{"id":"F2009L03931","name":"AD/PR/8 - Hub Driving Centre - Modification - CANCELLED","slug":"ad-pr-8-hub-driving-centre-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":81330,"registerId":"commonwealth-F2009L03931-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Propellers - Variable Pitch - Dowty Roto","sectionType":"division","heading":"Propellers -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/8 | Hub Driving Centre - Modification | 12/2009 |\n| ------- | --------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                |\n| ------------ | ----------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 19 November 2009.                                                                                                 |\n| Background:  | This unique Australian AD specified action no later than January 1969 or within 2500 hours time in service. 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/8","sectionType":"part","heading":"AD/PR/8","content":"## AD/PR/8","sortOrder":1},{"sectionNumber":"Hub Driving Centre - Modification","sectionType":"part","heading":"Hub Driving Centre - Modification","content":"## Hub Driving Centre - Modification","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":1301},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates a specific 1960s-era airworthiness directive regarding propeller modifications. Rather than expanding scope, it eliminates a regulatory requirement, formally ending the obligation for operators to perform the specified hub driving centre modification."},"complexity_factors":["Single operative word ('CANCELLED') with no procedural requirements","No defined terms, interpretation section, or legislative cross-references","No conditional logic, exceptions, or temporal limitations beyond the cancellation date","Minimal background of one sentence explaining the rationale"],"plain_english_summary":"**What this does:** This document officially cancels an old aviation safety rule (called an Airworthiness Directive or AD) that previously required aircraft owners to modify the \"hub driving centre\" on certain Dowty Rotol variable pitch propellers.\n\n**Who it affects:** Owners and operators of aircraft fitted with these specific propellers, particularly older aircraft that have been in service for many years.\n\n**What changed:** The maintenance requirement (which originally had to be completed by January 1969 or within 2,500 hours of flight time) is now completely removed. The Civil Aviation Safety Authority cancelled this directive on 19 November 2009 because it was no longer necessary for safety.\n\n**Why it matters:** Aircraft operators no longer need to track this specific modification or ensure it has been performed, reducing paperwork and maintenance costs for affected aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pr-8-hub-driving-centre-modification-cancelled","history":"/api/acts/ad-pr-8-hub-driving-centre-modification-cancelled/history","analysis":"/api/acts/ad-pr-8-hub-driving-centre-modification-cancelled/analysis","conflicts":"/api/acts/ad-pr-8-hub-driving-centre-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pr-8-hub-driving-centre-modification-cancelled/important-cases","documents":"/api/acts/ad-pr-8-hub-driving-centre-modification-cancelled/documents"}}