{"id":"F2006B02418","name":"AD/ANSON/20 Amdt 1 - Undercarriage Operating Tube - Inspection","slug":"ad-anson-20-amdt-1-undercarriage-operating-tube-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41661,"registerId":"commonwealth-F2006B02418-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ANSON/20 Amdt 1 - Undercarriage Operating Tube - 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/20\n\nAmdt 1\n\n\nUndercarriage Operating Tube - Inspection 11/67\n\n \n\nApplicability: Anson and Avro 19.\n\n \n\nDocument: Avro TSB No. 80 paragraph 3.6.\n\n \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 discrete, targeted safety directive focused on a specific mechanical component of specific vintage aircraft. It has not expanded beyond its original purpose of ensuring undercarriage operating tube integrity. The amendment (Amdt 1) appears to be a routine update rather than a scope expansion."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined applicability terms (aircraft models)","Single compliance requirement with clear time interval","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No conditional logic, exceptions, or nested provisions","References only one external technical document (Avro TSB No. 80)","Straightforward imperative language ('Compliance: At intervals not exceeding...')"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety instruction issued by Australia's Civil Aviation Safety Authority (CASA) that requires owners or operators of specific aircraft to perform a specific maintenance task.\n\n**What it does:** It orders operators of **Avro Anson and Avro 19 series aeroplanes** to inspect the **undercarriage operating tube** (a hydraulic or pneumatic pipe that helps operate the landing gear) at regular intervals.\n\n**Who it affects:** Anyone who owns, operates, or maintains these specific vintage British aircraft in Australia.\n\n**What must be done:**\n- **Inspection required:** Check the undercarriage operating tube\n- **How often:** Every 100 hours of \"time in service\" (meaning actual flying hours, not just calendar time)\n- **Technical standard:** Follow the procedure in **Avro Technical Service Bulletin (TSB) No. 80, paragraph 3.6** (the manufacturer's official maintenance instruction)\n\n**Why it matters:** This directive prevents landing gear failures. If the operating tube cracks, leaks, or fails, the landing gear might not extend or retract properly — potentially causing a crash on landing or takeoff. The 100-hour interval ensures problems are caught before they become dangerous.\n\n**Key detail:** This is \"Amendment 1\" (Amdt 1), meaning it updates a previous version of this directive, likely to clarify requirements or adjust the inspection interval based on operational experience."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text of the instrument sets a targeted inspection requirement for the undercarriage operating tube on Avro Anson and Avro 19 aeroplanes, references Avro TSB No. 80 paragraph 3.6, and mandates a maximum 100‑hour inspection interval. There is no information in the provided text indicating a change from an earlier or original scope; the AD simply prescribes a mandatory inspection frequency and points to the TSB for method. (Applicability; Document; Compliance)"},"complexity_factors":["Narrow, specific applicability limited to Avro Anson and Avro 19 (low breadth of subjects). (Applicability)","Clear, single compliance interval (100 hours) reduces interpretive complexity. (Compliance)","Dependence on an external technical document (Avro TSB No. 80 paragraph 3.6) for procedural detail increases operational dependency and creates an external-source complexity. (Document)","Lack of procedural, recordkeeping, and remedial detail within the AD itself requires operators to consult additional material or general regulatory practice. (Document; Compliance)","Enforcement and inspection authority are not spelled out in the AD text, relying on broader regulatory framework for those matters (creates modest administrative uncertainty). (Compliance)"],"plain_english_summary":"This Airworthiness Directive (issued by CASA) makes the Avro TSB No. 80 para. 3.6 inspection of the undercarriage operating tube mandatory for Avro Anson and Avro 19 aircraft at intervals not exceeding 100 hours time in service. Owners/operators must arrange and pay for the recurring inspections and any repairs; the AD relies on the TSB for procedural and corrective detail."}},"importantCases":[],"_links":{"self":"/api/acts/ad-anson-20-amdt-1-undercarriage-operating-tube-inspection","history":"/api/acts/ad-anson-20-amdt-1-undercarriage-operating-tube-inspection/history","analysis":"/api/acts/ad-anson-20-amdt-1-undercarriage-operating-tube-inspection/analysis","conflicts":"/api/acts/ad-anson-20-amdt-1-undercarriage-operating-tube-inspection/conflicts","importantCases":"/api/acts/ad-anson-20-amdt-1-undercarriage-operating-tube-inspection/important-cases","documents":"/api/acts/ad-anson-20-amdt-1-undercarriage-operating-tube-inspection/documents"}}