{"id":"F2006B07968","name":"Airworthiness Directives 2004 - Revocation and Remaking - Porsche Piston Engines","slug":"airworthiness-directives-2004-revocation-and-remaking-porsche-piston-engines","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115015,"registerId":"commonwealth-F2006B07968-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Airworthiness Directives 2004 - Revocation and Remaking - Porsche Piston Engines","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 Porsche Piston Engines\n\n AD Name AD Number\n\n Camshaft Oil Feed Pipes AD/PORSCHE/1\n\n Engine - Output Shaft Bearing AD/PORSCHE/2\n\n Valve Springs AD/PORSCHE/3\n\n Drive Shaft Teeth AD/PORSCHE/4\n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument does not change the substantive scope or content of the affected Airworthiness Directives. It revokes the listed ADs and re‑makes each as a separate instrument \"in exactly the same form as appears in the latest published edition\" (see Note and Schedule 1), so the legal obligations in those ADs remain unchanged."},"complexity_factors":["Procedural instrument that revokes and reissues existing directives rather than changing technical content","Clear statutory authority cited (subregulation 39.001(1)), limiting legal complexity","Small, finite list of affected ADs (four items in Schedule 1)","No technical aeronautical details in this instrument; substantive rules remain in the attached ADs","Potential minor administrative complexity in tracking revoked vs re‑made instrument citations"],"plain_english_summary":"What this instrument does (mechanical change)\n\n- The delegate of the Civil Aviation Safety Authority (David Alan Villiers) uses the power in subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998 to revoke a set of existing Airworthiness Directives (ADs) and to re‑issue each of them as separate instruments (see opening paragraph and (a)–(b)).\n- The instrument lists the four affected ADs in Schedule 1. They concern Porsche piston engines and are identified as: AD/PORSCHE/1 (Camshaft Oil Feed Pipes), AD/PORSCHE/2 (Engine - Output Shaft Bearing), AD/PORSCHE/3 (Valve Springs) and AD/PORSCHE/4 (Drive Shaft Teeth) (see Schedule 1).\n- The instrument expressly states that each attached AD is being re‑made in exactly the same form as appears in the latest published edition of the Directive (see Note). That means the legal text of each AD is not being substantively changed by this instrument.\n\nWhy the instrument exists (stated purpose) and how that interacts with practical effects\n\n- The stated action is procedural: revoke and re‑make the listed ADs as separate instruments (opening paragraph and (a)–(b)). The Note states the re‑made ADs are identical in form to their latest published editions. That is the instrument’s declared purpose.\n- Practical effect: because the Note says the content is identical, this instrument does not, by itself, introduce new technical requirements for operators or aircraft owners. Any substantive obligations remain those already contained in the existing AD texts (Note; Schedule 1).\n\nWho decides, who pays, and what behaviour changes (source‑grounded)\n\n- Who decides: the decision is taken by the delegate of the Civil Aviation Safety Authority, David Alan Villiers, acting under subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998 (opening paragraph).\n- Who pays: the instrument does not set out new fees or monetary obligations. Because it remakes the ADs in the same form as the existing published directives, it does not, by itself, create new compliance costs beyond those already required by the existing ADs (Note). The instrument itself does not identify any party required to pay a specific charge.\n- What behaviour changes: the instrument changes the legal form and numbering/packaging of the directives (revocation and separate re‑issuance). It does not change substantive compliance obligations contained in the AD texts, so affected operators/owners continue to follow the same technical requirements as before (Note; Schedule 1).\n\nCompliance burden, discretion, and implementation risk\n\n- Compliance burden: because the ADs are re‑made in identical form, the instrument does not increase substantive compliance burdens. Administrative tasks may arise from having separate instrument records or reissued instrument citations (Note; Schedule 1).\n- Bureaucratic discretion: the instrument exercises a procedural power under subregulation 39.001(1) to revoke and re‑issue instruments. The text records the delegate’s action and signature, showing delegated administrative authority is being used (opening paragraph; signature; date).\n- Implementation risk and trade‑offs: the primary implementation risk is administrative (confusion over revoked versus re‑made instrument citations). There is no textual indication of technical or safety changes in this instrument itself because the Note confirms the ADs are identical in form to their latest published editions.\n\nImmediate practical points for affected parties\n\n- If you operate or maintain aircraft using Porsche piston engines covered by the listed ADs, you should note the reissuance but expect the same substantive requirements to continue (Note; Schedule 1).\n- The relevant directives to track remain AD/PORSCHE/1 through AD/PORSCHE/4 as listed in Schedule 1.\n\nKey citations from the instrument\n\n- Legal authority: subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998 (opening paragraph).\n- Action taken: revoke and remake the ADs listed (opening paragraph; (a)–(b)).\n- Items affected: Schedule 1 lists the four Porsche ADs (Schedule 1).\n- Confirmation of unchanged text: the Note states the re‑made ADs are identical in form to their latest published editions (Note)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument maintains identical scope to the original 2004 directives. The explicit note states each directive is being 're-made in exactly the same form,' confirming this is purely administrative remaking without expansion of scope."},"complexity_factors":["Very short instrument (under 300 words)","Only 4 specific directives referenced by simple alphanumeric codes","Single operative provision with straightforward (a) and (b) structure","No defined terms section","No cross-references to other legislation beyond the enabling regulation (Civil Aviation Safety Regulations 1998, subregulation 39.001(1))","No conditional logic or exceptions","Explicit note confirming no substantive changes to the attached directives"],"plain_english_summary":"This is a technical aviation safety instrument that **revokes and immediately remakes four specific airworthiness directives** for Porsche piston aircraft engines.\n\n**What it does:**\n- **Revokes** four existing safety rules (Airworthiness Directives AD/PORSCHE/1 through AD/PORSCHE/4) that were originally made in 2004\n- **Remakes** those same four directives as brand new, separate legal instruments\n- The remade directives are **identical** to the previous versions — no changes to the actual safety requirements\n\n**Who it affects:**\n- Owners and operators of aircraft with **Porsche piston engines**\n- Aircraft maintenance engineers and organisations\n- The Civil Aviation Safety Authority (CASA) itself\n\n**Why it matters:**\nAirworthiness Directives are **legally binding safety orders** that require specific inspections, repairs, or modifications to aircraft components. This instrument is essentially an **administrative housekeeping exercise** — likely done to fix a technical legal issue with how the original 2004 directives were made, or to reissue them under updated regulation-making powers. The safety requirements themselves haven't changed, but the legal authority behind them has been refreshed.\n\nThe four directives cover:\n- **AD/PORSCHE/1:** Camshaft oil feed pipes\n- **AD/PORSCHE/2:** Engine output shaft bearing  \n- **AD/PORSCHE/3:** Valve springs\n- **AD/PORSCHE/4:** Drive shaft teeth"}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-porsche-piston-engines","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-porsche-piston-engines/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-porsche-piston-engines/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-porsche-piston-engines/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-porsche-piston-engines/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-porsche-piston-engines/documents"}}