{"id":"F2006B06160","name":"AD/PDH/1 - Model 3/1000/2 - Hub Modification","slug":"ad-pdh-1-model-3-1000-2-hub-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46973,"registerId":"commonwealth-F2006B06160-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PDH/1 - Model 3/1000/2 - Hub 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 - De Havilland\n\n \n\nAD/PDH/1 Model 3/1000/2 - Hub Modification NK\n\nApplicability: All model 3/1000/2 propellers fitted to Dove aircraft.\n\n \n\nDocument: 1. Replace all single piece propeller hubs with two piece type hubs; or 2. ANO 107.1.4.5.5.1.\n\nCompliance: Before installation in an aircraft.\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":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1366},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow technical scope — a specific safety modification for a specific propeller model on a specific aircraft type. No evidence of expansion into broader operational or certification matters."},"complexity_factors":["References external technical document (ANO 107.1.4.5.5.1) that requires specialist aviation engineering knowledge to interpret","Assumes familiarity with Airworthiness Directive compliance frameworks and aircraft maintenance terminology","Extremely concise format (under 100 words) provides minimal context or explanatory notes"],"plain_english_summary":"**What this is:** An Airworthiness Directive — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations.\n\n**What it requires:** If you own, operate, or maintain a De Havilland Dove aircraft fitted with a Model 3/1000/2 variable-pitch propeller, you must replace any single-piece propeller hub with a two-piece hub **before** installing it on an aircraft.\n\n**Who it affects:**\n- Aircraft operators flying De Havilland Dove aircraft\n- Licensed aircraft maintenance engineers\n- Owners of these specific propellers\n\n**Why it matters:** The original single-piece hub design has a safety defect. This directive prevents unsafe propellers from being fitted to aircraft by mandating a design change to the hub assembly.\n\n**How to comply:** You have two options:\n1. Replace all single-piece hubs with two-piece hubs; or\n2. Follow the alternative technical standard **ANO 107.1.4.5.5.1** (an older airworthiness notice)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-pdh-1-model-3-1000-2-hub-modification","history":"/api/acts/ad-pdh-1-model-3-1000-2-hub-modification/history","analysis":"/api/acts/ad-pdh-1-model-3-1000-2-hub-modification/analysis","conflicts":"/api/acts/ad-pdh-1-model-3-1000-2-hub-modification/conflicts","importantCases":"/api/acts/ad-pdh-1-model-3-1000-2-hub-modification/important-cases","documents":"/api/acts/ad-pdh-1-model-3-1000-2-hub-modification/documents"}}