{"id":"F2006B06205","name":"AD/PHZL/27 - SUPERSEDED","slug":"ad-phzl-27-superseded","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47086,"registerId":"commonwealth-F2006B06205-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PHZL/27 - SUPERSEDED","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET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OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Propellers - Variable Pitch - Hartzell\n\n \n\nAD/PHZL/27 SUPERSEDED 1/74\n\nSUPERSEDED by AD/PHZL/36.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The entry explicitly states that AD/PHZL/27 has been superseded by AD/PHZL/36 (lines: \"AD/PHZL/27 SUPERSEDED 1/74\" and \"SUPERSEDED by AD/PHZL/36\"). That means AD/PHZL/27 is no longer the operative directive; the scope of enforceable requirements has therefore changed and is now determined by AD/PHZL/36. The excerpt does not provide the text of either AD, so the precise nature or extent of the scope change (which inspections, modifications, affected serial numbers, or compliance windows were added, removed, or altered) cannot be determined from this source alone."},"complexity_factors":["Source entry contains almost no substantive regulatory text (only identifier, subject heading, and supersession note).","No compliance requirements, technical instructions, or implementation dates are provided in the excerpt.","Supersession is noted (AD/PHZL/36) but the replacement directive text is not present, leaving required actions ambiguous.","Ambiguous date notation (\"1/74\") without context as to whether it is issue, supersession date, or catalogue reference.","Regulatory context is clear (Schedule of Airworthiness Directives), reducing structural complexity despite missing content."],"plain_english_summary":"*What this entry is and does*\n\nThis record is an entry from the Civil Aviation Safety Authority's Schedule of Airworthiness Directives (listed under the Commonwealth of Australia, Civil Aviation Regulations 1998, Part 39). It names an airworthiness directive as \"AD/PHZL/27\" concerning \"Propellers - Variable Pitch - Hartzell.\" The entry itself does not include the directive text or compliance steps. The only operative information in the entry is that AD/PHZL/27 is marked \"SUPERSEDED\" (noted as \"SUPERSEDED 1/74\") and that it was \"SUPERSEDED by AD/PHZL/36.\"\n\n*Who this affects, mechanically*\n\n- The identifier and heading show the directive was targeted at Hartzell variable‑pitch propellers. (See: \"Propellers - Variable Pitch - Hartzell\" and \"AD/PHZL/27\".)\n- Because this appears in the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, the practical addressees are the persons and organisations who operate, maintain or certify aircraft fitted with the affected Hartzell propellers. The Schedule is the instrument that records mandatory airworthiness directives (see header: \"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES\").\n\n*What changed and why you need to check further*\n\n- AD/PHZL/27 is no longer the active directive because the entry explicitly states it has been superseded (\"AD/PHZL/27 SUPERSEDED 1/74\" and \"SUPERSEDED by AD/PHZL/36\"). Mechanically, that means AD/PHZL/36 is the subsequent directive that contains the current requirements or corrections; AD/PHZL/27 should not be relied on for current compliance.\n- This entry does not set out the original required inspections, modifications, or corrective actions, nor does it include dates, compliance windows, or technical instructions. To determine current obligations, costs, and technical steps, affected parties must consult the text of AD/PHZL/36 (the superseding directive) and any referenced service material.\n\n*Who pays, who decides, and what behaviour changes*\n\n- Who decides: the Civil Aviation Safety Authority (CASA) is the issuing authority for entries in this Schedule (per the header). The Schedule records CASA's airworthiness directives.\n- Who pays: because the entry concerns an airworthiness directive for a specific component, the financial costs of meeting any required inspections, repairs, modifications or parts would fall on the aircraft owners/operators and their maintenance organisations. The entry itself does not allocate costs or provide funding.\n- What behaviour changes: operators/maintainers must follow the operative directive. Since AD/PHZL/27 has been superseded, the immediate behavioural change is to stop relying on AD/PHZL/27 and to obtain and comply with AD/PHZL/36.\n\n*Implementation, compliance burden and uncertainty risks*\n\n- Implementation burden cannot be assessed from this entry because the technical and compliance content is not present. The entry increases practical uncertainty until the text of AD/PHZL/36 is consulted.\n- Administrative discretion: the Schedule records directives; any decisions about applicability, compliance timing, or approvals of alternate methods of compliance would be governed by the CASA processes and by the text of the operative AD (not included here).\n\n*Bottom line*\n\nThis is a record showing that the Hartzell variable‑pitch propeller airworthiness directive numbered AD/PHZL/27 has been superseded and replaced by AD/PHZL/36. To know what actions are required, who exactly must act, the timing, and the costs, consult AD/PHZL/36 and any referenced technical material."},"kimi_summary":{"content_quality":"rejected","complexity_score":1,"rejection_reason":"This is a navigation/placeholder page indicating that Airworthiness Directive AD/PHZL/27 has been superseded. It contains no substantive legislative content — only a header, metadata, and a notice that it has been replaced by AD/PHZL/36. There are no operative provisions, requirements, or meaningful legal text to analyse.","scope_assessment":{"changed":false,"description":"Not applicable — this is a superseded directive with no current operative scope. The document's only purpose is to redirect users to the current version."},"complexity_factors":["Document is a stub/placeholder indicating supersession status only","No operative provisions, technical requirements, or procedural instructions remain","Single cross-reference to replacement directive (AD/PHZL/36)","No defined terms, conditions, or exceptions","Extremely short — essentially a notification of obsolescence"],"plain_english_summary":"This document is a **superseded Airworthiness Directive** (AD) issued by the Civil Aviation Safety Authority (CASA). \n\n**What it is:** An Airworthiness Directive is a mandatory safety notice that tells aircraft owners and operators they must fix or inspect specific parts of their aircraft to keep them safe to fly.\n\n**What this specific one did:** AD/PHZL/27 originally applied to **Hartzell variable-pitch propellers** — these are aircraft propellers that can change their blade angle to adjust thrust. The directive required certain safety actions to address defects or unsafe conditions in these propellers.\n\n**Why it matters now:** This directive has been **superseded** (replaced) by a newer directive, AD/PHZL/36. This means aircraft operators must now follow the newer rules instead of this one. The document serves as a historical record showing what safety requirements previously applied and what has replaced them.\n\n**Who it affects:** Aircraft owners, operators, and maintenance engineers who work with Hartzell variable-pitch propellers on Australian-registered aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phzl-27-superseded","history":"/api/acts/ad-phzl-27-superseded/history","analysis":"/api/acts/ad-phzl-27-superseded/analysis","conflicts":"/api/acts/ad-phzl-27-superseded/conflicts","importantCases":"/api/acts/ad-phzl-27-superseded/important-cases","documents":"/api/acts/ad-phzl-27-superseded/documents"}}