{"id":"F2006B02420","name":"AD/ANSON/22 - Mainplane Spar Boom Joints - Inspection","slug":"ad-anson-22-mainplane-spar-boom-joints-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41663,"registerId":"commonwealth-F2006B02420-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ANSON/22 - Mainplane Spar Boom Joints - 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/22 Mainplane Spar Boom Joints - Inspection 10/62\n\nApplicability: Anson and Avro 19. Document:  Avro TSB No. 88.\n\nCompliance: Inspection - Before issue of C of A and at intervals not exceeding 5 years. Bolt replacement - Before issue of C of A.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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, single-purpose airworthiness directive from 1962 (as indicated by the '10/62' reference). It has not expanded beyond its original narrow purpose of ensuring structural integrity of specific vintage aircraft spar joints. Airworthiness directives are inherently limited in scope by design — they address specific safety defects in specific aircraft types."},"complexity_factors":["Extremely short document — only 4 substantive lines of regulatory text","No defined terms section — uses common aviation terminology only","No cross-references to other legislation or regulations beyond the parenthetical mention of Civil Aviation Regulations 1998, Part 39","Simple binary compliance structure: inspect every 5 years, replace bolts once","Single applicability criterion (aircraft type) with no exceptions or conditional logic","No penalty provisions, appeal mechanisms, or procedural subsections"],"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/operators of **Avro Anson and Avro 19 series aeroplanes** to inspect the **mainplane spar boom joints** (critical structural connections in the wings) at specific intervals.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains **Avro Anson or Avro 19 aircraft** — these are vintage British twin-engine aircraft from the 1930s-40s, some still flying in Australia.\n\n**What must be done:**\n- **Inspection:** Check the spar boom joints **before the aircraft gets its Certificate of Airworthiness (C of A)** — the official document saying it's safe to fly — and then **every 5 years** after that.\n- **Bolt replacement:** Replace certain bolts **before the C of A is issued** (one-time requirement).\n\n**Why it matters:**\nSpar boom joints are crucial structural components. If they fail, the wing could collapse. This AD prevents catastrophic structural failure by ensuring these old aircraft (now 80+ years old) are inspected regularly for metal fatigue, corrosion, or wear.\n\n**Source document:** The directive references **Avro TSB No. 88** — a technical service bulletin from the original manufacturer providing the detailed inspection instructions."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive’s scope is narrowly defined in the text and applies only to Avro Anson and Avro 19 aircraft and to their mainplane spar boom joints. The specified actions (inspection before C of A, five-year re-inspections, and bolt replacement before C of A) are explicit in the instrument and do not indicate an expansion or contraction from the stated applicability or required measures."},"complexity_factors":["Narrow applicability limited to two aircraft types (Anson and Avro 19). (Applicability: Anson and Avro 19.)","Few mandatory actions specified (inspection and bolt replacement) with clear timing requirements. (Compliance: Before issue of C of A; at intervals not exceeding 5 years.)","Reference to an external technical document (Avro TSB No. 88) for procedural detail, which requires technical interpretation by maintenance personnel. (Document: Avro TSB No. 88.)","Enforcement tied to C of A issuance, creating a binary compliance check linked to certification rather than a complex continuing oversight regime. (Compliance: Before issue of C of A.)"],"plain_english_summary":"What this directive does, in simple terms:\n\n- This airworthiness directive (AD/ANSON/22) requires specific checks and a part replacement on Avro Anson and Avro 19 aeroplanes. (Applicability: Anson and Avro 19; Document: Avro TSB No. 88.)\n\n- Before the aircraft can be issued a Certificate of Airworthiness (C of A), the mainplane spar boom joints must be inspected, and certain bolts must be replaced. (Compliance: Inspection - Before issue of C of A; Bolt replacement - Before issue of C of A.)\n\n- After the first inspection required for C of A, the directive requires repeat inspections at intervals that do not exceed five years. (Compliance: at intervals not exceeding 5 years.)\n\nWho is affected:\n\n- Owners and operators of Avro Anson and Avro 19 aircraft are directly affected because they must carry out the inspections and the bolt replacement to obtain or maintain a C of A. (Applicability: Anson and Avro 19.)\n\nWho decides and what enforces it:\n\n- The directive is issued under the Commonwealth framework for civil aviation safety (Civil Aviation Regulations), and the Civil Aviation Safety Authority enforces compliance through the C of A process. (Header: Commonwealth of Australia (Civil Aviation Regulations 1998), PART 39 - 105 Civil Aviation Safety Authority.)\n\nMechanics of compliance (who pays, what they must do, and timing):\n\n- Operators/owners pay for the inspection work and for the bolt replacement. The inspection must be completed before the aircraft is issued (or reissued) its C of A; bolts specified by the directive must be replaced before issue of the C of A. (Compliance: Before issue of C of A.)\n\n- After the initial compliance for the C of A, inspections must be repeated no less frequently than every five years. (Compliance: at intervals not exceeding 5 years.)\n\nWhy the directive exists (source claim and practical implications):\n\n- The AD cites Avro Technical Service Bulletin No. 88 as the technical source for the required actions (Document: Avro TSB No. 88). The directive’s stated purpose (by implication from its title and the referenced TSB) is to ensure the airworthiness of the mainplane spar boom joints through inspection and bolt replacement.\n\n- Practical implications include direct maintenance costs, aircraft downtime while work is performed (which can delay issuance of a C of A), and the need to follow the technical procedures outlined in the referenced Avro TSB when carrying out inspections and replacements. Operators must budget for these activities and schedule them to avoid C of A delays. (Compliance: Inspection - Before issue of C of A and at intervals not exceeding 5 years; Bolt replacement - Before issue of C of A.)\n\nCompliance risks, trade-offs and implementation notes:\n\n- Compliance burden: The directive imposes discrete maintenance tasks (inspection and bolt replacement) and a recurring inspection cycle (every five years). The owner/operator bears the cost and must arrange qualified maintenance personnel and any parts required.\n\n- Timing and operational impact: Because the inspection and bolt replacement are tied to the C of A issuance, failure to complete them on schedule can delay or prevent the aircraft being certified for service.\n\n- Reliance on external technical material: The AD references Avro TSB No. 88 for details; compliance therefore requires access to and implementation of that bulletin’s procedures.\n\n- Concentration of effect: The AD applies to a small, specific set of aircraft types (Anson and Avro 19). That concentrates costs on owners/operators of these aircraft rather than imposing a broad industry-wide requirement. (Applicability: Anson and Avro 19.)\n\nSummary statement of behaviour change:\n\n- Owners/operators will inspect the mainplane spar boom joints at least once before a C of A is issued and then at five-year intervals, and will replace designated bolts before C of A issuance. This changes maintenance scheduling and spending for the affected aircraft and links those tasks directly to certificate issuance. (Compliance details cited above.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-anson-22-mainplane-spar-boom-joints-inspection","history":"/api/acts/ad-anson-22-mainplane-spar-boom-joints-inspection/history","analysis":"/api/acts/ad-anson-22-mainplane-spar-boom-joints-inspection/analysis","conflicts":"/api/acts/ad-anson-22-mainplane-spar-boom-joints-inspection/conflicts","importantCases":"/api/acts/ad-anson-22-mainplane-spar-boom-joints-inspection/important-cases","documents":"/api/acts/ad-anson-22-mainplane-spar-boom-joints-inspection/documents"}}