{"id":"F2009L03933","name":"AD/PR/21 - Hub Assembly - Inspection of Blade Sockets - CANCELLED","slug":"ad-pr-21-hub-assembly-inspection-of-blade-sockets-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":81336,"registerId":"commonwealth-F2009L03933-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Propellers - Variable Pitch - Dowty Roto","sectionType":"division","heading":"Propellers - Variable Pitch - Dowty Rotol","content":"### Propellers - Variable Pitch - Dowty Rotol\n\n| AD/PR/21 | Hub Assembly - Inspection of Blade Sockets | 12/2009 |\n| -------- | ------------------------------------------ | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                          |\n| ------------ | ----------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 19 November 2009.                                                                                           |\n| Background:  | This unique Australian AD applied to propellers installed on Armstrong-Whitworth Argosy 222 aircraft. The AD is no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n30 September 2009","sortOrder":0},{"sectionNumber":"AD/PR/21","sectionType":"part","heading":"AD/PR/21","content":"## AD/PR/21","sortOrder":1},{"sectionNumber":"Hub Assembly - Inspection of Blade Socke","sectionType":"part","heading":"Hub Assembly - Inspection of Blade Sockets","content":"## Hub Assembly - Inspection of Blade Sockets","sortOrder":2},{"sectionNumber":"12/2009","sectionType":"part","heading":"12/2009","content":"## 12/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2323},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates the previous AD entirely rather than expanding its scope. The original purpose was to regulate safety for specific propellers until the risk passed; this instrument simply declares that purpose fulfilled."},"complexity_factors":["Single operative provision (cancellation statement)","No defined terms requiring interpretation","No conditional logic, exceptions, or procedural steps","No cross-references to other legislation beyond identifying the cancelled AD"],"plain_english_summary":"**What this is:** This document officially cancels an existing aviation safety rule (called an **Airworthiness Directive** or AD) that previously required special inspections of propeller parts on specific aircraft.\n\n**What it did:** The original rule required owners to inspect the **blade sockets** (the fittings that hold the propeller blades) on Dowty Rotol variable-pitch propellers. These specific propellers were only installed on **Armstrong-Whitworth Argosy 222** aircraft.\n\n**Who it affects:** Anyone who operates these specific aircraft. However, since this document cancels the rule effective **19 November 2009**, **no one needs to follow this inspection requirement anymore**.\n\n**Why it matters:** The safety risk that originally justified these inspections no longer exists—likely because these aircraft are no longer flying in Australia. This removes an unnecessary regulatory burden and compliance cost for operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pr-21-hub-assembly-inspection-of-blade-sockets-cancelled","history":"/api/acts/ad-pr-21-hub-assembly-inspection-of-blade-sockets-cancelled/history","analysis":"/api/acts/ad-pr-21-hub-assembly-inspection-of-blade-sockets-cancelled/analysis","conflicts":"/api/acts/ad-pr-21-hub-assembly-inspection-of-blade-sockets-cancelled/conflicts","importantCases":"/api/acts/ad-pr-21-hub-assembly-inspection-of-blade-sockets-cancelled/important-cases","documents":"/api/acts/ad-pr-21-hub-assembly-inspection-of-blade-sockets-cancelled/documents"}}