{"id":"F2006B06161","name":"AD/PDH/2 - Model 3/1000/2 - Propeller Retaining Nut - Inspection","slug":"ad-pdh-2-model-3-1000-2-propeller-retaining-nut-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46975,"registerId":"commonwealth-F2006B06161-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PDH/2 - Model 3/1000/2 - Propeller Retaining Nut - Inspection","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/2 Model 3/1000/2 - Propeller Retaining Nut - Inspection NK\n\nApplicability: All model 3HFB (3/1000/2) propellers. Document: 1. DH Tech. Bulletin Series 3HFB No. 50; or\n\n2. ANO 107.1.4.5.6.1.\n\n \n\nCompliance: As detailed in the requirement document.\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":2030},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope as a specific safety maintenance requirement for a defined propeller model. It has not expanded beyond the original purpose of ensuring airworthiness of the retaining nut assembly."},"complexity_factors":["Single operational requirement limited to one mechanical component","No definitions section or interpretive provisions","Minimal cross-referencing (only two external technical documents)","No conditional exceptions, triggers, or nested logic"],"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 does:** Requires aircraft owners and operators to inspect the **propeller retaining nuts** on specific De Havilland propellers (model 3HFB, also designated 3/1000/2). These nuts are critical safety components—they hold the propeller blades to the hub. If one fails, the blade could detach in flight.\n\n**Who it affects:** Anyone operating aircraft fitted with these specific propeller models.\n\n**What you must do:** Carry out inspections of the retaining nuts strictly in accordance with the procedures and timing specified in either:\n* De Havilland Technical Bulletin Series 3HFB No. 50; or  \n* Air Navigation Order 107.1.4.5.6.1.\n\nThe directive doesn't detail the inspection steps itself; it simply makes compliance with those external technical documents legally mandatory."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pdh-2-model-3-1000-2-propeller-retaining-nut-inspection","history":"/api/acts/ad-pdh-2-model-3-1000-2-propeller-retaining-nut-inspection/history","analysis":"/api/acts/ad-pdh-2-model-3-1000-2-propeller-retaining-nut-inspection/analysis","conflicts":"/api/acts/ad-pdh-2-model-3-1000-2-propeller-retaining-nut-inspection/conflicts","importantCases":"/api/acts/ad-pdh-2-model-3-1000-2-propeller-retaining-nut-inspection/important-cases","documents":"/api/acts/ad-pdh-2-model-3-1000-2-propeller-retaining-nut-inspection/documents"}}