{"id":"F2006B08723","name":"AD/DAUPHIN/10 - Retirement Life - Flexible Couplings on MGB Input End","slug":"ad-dauphin-10-retirement-life-flexible-couplings-on-mgb-input-end","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51941,"registerId":"commonwealth-F2006B08723-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DAUPHIN/10 - Retirement Life - Flexible Couplings on MGB Input End","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)  Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters\n\n \n\n# AD/DAUPHIN/10  Retirement Life - Flexible Couplings on MGB Input End\n\nApplicability: All SA365C,SA365C1, SA365C2, SA365C3.\n\n \n\nDocument: Dauphin SB No. 01.12.\n\n \n\nNote: DGAC AD 83-182-17 (B) refers.\n\n \n\nCompliance: As detailed in the requirement document.\n\n# 2/84\n\n \n\nBackground: Several cases of cracks in the flexible coupling discs have been reported in service.\n\nAccordingly, the manufacturer advises a reduction in service life of the coupling discs.\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":1248},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow technical scope focused solely on establishing retirement life limits for flexible couplings on specific Dauphin helicopter models to address the identified cracking issue."},"complexity_factors":["Short, single-issue instrument with narrow applicability","Defers substantive technical requirements to an external document (Service Bulletin No. 01.12)","No conditional logic, exceptions, or nested definitions within the instrument text","Limited to four specific helicopter model variants"],"plain_english_summary":"**What this does:** This is a mandatory safety rule (called an Airworthiness Directive) that sets an expiry date — a \"retirement life\" — for specific helicopter parts.\n\n**Who it affects:** Operators of certain Eurocopter Dauphin helicopters (models SA365C, SA365C1, SA365C2, and SA365C3).\n\n**The requirement:** Owners must replace the flexible coupling discs located at the input end of the main gearbox (MGB) once they reach a specific age or number of flight hours. The exact retirement limits are found in the manufacturer's Service Bulletin No. 01.12, which is incorporated by reference.\n\n**Why it matters:** Several of these coupling discs have developed cracks during normal use. To prevent catastrophic failure, the manufacturer reduced the allowed service life of these parts. This directive makes that reduction legally binding for all Australian operators of these aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dauphin-10-retirement-life-flexible-couplings-on-mgb-input-end","history":"/api/acts/ad-dauphin-10-retirement-life-flexible-couplings-on-mgb-input-end/history","analysis":"/api/acts/ad-dauphin-10-retirement-life-flexible-couplings-on-mgb-input-end/analysis","conflicts":"/api/acts/ad-dauphin-10-retirement-life-flexible-couplings-on-mgb-input-end/conflicts","importantCases":"/api/acts/ad-dauphin-10-retirement-life-flexible-couplings-on-mgb-input-end/important-cases","documents":"/api/acts/ad-dauphin-10-retirement-life-flexible-couplings-on-mgb-input-end/documents"}}