{"id":"F2006B09278","name":"AD/DHE/3 - Propeller Oil Transfer System - Modification","slug":"ad-dhe-3-propeller-oil-transfer-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53319,"registerId":"commonwealth-F2006B09278-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHE/3 - Propeller Oil Transfer System - 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 - 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/3 Propeller Oil Transfer System - Modification NK\n\nApplicability: Gipsy Queen 70 series.\n\n \n\nDocument: 1. DH Mods G1331, G1493 and G1728; or 2. ANO 106.1.7.6.5.2.\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":1283},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original, focused scope: mandating a specific technical modification for a specific engine type. There is no evidence of scope creep or expansion into broader operational areas."},"complexity_factors":["Extremely narrow applicability (single engine series: Gipsy Queen 70)","Single, unconditional compliance requirement (before installation)","Refers to external technical documents for implementation details rather than incorporating them","No exceptions, exemptions, or alternative compliance paths stated in the instrument"],"plain_english_summary":"**What it is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority.\n\n**What it requires:** Before anyone installs a **Gipsy Queen 70 series** aircraft engine, the **propeller oil transfer system** must be modified according to specific De Havilland engineering instructions (Modifications G1331, G1493, and G1728) or an approved alternative standard (ANO 106.1.7.6.5.2).\n\n**Who it affects:** Aircraft maintenance engineers, repair stations, and operators who handle these vintage piston engines.\n\n**Why it matters:** The modification fixes a safety issue with the propeller oil transfer system. Without it, the propeller might not receive proper oil pressure, potentially causing engine failure or loss of propeller control during flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhe-3-propeller-oil-transfer-system-modification","history":"/api/acts/ad-dhe-3-propeller-oil-transfer-system-modification/history","analysis":"/api/acts/ad-dhe-3-propeller-oil-transfer-system-modification/analysis","conflicts":"/api/acts/ad-dhe-3-propeller-oil-transfer-system-modification/conflicts","importantCases":"/api/acts/ad-dhe-3-propeller-oil-transfer-system-modification/important-cases","documents":"/api/acts/ad-dhe-3-propeller-oil-transfer-system-modification/documents"}}