{"id":"F2006B07820","name":"Airworthiness Directives 2004 - Revocation and Remaking - Compressed Gas Cylinders","slug":"airworthiness-directives-2004-revocation-and-remaking-compressed-gas-cylinders","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50708,"registerId":"commonwealth-F2006B07820-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Airworthiness Directives 2004 - Revocation and Remaking - Compressed Gas Cylinders","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 20.2\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\n Airworthiness Directives 2004\n\n I, DAVID ALAN VILLIERS, delegate of the Civil Aviation Safety\n\n Authority, acting under subregulation 39.001 (1) of the Civil\n\n Aviation Safety Regulations 1998:\n\n (a) revoke the Airworthiness Directives mentioned in\n\n Schedule 1; and\n\n (b) make, as separate instruments, each Airworthiness\n\n Directive mentioned in Schedule 1 and attached.\n\n \n\n ![](image.001.png)\n\n David Villiers\n\n Delegate of the Civil Aviation Safety Authority\n\n \n\n  20 December 2004\n\n Note:   Each attached Airworthiness Directive is being re-made in exactly the\n\n same form as appears in the latest published edition of the Directive.\n\n \n\n\n Schedule 1 Revocation and Remaking of\n\n Airworthiness Directives\n\n Compressed Gas Cylinders\n\n AD Name AD Number\n\n Inspection, Test and Retirement AD/GAS/1 Amdt 7\n\n Filament Wound, Fibre-Glass, High Pressure Spherical Vessels AD/GAS/2\n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This instrument does not change the substantive scope or obligations of the listed Airworthiness Directives. It revokes the existing directives and reissues each one as a separate instrument in the same form as the latest published edition (see opening paragraph clauses (a)–(b) and the Note). The practical effect is administrative (new instrument citations); the operative technical requirements under the ADs remain unchanged."},"complexity_factors":["Instrument is procedural: revocation and re‑making with identical text reduces substantive complexity","Short text with clear legal authority cited (subregulation 39.001(1))","Dependence on attachments/latest published editions — scope requires checking the attached ADs for operational details","Affects technical compliance areas (airworthiness, inspections, retirements) that are themselves technical, though unchanged by this instrument","Administrative follow‑up required by regulated parties to update references and records"],"plain_english_summary":"What this instrument does (mechanically)\n\n- The delegate of the Civil Aviation Safety Authority (CASA) uses the power in subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998 to revoke a short list of existing Airworthiness Directives (ADs) and to re‑make each one as a separate legal instrument (see opening paragraph: \"acting under subregulation 39.001 (1)\" and clauses (a)–(b)).\n- The ADs listed in Schedule 1 are: AD/GAS/1 Amdt 7 (Inspection, Test and Retirement) and AD/GAS/2 (Filament Wound, Fibre-Glass, High Pressure Spherical Vessels) (see Schedule 1). The instrument states that each re‑made AD is identical in form to the latest published edition of that Directive (see Note: \"Each attached Airworthiness Directive is being re-made in exactly the same form...\").\n\nWho this affects\n\n- Aircraft owners/operators, maintenance organisations, certificated engineers and other parties subject to the two listed ADs concerning compressed gas cylinders and related vessels. Those parties remain legally obliged to comply with the substantive requirements of the ADs (inspections, tests, retirements, etc.). (See Schedule 1 for the AD names and the Note about identical form.)\n\nWhy it matters (purpose claims and their practical implications)\n\n- The stated procedural purpose is to revoke the existing ADs and reissue them as separate instruments in the same form as the latest published versions (opening paragraph and Note). The immediate practical implication is administrative: the legal form and citation of the directives will be the newly issued instruments, while the substantive requirements remain the same.\n\nCosts, incentives and trade-offs (mechanical and incentive effects)\n\n- Who pays: Regulated parties (aircraft operators, maintenance providers and owners of the equipment covered by the ADs) continue to bear the direct costs of complying with the substantive AD requirements (inspection, testing, retirement) because the re‑made ADs are identical in content (see Schedule 1 and Note). Any one‑off administrative cost of updating internal compliance records, manuals and references falls on those same parties.\n- Who decides: A CASA delegate exercised the decision‑making power under subregulation 39.001(1) to revoke and re‑make the ADs (opening paragraph). The instrument does not expand or narrow the delegate’s discretion beyond that statutory authority.\n- Compliance burden: The instrument itself does not impose new substantive obligations or change technical requirements; it preserves existing obligations by re‑issuing them in the same form. Therefore ongoing compliance costs and operational behaviours required by the ADs remain unchanged. The main additional burden, if any, is administrative (updating document references to the newly issued instruments).\n- Implementation risk and uncertainty: Low, because the text says the re‑made ADs are identical to the latest published editions; that continuity reduces the risk of substantive surprises for operators (see Note).\n- Effects on private enterprise and markets: The measure maintains existing regulatory constraints on use, inspection, testing and retirement of compressed gas cylinders and related vessels used in civil aviation. Because substantive requirements are unchanged, there is no direct impact on competition, ownership or contract freedom beyond the prior effect of those ADs. Firms will need to ensure their compliance documentation cites the new instrument identifiers.\n\nOther practical points\n\n- The instrument is procedural rather than substantive: it changes the legal form and citation of the directives but, according to the instrument text, not their content (opening paragraph and Note).\n- Operators should check the attached re‑made ADs (the instrument indicates they are attached) and update records and manuals to reference the new instrument numbers (Schedule 1 lists the AD numbers and titles)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument explicitly limits itself to a procedural remaking of existing directives 'in exactly the same form'. There is no expansion of scope beyond the original airworthiness requirements for compressed gas cylinders."},"complexity_factors":["Very short instrument (under 300 words)","Only 2 substantive items in Schedule 1","No defined terms section","No cross-references to other legislation beyond the enabling regulation (subregulation 39.001(1))","Simple binary structure: (a) revoke, (b) remake","Explicit note confirming no substantive change to content"],"plain_english_summary":"**What this legislation does:**\n\nThis instrument is a formal decision by a CASA (Civil Aviation Safety Authority) delegate to **revoke and immediately remake** two specific Airworthiness Directives (ADs) relating to **compressed gas cylinders** used in aircraft.\n\n**Who it affects:**\n\n- **Aircraft operators and owners** who have compressed gas cylinders installed in their aircraft\n- **Maintenance organisations** responsible for inspecting and certifying these cylinders\n- **Manufacturers and suppliers** of filament wound fibre-glass high pressure vessels and gas cylinders\n\n**What are Airworthiness Directives?**\n\nThink of these as **mandatory safety bulletins**. When CASA identifies a safety issue with an aircraft part, they issue an AD requiring specific inspections, repairs, or replacements. Compliance is legally compulsory.\n\n**The two directives being remade:**\n\n- **AD/GAS/1 Amdt 7** — covers inspection, testing, and retirement requirements for compressed gas cylinders\n- **AD/GAS/2** — covers filament wound, fibre-glass, high pressure spherical vessels (specialised lightweight gas containers)\n\n**Why it matters:**\n\nThis is a **procedural housekeeping exercise**. The delegate is not changing the actual safety requirements — the Note explicitly states each directive is being \"re-made in exactly the same form\" as before. This type of instrument is typically used to:\n\n- Ensure the directives remain legally valid under current regulations\n- Correct technical or administrative issues with how the directives were originally issued\n- Consolidate or clarify the regulatory basis for the requirements\n\n**Bottom line:** If you operate aircraft with these cylinders, **nothing changes** — your existing compliance obligations stay exactly the same. This is just CASA tidying up the paperwork behind the scenes."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-compressed-gas-cylinders","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-compressed-gas-cylinders/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-compressed-gas-cylinders/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-compressed-gas-cylinders/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-compressed-gas-cylinders/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-compressed-gas-cylinders/documents"}}