{"id":"F2006B06326","name":"AD/PR/27 Amdt 1 - Beta Tube","slug":"ad-pr-27-amdt-1-beta-tube","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47482,"registerId":"commonwealth-F2006B06326-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PR/27 Amdt 1 - Beta Tube","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 - Dowty Rotol\n\n \n\n# AD/PR/27\n\nAmdt 1\n\n\n\n\n \n\n \n\nCANCELLED.\n\n# Beta Tube 7/90\n\n \n\nBackground: As the Beta Tube is the subject of a Life Development programme this Directive is cancelled.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a cancellation instrument that narrows rather than expands regulatory scope. It removes a specific airworthiness requirement and replaces it with participation in a broader life-cycle monitoring programme. The scope has contracted to zero regulatory text while referring operators to an alternative compliance pathway."},"complexity_factors":["Extremely short document (under 200 words)","No defined terms section","No cross-references to other legislation","No conditional logic or exceptions","Single operative provision (cancellation) with brief explanatory background","Document is essentially a formal notice of revocation"],"plain_english_summary":"This document is an **Airworthiness Directive (AD)** — essentially a safety order issued by Australia's Civil Aviation Safety Authority (CASA) telling aircraft owners and operators what they must do to keep their planes safe.\n\n**What it does:**\n- **Cancels** a previous safety directive called \"AD/PR/27 Amdt 1\" that related to \"Beta Tubes\" on Dowty Rotol variable-pitch propellers (propellers that can change their blade angle).\n- A Beta Tube is a component in some propeller systems that helps control the propeller's pitch in the \"beta\" range (used for ground operations like taxiing and reverse thrust).\n\n**Why it matters:**\n- The original directive required certain inspections or actions on these propeller components.\n- This cancellation means those specific requirements are **no longer mandatory** because the \"Beta Tube\" is now covered by a different safety program — a \"Life Development programme\" (an ongoing engineering study that monitors the component's lifespan and wear patterns instead of fixed inspection intervals).\n\n**Who it affects:**\n- Aircraft operators and maintenance organisations using Dowty Rotol variable-pitch propellers with Beta Tubes.\n- They no longer need to comply with the specific requirements of the cancelled directive, but must follow the replacement Life Development programme instead."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"This instrument changes scope by removing (cancelling) AD/PR/27 Amdt 1. The text effectually withdraws the previously issued airworthiness directive concerning the Beta Tube (operative line: \"CANCELLED.\") and explains the reason as the Beta Tube being \"the subject of a Life Development programme\" (Background line). The document does not specify replacement requirements, transitional arrangements, or the content/schedule of the referenced Life Development programme."},"complexity_factors":["Document is extremely short and consists principally of a single operative word: \"CANCELLED.\"","No operative compliance obligations, timelines, affected parties, or technical instructions are included in the text.","Decision rationale is a single line referencing an external \"Life Development programme,\" creating dependence on supplementary material not contained here.","Regulatory context is implied by the header (Civil Aviation Safety Authority, Civil Aviation Regulations 1998, Part 39) but procedural detail and scope limits are absent."],"plain_english_summary":"This instrument formally cancels Airworthiness Directive AD/PR/27 Amdt 1, which concerned the Beta Tube for Dowty Rotol variable‑pitch propellers, removing that specific legal obligation. \n\nThe document names the Civil Aviation Safety Authority as issuer and cites the cancellation reason — the Beta Tube is subject to a \"Life Development programme\" — but sets no replacement requirements, timelines, affected parties, or cost/implementation details."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pr-27-amdt-1-beta-tube","history":"/api/acts/ad-pr-27-amdt-1-beta-tube/history","analysis":"/api/acts/ad-pr-27-amdt-1-beta-tube/analysis","conflicts":"/api/acts/ad-pr-27-amdt-1-beta-tube/conflicts","importantCases":"/api/acts/ad-pr-27-amdt-1-beta-tube/important-cases","documents":"/api/acts/ad-pr-27-amdt-1-beta-tube/documents"}}