and any repair costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-anson-23-main-undercarriage-radius-rod-tube-at-rear-spar-attachment-inspection","history":"/api/acts/ad-anson-23-main-undercarriage-radius-rod-tube-at-rear-spar-attachment-inspection/history","analysis":"/api/acts/ad-anson-23-main-undercarriage-radius-rod-tube-at-rear-spar-attachment-inspection/analysis","conflicts":"/api/acts/ad-anson-23-main-undercarriage-radius-rod-tube-at-rear-spar-attachment-inspection/conflicts","importantCases":"/api/acts/ad-anson-23-main-undercarriage-radius-rod-tube-at-rear-spar-attachment-inspection/important-cases","documents":"/api/acts/ad-anson-23-main-undercarriage-radius-rod-tube-at-rear-spar-attachment-inspection/documents"}}