{"id":"F2006B09284","name":"AD/DHE/9 - Engine Speed - Restriction","slug":"ad-dhe-9-engine-speed-restriction","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53342,"registerId":"commonwealth-F2006B09284-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHE/9 - Engine Speed - Restriction","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 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  De Havilland Piston Engines\n\n \n\nAD/DHE/9 Engine Speed - Restriction NK\n\nApplicability: Gipsy Queen 70, 70-2 and 70-3 engines not modified to Mod. G1704, and all Gipsy Queen 70 series fitted with single piece barrel propellers.\n\n \n\nDocument: 1. DH Special Propeller Technical Instruction No. 23; or 2. ANO 106.1.7.6.1, Issue 2.\n\nCompliance: Forthwith.\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":2424},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains a narrow, technical scope focused specifically on engine speed limitations for defined De Havilland engine models, consistent with the original intent of targeted airworthiness safety orders."},"complexity_factors":["Extremely brief text (under 150 words of substantive content)","Substantive operational requirements contained in externally referenced technical documents (incorporation by reference)","Technical applicability criteria requiring knowledge of specific engine modification designators"],"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 1998.\n\n**Who it affects:** Owners and operators of specific vintage aircraft engines: the De Havilland Gipsy Queen 70, 70-2, and 70-3 models that haven't been modified to 'Mod. G1704', plus any Gipsy Queen 70 series engines fitted with single-piece barrel propellers.\n\n**What it requires:** If you operate one of these engines, you must immediately ('forthwith') comply with engine speed restrictions detailed in two specific technical documents: either De Havilland Special Propeller Technical Instruction No. 23, or Airworthiness Notice 106.1.7.6.1, Issue 2. Essentially, you're required to limit how fast the engine can run to prevent safety issues with the propeller.\n\n**Why it matters:** This is a compulsory safety measure. Non-compliance means you cannot legally operate the aircraft, as these directives are legally binding under Commonwealth aviation law."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhe-9-engine-speed-restriction","history":"/api/acts/ad-dhe-9-engine-speed-restriction/history","analysis":"/api/acts/ad-dhe-9-engine-speed-restriction/analysis","conflicts":"/api/acts/ad-dhe-9-engine-speed-restriction/conflicts","importantCases":"/api/acts/ad-dhe-9-engine-speed-restriction/important-cases","documents":"/api/acts/ad-dhe-9-engine-speed-restriction/documents"}}