{"id":"F2006B06336","name":"AD/PR/8 - Hub Driving Centre - Modification","slug":"ad-pr-8-hub-driving-centre-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47517,"registerId":"commonwealth-F2006B06336-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PR/8 - Hub Driving Centre - Modification","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\nAD/PR/8 Hub Driving Centre - Modification NK\n\nApplicability: All model (c) R184/4-30-4/50, (c) R193/4-30-4/50 and /61.\n\n \n\nDocument: Dowty Rotol Mod. No. (c) VP 2486 (SB Nos. 61-573A and 61-573B refer). Compliance:               Propeller model (c) R184/4-30-4/50.\n\n(a)     for hubs which have exceeded 2500 hours total time in service on 30 July 1968 - modify not later than 1 January 1969;\n\n \n\n(b)     for hubs which have completed less than 2500 hours time in service - modify before exceeding 2500 hours time in service.\n\n \n\nPropeller model (c) R193/4-30-4/50 and /61 - before installation following next overhaul completed after 30 July 1968.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1763},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow technical scope as a specific airworthiness modification targeting defined propeller models. It does not extend beyond its core safety purpose of mandating hub modifications based on usage hours or maintenance cycles."},"complexity_factors":["Multiple compliance pathways depending on specific propeller model variant","Conditional logic based on time-in-service thresholds (2,500 hours) and historical status dates (30 July 1968)","Cross-references to external technical documentation (Service Bulletins 61-573A/B, Modification No. VP 2486)","Specific terminology requiring aviation technical knowledge ('hub driving centre', 'overhaul', 'time in service')"],"plain_english_summary":"This AD mandates modification of Dowty Rotol variable-pitch propeller hub driving centres to prevent mechanical failure. It affects owners/operators of R184/4-30-4/50, R193/4-30-4/50 and related variants. For R184 units the hub must be modified by 1 January 1969 if it had >2,500 hours on 30 July 1968, or before reaching 2,500 total hours if below that mark then. For R193 variants the hub must be modified before reinstallation after the next overhaul following 30 July 1968, per Dowty Rotol Mod No. VP 2486."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pr-8-hub-driving-centre-modification","history":"/api/acts/ad-pr-8-hub-driving-centre-modification/history","analysis":"/api/acts/ad-pr-8-hub-driving-centre-modification/analysis","conflicts":"/api/acts/ad-pr-8-hub-driving-centre-modification/conflicts","importantCases":"/api/acts/ad-pr-8-hub-driving-centre-modification/important-cases","documents":"/api/acts/ad-pr-8-hub-driving-centre-modification/documents"}}