{"id":"F2006B02410","name":"AD/ANSON/13 - Mainplane Trailing Edge Ribs, Top Skin and Aileron Hinges - Inspection","slug":"ad-anson-13-mainplane-trailing-edge-ribs-top-skin-and-aileron-hinges-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41653,"registerId":"commonwealth-F2006B02410-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ANSON/13 - Mainplane Trailing Edge Ribs, Top Skin and Aileron Hinges - 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/13 Mainplane Trailing Edge Ribs, Top Skin\n\nand Aileron Hinges - Inspection\n\nApplicability: Anson and Avro 19. Document:  Avro TSB No. 84.\n\nCompliance: At intervals not exceeding 150 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\n10/62\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-purpose airworthiness directive focused on specific structural inspections for two specific aircraft types. It has not expanded beyond its original safety purpose. The document appears to be a historical directive (dated 10/62 — October 1962) that remains in force under the 1998 regulations."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 3 defined elements: applicability, reference document, and compliance interval","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)","No conditional logic or exceptions","Single, unambiguous compliance requirement (inspect every 150 hours)","Straightforward applicability statement (specific aircraft types only)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998. It mandates safety inspections for specific vintage aircraft.\n\n**What it does:**\n- Requires owners/operators of **Avro Anson** and **Avro 19** series aeroplanes to inspect three specific parts of the aircraft's wing structure:\n  - **Mainplane trailing edge ribs** (the structural supports at the back edge of the main wing)\n  - **Top skin** (the upper surface covering of the wing)\n  - **Aileron hinges** (the pivot points that connect the ailerons — the movable wing sections that control roll — to the wing)\n\n**Who it affects:**\n- Owners and operators of Avro Anson and Avro 19 aircraft (these are British twin-engine aircraft from the 1930s-40s, historically used for military training and light transport)\n\n**How often:**\n- The inspection must be carried out **every 150 hours of flight time** (\"time in service\")\n\n**Why it matters:**\n- This directive addresses potential structural fatigue or failure in aging aircraft. The Avro Anson first flew in 1935, so any remaining airframes are extremely old. Regular inspection of wing structure and control surfaces is critical to prevent in-flight structural failure or loss of control.\n\n**Technical basis:**\n- The directive references **Avro TSB No. 84** — a Technical Service Bulletin from the original manufacturer (Avro) providing the specific inspection instructions."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text sets a specific inspection requirement for the named aircraft types and points to Avro TSB No. 84 for technical detail. The directive itself contains no indication that it narrows or expands the population or inspection frequency beyond what it states, and there is no text showing a change from an earlier scope within this document."},"complexity_factors":["Narrow applicability: applies only to Avro Anson and Avro 19 (straightforward target population). (\"Applicability: Anson and Avro 19.\")","Single prescriptive interval: fixed 150 hours time-in-service inspection interval reduces procedural complexity but creates recurring operational scheduling requirements. (\"Compliance: At intervals not exceeding 150 hours time in service.\")","Reliance on external technical bulletin: substantive inspection procedures and corrective actions are delegated to Avro TSB No. 84, requiring operators to obtain and follow that separate document. (\"Document: Avro TSB No. 84.\")","Lack of detailed measures in the AD text: AD does not specify inspection methods, acceptance criteria, or follow-up steps within the directive itself, which raises reliance on the TSB and potential interpretation questions.","Enforcement and alternative-compliance ambiguity: the AD sets the duty to inspect but does not state alternatives, exemptions, or administrative discretion in this text, which can create procedural questions for operators seeking different compliance means."],"plain_english_summary":"What this instrument does (mechanics)\n\n- This airworthiness directive requires regular inspections of specific wing components on certain vintage aircraft. It applies to Avro Anson and Avro 19 aeroplanes and directs operators to inspect the mainplane trailing edge ribs, the top skin, and the aileron hinges. (See: \"Applicability: Anson and Avro 19.\" and \"Compliance: At intervals not exceeding 150 hours time in service.\")\n- The inspections must be carried out at intervals not exceeding 150 hours time in service. The directive refers to Avro Technical Service Bulletin No. 84 for the technical details. (See: \"Document: Avro TSB No. 84.\")\n\nWho this affects\n\n- Aircraft owners and operators of Avro Anson and Avro 19 aeroplanes must make, or arrange for, the inspections. (Applicability and Compliance lines.)\n- Maintenance organisations and technicians who service those types will perform the inspections and any follow-up work required by findings in the inspections.\n\nWhy it matters (stated purpose and practical effect)\n\n- The directive sets a mandatory inspection rhythm intended to identify problems with trailing edge ribs, top skin, and aileron hinges before they degrade further. The AD points operators to Avro TSB No. 84 for the detailed inspection procedure and any corrective actions. (Document reference.)\n\nCosts, incentives and trade-offs (mechanical effects)\n\n- Who pays: The direct costs fall to the aircraft owner/operator: labour time for the inspections, any maintenance organisation fees, and parts and repair costs if defects are found. (Implied by the requirement for operator compliance.)\n- Business effect: Maintenance providers gain work from required inspections; operators incur recurring compliance costs and potential downtime while inspections/repairs are carried out. (Compliance interval imposes recurring work.)\n- Time and availability: Requiring inspections every 150 hours of service imposes periodic out-of-service time for affected aircraft, which is an opportunity cost against flying time or revenue generation. (See: \"Compliance: At intervals not exceeding 150 hours time in service.\")\n- Procedural dependence: The AD delegates technical detail to Avro TSB No. 84. That concentrates the procedural authority in the referenced TSB; operators must obtain and follow that document to meet the AD. (See: \"Document: Avro TSB No. 84.\")\n\nCompliance burden, discretion and implementation risk\n\n- Compliance burden: The AD is short on procedural detail within the text itself and relies on a separate technical bulletin, so operators need access to that bulletin and to suitably qualified maintenance personnel to satisfy the requirement. (Document referral.)\n- Discretion: The AD sets the inspection interval and affected items but does not set out exceptions or alternative means of compliance in its text. Any alternative procedures or exemptions would therefore need to be sought through the regulator or be documented in the referenced TSB. (Only the interval and the TSB reference are stated.)\n- Implementation risk: If the referenced TSB contains detailed non‑standard procedures or parts recommendations, operators who do not obtain or correctly apply the TSB could be non‑compliant. Missed inspections or incorrect inspection technique could allow defects to persist; conversely, conservative interpretation may lead to more frequent repairs or parts replacement.\n\nMarket and operational effects (concise)\n\n- The requirement raises operating costs for owners/operators of these types and creates recurring demand for maintenance services. It imposes a constraint on aircraft availability through periodic inspection cycles. The AD does not itself change ownership, operational authorisations, or broader market competition rules; it sets a maintenance obligation tied to continued airworthiness."}},"importantCases":[],"_links":{"self":"/api/acts/ad-anson-13-mainplane-trailing-edge-ribs-top-skin-and-aileron-hinges-inspection","history":"/api/acts/ad-anson-13-mainplane-trailing-edge-ribs-top-skin-and-aileron-hinges-inspection/history","analysis":"/api/acts/ad-anson-13-mainplane-trailing-edge-ribs-top-skin-and-aileron-hinges-inspection/analysis","conflicts":"/api/acts/ad-anson-13-mainplane-trailing-edge-ribs-top-skin-and-aileron-hinges-inspection/conflicts","importantCases":"/api/acts/ad-anson-13-mainplane-trailing-edge-ribs-top-skin-and-aileron-hinges-inspection/important-cases","documents":"/api/acts/ad-anson-13-mainplane-trailing-edge-ribs-top-skin-and-aileron-hinges-inspection/documents"}}