{"id":"F2006B03742","name":"AD/BEECH 23/29 Amdt 2 - Wing Main Spar Corrosion","slug":"ad-beech-23-29-amdt-2-wing-main-spar-corrosion","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43335,"registerId":"commonwealth-F2006B03742-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 23/29 Amdt 2 - Wing Main Spar Corrosion","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)  Beechcraft 19, 23 and 24 Series Aeroplanes\n\n \n\nAD/BEECH 23/29\n\nAmdt 2\n\n\nWing Main Spar Corrosion 12/86\n\n \n\nApplicability: All 19, 23 and 24 series.\n\n \n\nRequirement: Action in accordance with Beechcraft SI No. 0824-035 Rev. II.\n\n \n\nCompliance: Prior to the issue of the next Maintenance Release after 31 December 1986 and thereafter at intervals not exceeding 12 months.\n\n \n\nBackground: A history of Major Defect Reports has warranted an increase in the periodicity of this Directive to that originally called up by Beech.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, targeted safety directive focused on a specific corrosion risk in specific aircraft models. Amendment 2 appears to have tightened the inspection interval (increasing periodicity) based on operational experience, but this remains within the original safety purpose — it has not expanded into unrelated regulatory areas."},"complexity_factors":["Extremely short document — only 8 substantive lines","No defined terms section; all language is plain operational English","Single cross-reference to external manufacturer document (Beechcraft SI No. 0824-035 Rev. II)","No nested conditions, exceptions, or conditional logic","Linear structure: applicability → requirement → compliance → background","Amendment 2 indicates version history but does not add procedural complexity"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it like a compulsory recall notice, but for aircraft rather than cars.\n\n**What it does:** It requires owners and operators of specific Beechcraft aeroplanes (the 19, 23 and 24 series) to inspect the **wing main spar** — the critical structural beam that runs through the wing and essentially holds it together — for **corrosion** (rust and deterioration).\n\n**Who must follow it:** Anyone who owns or operates these particular Beechcraft models in Australia.\n\n**What they must do:**\n- Follow the inspection procedures set out in **Beechcraft Service Instruction No. 0824-035 Revision II** (the manufacturer's official maintenance bulletin)\n- Complete the first inspection **before the next Maintenance Release is issued after 31 December 1986**\n- Repeat the inspection **at least every 12 months** thereafter\n\n**Why it matters:** Corrosion in the main wing spar can weaken the aircraft's structure, potentially leading to wing failure. CASA issued this directive after receiving multiple **Major Defect Reports** — serious safety notifications from the aviation industry — indicating that corrosion was showing up more frequently than originally expected. The directive makes the inspections more frequent than Beechcraft initially recommended, tightening safety standards based on real-world experience."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment (Amdt 2) alters the Directive’s periodicity and compliance timing. It requires inspection actions per Beechcraft Service Instruction No. 0824-035 Rev. II and sets the compliance trigger as prior to the next Maintenance Release after 31 December 1986 and thereafter at intervals not exceeding 12 months (Requirement; Compliance). The Background states that a history of Major Defect Reports warranted this change in periodicity (Background), so the amendment changes the required inspection frequency and embeds an annual maximum interval into the Directive (Compliance)."},"complexity_factors":["Short, narrowly targeted directive text but delegates technical detail to an external manufacturer Service Instruction (Requirement).","Date-based compliance trigger tied to the next Maintenance Release after 31 December 1986 (Compliance).","Recurring inspection interval (every 12 months) creates ongoing compliance obligations (Compliance).","Applies to all aircraft in three model series (Applicability) — broad applicability but narrow technical scope.","Implementation relies on correct interpretation and availability of the referenced Service Instruction (Requirement)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Beechcraft 19, 23 and 24 series aeroplanes to carry out the inspections and any associated actions set out in Beechcraft Service Instruction No. 0824‑035 Rev. II. Inspections must be done before the next Maintenance Release after 31 December 1986 and repeated at intervals not exceeding 12 months, with operators bearing the recurring costs and downtime."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-23-29-amdt-2-wing-main-spar-corrosion","history":"/api/acts/ad-beech-23-29-amdt-2-wing-main-spar-corrosion/history","analysis":"/api/acts/ad-beech-23-29-amdt-2-wing-main-spar-corrosion/analysis","conflicts":"/api/acts/ad-beech-23-29-amdt-2-wing-main-spar-corrosion/conflicts","importantCases":"/api/acts/ad-beech-23-29-amdt-2-wing-main-spar-corrosion/important-cases","documents":"/api/acts/ad-beech-23-29-amdt-2-wing-main-spar-corrosion/documents"}}