{"id":"F2006B07992","name":"Airworthiness Directives 2004 - Revocation and Remaking - Propellers - Variable Pitch - Hoffman","slug":"airworthiness-directives-2004-revocation-and-remaking-propellers-variable-pitch-hoffman","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115045,"registerId":"commonwealth-F2006B07992-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 - Propellers - Variable Pitch - Hoffman","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 Propellers - Variable Pitch - Hoffman\n\n AD Name AD Number\n\n Blade Pitch Change Fork - Replacement AD/PHOF/1\n\n Propeller Hub AD/PHOF/2 Amdt 2\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This instrument performs a purely administrative function — revoking and remaking existing Airworthiness Directives in identical form. The scope remains exactly as originally intended: regulating safety requirements for specific Hoffman propeller models. No expansion of regulatory scope occurs."},"complexity_factors":["Very short instrument — only 2 substantive paragraphs plus schedule","No defined terms section — relies on external understanding of 'Airworthiness Directive' and propeller terminology","Minimal conditional logic — straightforward 'revoke and remake' structure","Only 2 items in Schedule 1","No cross-references to other legislation beyond the enabling regulation (Civil Aviation Safety Regulations 1998, subregulation 39.001(1))","Administrative 'machinery' instrument — remaking existing rules without substantive amendment"],"plain_english_summary":"This is a technical aviation safety instrument from 2004 that updates two specific safety rules about Hoffman variable-pitch aircraft propellers.\n\n**What it does:**\n- **Revokes** (cancels) two existing Airworthiness Directives — AD/PHOF/1 and AD/PHOF/2 Amdt 2\n- **Remakes** them as fresh, separate legal instruments in exactly the same form as before\n\n**What are Airworthiness Directives?**\nThese are mandatory safety instructions issued by the Civil Aviation Safety Authority (CASA). They require aircraft owners or operators to inspect, repair, or replace specific parts to prevent accidents. Think of them as compulsory \"recall notices\" for aircraft components.\n\n**Which propellers are affected?**\n- **AD/PHOF/1**: Concerns replacing the \"blade pitch change fork\" — a mechanical part that adjusts propeller blade angles during flight\n- **AD/PHOF/2 Amdt 2**: Concerns the propeller hub — the central component that holds the blades together\n\n**Why remake them?**\nAustralian aviation law requires Airworthiness Directives to be issued as separate legal instruments. This document is a housekeeping measure — bundling the revocation and remaking of these two Hoffman propeller directives into one administrative action. The safety requirements themselves haven't changed.\n\n**Who needs to care?**\n- Owners and operators of aircraft fitted with Hoffman variable-pitch propellers\n- Aircraft maintenance engineers\n- Aviation safety compliance officers"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope not changed. The instrument explicitly revokes the listed Airworthiness Directives and re-makes each one \"in exactly the same form as appears in the latest published edition of the Directive\" (Note). That statement indicates no substantive alteration to the directives' content or obligations; the action is administrative re-issuance under subregulation 39.001(1)."},"complexity_factors":["Instrument is narrowly procedural: revocation and re-making of listed directives rather than substantive regulatory change.","References a single statutory power (subregulation 39.001(1)) to perform the administrative act.","Relies on attached instruments and published editions — requires cross-checking with those documents to confirm content.","Multiple documents involved (original directives, published editions, and newly re-made instruments) increase practical steps for administrators and affected parties.","Potential for minor implementation risk if the re-made instruments do not exactly match the published editions (as the Note intends to avoid)."],"plain_english_summary":"The CASA delegate formally revokes two Hoffman variable‑pitch propeller airworthiness directives and re‑issues each as separate legal instruments in the exact form of their latest published editions. It affects the persons and organisations subject to those directives; the move is administrative—no substantive change to technical or compliance obligations—though recipients must rely on the newly re‑made instruments as the operative legal texts."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-propellers-variable-pitch-hoffman","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-propellers-variable-pitch-hoffman/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-propellers-variable-pitch-hoffman/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-propellers-variable-pitch-hoffman/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-propellers-variable-pitch-hoffman/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-propellers-variable-pitch-hoffman/documents"}}