{"id":"F2006B08740","name":"AD/DAUPHIN/29 - Main Rotor Mast","slug":"ad-dauphin-29-main-rotor-mast","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51982,"registerId":"commonwealth-F2006B08740-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DAUPHIN/29 - Main Rotor Mast","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\nAD/DAUPHIN/29 Main Rotor Mast  12/91 DM\n\nApplicability: All model 365N and F series helicopters fitted with Main Rotor Mast P/N 365A31- 1060-23, -25, 365A31-1179-20, -21 or 365A31-1179-03.\n\n \n\nRequirement: Action in accordance with Aerospatiale Mandatory Service Bulletin 05.04 Revision 2. Compliance:              As specified in the Requirement Document.\n\nBackground: The manufacturer requires the mast to be inspected for corrosion pits that could initiate fatigue cracks.\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":1569},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow, technical scope: mandating safety inspections on a specific helicopter component to prevent fatigue failure. It has not expanded beyond this specific safety purpose."},"complexity_factors":["Single discrete technical requirement with no exceptions or conditional logic","Narrow applicability limited to specific aircraft models and five specific part numbers","Technical inspection details incorporated by reference to external service bulletin rather than set out in full","No defined terms, interpretive provisions, or penalty clauses included in the instrument itself"],"plain_english_summary":"This mandatory Airworthiness Directive requires owners/operators of Eurocopter SA 360 and SA 365 (365N and F with specified main rotor mast part numbers) to inspect the main rotor mast for corrosion pits per the manufacturer’s service bulletin. Corrosion pits can grow into fatigue cracks that may lead to mast failure and rotor detachment; the inspections aim to detect and address damage before it causes catastrophic loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dauphin-29-main-rotor-mast","history":"/api/acts/ad-dauphin-29-main-rotor-mast/history","analysis":"/api/acts/ad-dauphin-29-main-rotor-mast/analysis","conflicts":"/api/acts/ad-dauphin-29-main-rotor-mast/conflicts","importantCases":"/api/acts/ad-dauphin-29-main-rotor-mast/important-cases","documents":"/api/acts/ad-dauphin-29-main-rotor-mast/documents"}}