{"id":"F2006B11251","name":"AD/M20/46 Amdt 1 - Radiant Heat Shield, V-Band Clamp and Hydraulic Poly Line","slug":"ad-m20-46-amdt-1-radiant-heat-shield-v-band-clamp-and-hydraulic-poly-line","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56971,"registerId":"commonwealth-F2006B11251-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nOn the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/M20/46 and issues the following AD under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)\n\nMooney M20 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/M20/46","sectionType":"part","heading":"AD/M20/46","content":"# AD/M20/46\n\nAmdt 1\n\n  \n\nRadiant Heat Shield, V-Band Clamp and Hydraulic Poly Line\n\n  \n2/2005","sortOrder":1},{"sectionNumber":"DM","sectionType":"part","heading":"DM","content":"# AD/M20/46\n\nAmdt 1\n\n  \n\nRadiant Heat Shield, V-Band Clamp and Hydraulic Poly Line\n\n  \n2/2005\n\n# DM","sortOrder":2}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"The instrument explicitly revokes the previous AD (AD/M20/46) and issues a replacement AD (AD/M20/46 Amdt 1) under CASR 1998 subreg 39.1(1). The supplied text indicates an amendment or reissue has occurred and that the replacement AD addresses the radiant heat shield, V-band clamp and hydraulic poly line for Mooney M20 aeroplanes. The supplied excerpt does not include the prior AD’s full text or the new requirement/compliance specifics, so the precise substantive differences in scope or compliance obligations between the original AD and this amended AD cannot be determined from the material provided."},"complexity_factors":["Legal delegation: AD is issued under CASR 1998 subregulation 39.1(1), concentrating decision-making in the CASA delegate (creates administrative discretion to specify remedial actions).","Multiple technical components: addresses three distinct aircraft items (radiant heat shield, V-band clamp, hydraulic poly line) each of which may require different technical remedies and schedules.","Cross-referencing structure: compliance obligations are split across requirement, applicability and compliance sections that must be read together to know exact duties.","Operational impacts: potential immediate grounding or phased interventions with scheduling and parts/labour implications for operators.","Information gap in supplied text: the supplied excerpt revokes the prior AD and references the requirement/compliance details but does not include the specific technical instructions or timelines, forcing readers to obtain the full AD to act.","Enforcement and evidentiary needs: operators must document compliance in line with the AD; demonstrating conformity may require certified work and record-keeping.","Market interaction: creates demand for certified maintenance/parts and may affect small MROs and owners differently depending on access to parts, skills and funding."],"plain_english_summary":"This instrument revokes AD M20/46 and issues a replacement under CASR 1998 subreg 39.1(1), targeting Mooney M20 aeroplanes to address the radiant heat shield, a V‑band clamp and a hydraulic poly line. The CASA delegate prescribes the specific corrective actions; aircraft owners/operators must carry out inspections, repairs or replacements per the AD’s requirement and compliance sections. Costs, downtime and maintenance demand fall to operators; obtain the full AD text for exact measures and timelines."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This appears to be a standard amendment to an existing Airworthiness Directive. The scope remains focused on the original safety issue affecting Mooney M20 aircraft. Amendment 1 suggests refinement of requirements rather than expansion into new aircraft types or unrelated safety matters."},"complexity_factors":["Multiple amendment layers (this is Amendment 1, revoking a previous version)","Three distinct technical components addressed in one instrument (heat shield, clamp, hydraulic line)","Cross-references to subregulation 39.1(1) of CASR 1998 (Civil Aviation Safety Regulations)","Conditional compliance structure with multiple sections (applicability, requirement, compliance, background)","Technical aviation terminology requiring specialist knowledge to interpret fully"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) for aircraft. Think of it like a compulsory recall notice for your car, but for aeroplanes.\n\n**What it does:**\nThis directive replaces an earlier safety order (AD/M20/46) and mandates specific repairs or inspections for **Mooney M20 series aeroplanes** — a popular single-engine aircraft used by private pilots and flying schools.\n\n**The safety problem:**\nThe directive addresses three specific issues:\n- **Radiant heat shield** — a protective barrier that prevents engine heat from damaging nearby components\n- **V-band clamp** — a type of metal fastening ring used on exhaust systems\n- **Hydraulic poly line** — plastic tubing that carries hydraulic fluid\n\nThese components can fail or degrade, creating unsafe flying conditions.\n\n**Who must act:**\nOwners and operators of Mooney M20 series aircraft must comply with the inspection, repair or replacement requirements set out in the directive.\n\n**Why it matters:**\nAirworthiness Directives are legally binding. You cannot fly the aircraft until you comply (or get specific permission to defer). Non-compliance means the aircraft is not considered airworthy — it's grounded. This particular AD prevents potential in-flight failures that could lead to loss of control or forced landings."}},"importantCases":[],"_links":{"self":"/api/acts/ad-m20-46-amdt-1-radiant-heat-shield-v-band-clamp-and-hydraulic-poly-line","history":"/api/acts/ad-m20-46-amdt-1-radiant-heat-shield-v-band-clamp-and-hydraulic-poly-line/history","analysis":"/api/acts/ad-m20-46-amdt-1-radiant-heat-shield-v-band-clamp-and-hydraulic-poly-line/analysis","conflicts":"/api/acts/ad-m20-46-amdt-1-radiant-heat-shield-v-band-clamp-and-hydraulic-poly-line/conflicts","importantCases":"/api/acts/ad-m20-46-amdt-1-radiant-heat-shield-v-band-clamp-and-hydraulic-poly-line/important-cases","documents":"/api/acts/ad-m20-46-amdt-1-radiant-heat-shield-v-band-clamp-and-hydraulic-poly-line/documents"}}