{"id":"F2006B09069","name":"AD/DHC-3/20 - Mixture Control Lever Quadrant","slug":"ad-dhc-3-20-mixture-control-lever-quadrant","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52831,"registerId":"commonwealth-F2006B09069-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-3/20 - Mixture Control Lever Quadrant","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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  DHC-3 (Otter) Series Aeroplanes\n\n \n\nAD/DHC-3/20 Mixture Control Lever Quadrant 2/64\n\nApplicability: All models.\n\n \n\nRequirement: Mark or remark the mixture control lever quadrant to indicate clearly the following positions:\n\n \n\n(a)     The minimum lean position - to be designated “LEAN”.\n\n \n\n(b)     The rearmost position - to be designated “CUT-OFF”.\n\n \n\nThe minimum lean position of the mixture control lever is the rear-most position it can reach without operating the idle cut-off valve.\n\n \n\nCompliance: Forthwith.\n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1335},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow technical scope—addressing a specific safety labeling requirement for mixture controls on DHC-3 Otter aircraft. There is no indication of expansion beyond this original safety purpose."},"complexity_factors":["Extremely short (approximately 100 words)","Single unambiguous requirement with no exceptions, conditions, or nested clauses","No defined terms or cross-references to other legislation","Simple mechanical instruction requiring no legal interpretation"],"plain_english_summary":"This is an aviation safety directive for DHC-3 Otter aircraft (a type of bush plane). It requires owners to clearly label the **mixture control lever** (the control that adjusts how much fuel mixes with air in the engine) with two specific markings:\n\n* **\"LEAN\"** — marking the minimum lean position (the furthest back the lever can go without cutting off the engine)\n* **\"CUT-OFF\"** — marking the rearmost position (which stops fuel flow to shut down the engine)\n\nThe goal is to prevent pilots from accidentally shutting down the engine when they only want to lean the fuel mixture, or vice versa. This applies to all DHC-3 models and must be done immediately."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-3-20-mixture-control-lever-quadrant","history":"/api/acts/ad-dhc-3-20-mixture-control-lever-quadrant/history","analysis":"/api/acts/ad-dhc-3-20-mixture-control-lever-quadrant/analysis","conflicts":"/api/acts/ad-dhc-3-20-mixture-control-lever-quadrant/conflicts","importantCases":"/api/acts/ad-dhc-3-20-mixture-control-lever-quadrant/important-cases","documents":"/api/acts/ad-dhc-3-20-mixture-control-lever-quadrant/documents"}}