{"id":"F2006B06207","name":"AD/PHZL/31 Amdt 1 - SUPERSEDED","slug":"ad-phzl-31-amdt-1-superseded","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47091,"registerId":"commonwealth-F2006B06207-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHZL/31 Amdt 1 - SUPERSEDED","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Propellers - Variable Pitch - Hartzell\n\n \n\nAD/PHZL/31\n\nAmdt 1\n\n\nSUPERSEDED 1/74\n\n \n\nSUPERSEDED by AD/PHZL/36 Amdt 2.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The supplied record explicitly marks AD/PHZL/31 Amdt 1 as superseded (lines: \"SUPERSEDED 1/74\" and \"SUPERSEDED by AD/PHZL/36 Amdt 2\"). That indicates the regulatory scope or requirements associated with AD/PHZL/31 were replaced by a later directive (AD/PHZL/36 Amdt 2). The supplied text does not state how the scope changed in substance; to identify the substantive change in scope, one must compare the full texts of AD/PHZL/31 Amdt 1 and AD/PHZL/36 Amdt 2."},"complexity_factors":["Document is an index/status record with no operative content (no technical requirements, dates, or instructions).","Chain of supersession (multiple supersession lines) requires cross-referencing other ADs to determine current obligations.","Regulatory context reference (Civil Aviation Regulations PART 39) implies procedural connections that are not spelled out in the excerpt.","Sparse textual content creates ambiguity about who exactly bears costs and what actions were mandated; resolving that requires external documents."],"plain_english_summary":"# What this instrument is and what it does\n\n- This entry is a record in the Civil Aviation Safety Authority's Schedule of Airworthiness Directives (Civil Aviation Regulations 1998, PART 39 - 107) for a propeller matter titled \"Propellers - Variable Pitch - Hartzell\" (see heading: \"AD/PHZL/31 Amdt 1\").\n- Mechanically, the document records the existence of an airworthiness directive given the identifying code AD/PHZL/31 (Amendment 1) and notes its status as superseded. The text explicitly records two supersession facts: a line reading \"SUPERSEDED 1/74\" and the statement \"SUPERSEDED by AD/PHZL/36 Amdt 2.\" Those lines indicate the AD is no longer current and has been replaced by a later directive (AD/PHZL/36 Amdt 2) (see: \"AD/PHZL/31 Amdt 1\" and \"SUPERSEDED by AD/PHZL/36 Amdt 2\").\n\n# Who this is likely to affect\n\n- The subject heading identifies the technical scope as variable-pitch Hartzell propellers. That ties the record to aircraft, operators, maintenance organisations, and owners responsible for aircraft fitted with Hartzell variable-pitch propellers (see heading: \"Propellers - Variable Pitch - Hartzell\").\n\n# Why it matters (mechanically)\n\n- Entries in the Schedule of Airworthiness Directives are part of the Civil Aviation Regulations framework (see: \"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES\"). The entry matters because it documents the regulatory status of a particular AD and the chain of replacement (which AD is in force and which has been superseded).\n\n# What the supplied text does not include and what that implies for analysis\n\n- The supplied text contains only the header/record information and supersession notes. It contains no operative requirements, no compliance instructions, no effective dates, no stated costs, no penalty or enforcement provisions, and no technical findings or reasons for the directive. The document therefore does not itself specify who must pay for any work, what inspections or replacements are required, or what the compliance burden is. (See absence of operative content beneath the AD heading.)\n\n# Practical consequences and assessment pointers (source-grounded)\n\n- To know the actual obligations, costs, and implementation risks, a reader must consult the full text of AD/PHZL/31 (the original AD) and the superseding instrument AD/PHZL/36 Amdt 2. The supplied record only indicates that AD/PHZL/31 Amdt 1 is no longer current and has been replaced (see: \"SUPERSEDED by AD/PHZL/36 Amdt 2\").\n- From the supplied lines alone, one can only say: who pays and the compliance burden are unspecified in this excerpt; the decision that changed the requirement is recorded (the later AD identifier), but the content of that decision (what changed, why, and how much it costs) is not in the supplied text.\n\n# Implementation and oversight notes\n\n- The entry sits in the CASA Schedule of Airworthiness Directives, so operational authority and any enforcement action would be managed through that regulatory framework (see: header referencing Civil Aviation Regulations 1998 PART 39 - 107). The excerpt provides no further detail on discretionary powers, timelines, or administrative procedure.\n\n# Source citations\n\n- Document heading: \"AD/PHZL/31 Amdt 1\".\n- Status lines: \"SUPERSEDED 1/74\" and \"SUPERSEDED by AD/PHZL/36 Amdt 2.\" \n- Regulatory context: \"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES.\"\n\n(Conclusion: the supplied text is an archival/status record naming an airworthiness directive for Hartzell variable-pitch propellers and showing it has been superseded; it contains no operative provisions or cost/compliance details.)"},"kimi_summary":{"content_quality":"rejected","complexity_score":1,"rejection_reason":"This is a header/navigation page for a superseded Airworthiness Directive containing no substantive legislative text, operative provisions, or regulatory requirements. It consists only of metadata, document identifiers, and a supersession notice. No analysable legislative content is present.","scope_assessment":{"changed":false,"description":"Not applicable — this is a navigation/header page for a superseded instrument with no substantive content to assess."},"complexity_factors":["Document contains no substantive legislative text — only metadata, title, and supersession notice","No defined terms, operative provisions, or conditional logic present","Consists entirely of document header information and a single-line replacement notice","No cross-references to other legislation or regulatory provisions"],"plain_english_summary":"This document is a **superseded Airworthiness Directive** issued by the Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it is:** An Airworthiness Directive (AD) is a mandatory safety notice that requires aircraft owners or operators to perform specific inspections, repairs, or modifications to address unsafe conditions in aircraft, engines, or components.\n\n**What this specific AD covers:** This directive (AD/PHZL/31 Amendment 1) related to **Hartzell variable-pitch propellers** — these are propellers whose blade angles can be adjusted during flight to optimise performance.\n\n**Why it matters:** This version has been **superseded** (replaced) by a newer directive, AD/PHZL/36 Amendment 2. This means the requirements in this document are no longer current, and anyone responsible for maintaining aircraft with these propellers must follow the newer directive instead.\n\n**Who it affects:** Aircraft operators, maintenance engineers, and owners of aircraft fitted with affected Hartzell propellers.\n\n**Key takeaway:** This is a historical document kept for reference purposes only. It has no current legal force."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phzl-31-amdt-1-superseded","history":"/api/acts/ad-phzl-31-amdt-1-superseded/history","analysis":"/api/acts/ad-phzl-31-amdt-1-superseded/analysis","conflicts":"/api/acts/ad-phzl-31-amdt-1-superseded/conflicts","importantCases":"/api/acts/ad-phzl-31-amdt-1-superseded/important-cases","documents":"/api/acts/ad-phzl-31-amdt-1-superseded/documents"}}