{"id":"F2006B09346","name":"AD/ECUREUIL/4 - Main Rotor Shaft Star Drive Adapter - Inspection","slug":"ad-ecureuil-4-main-rotor-shaft-star-drive-adapter-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53566,"registerId":"commonwealth-F2006B09346-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ECUREUIL/4 - Main Rotor Shaft Star Drive Adapter - Inspection","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 AS 350 (Ecureuil) Series Helicopters\n\n \n\n# AD/ECUREUIL/4 Main Rotor Shaft Star Drive Adapter - Inspection\n\nApplicability: All models fitted with main rotor shaft assembly P/N 350A.37.0003. Document: AS 350 SB 65.01.\n\n# 8/79\n\nCompliance: Within 25 hours time in service after 5 July 1979, and thereafter in accordance with paragraph D(2) of the requirement document.\n\n \n\nBackground: It is possible to install the rotating star drive adapter incorrectly on the rotor shaft.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive, as provided, establishes an inspection requirement for all AS 350 helicopters fitted with P/N 350A.37.0003 and specifies an initial and ongoing inspection timetable tied to AS 350 SB 65.01. The text does not indicate any expansion or narrowing of scope compared with the content of the directive itself."},"complexity_factors":["Narrow technical scope (single part: main rotor shaft assembly P/N 350A.37.0003) limits breadth of issues.","Dependence on an external manufacturer document (AS 350 SB 65.01) and a specific paragraph (D(2)) for procedural detail increases compliance dependency.","A definitive, short initial compliance window (25 hours after 5 July 1979) imposes scheduling pressure for affected operators.","Technical nature of the inspection requires maintenance expertise to carry out and interpret results.","Directive text does not include corrective actions or cost/penalty details, requiring consultation of additional sources for full implementation."],"plain_english_summary":"This directive mandates operators of Eurocopter AS 350 (Ecureuil) helicopters fitted with main rotor shaft assembly P/N 350A.37.0003 to inspect the main rotor shaft star drive adapter—first within 25 hours TIS after 5 July 1979 and thereafter per paragraph D(2) of manufacturer AS 350 SB 65.01.  \n\nIt aims to detect possible incorrect installation of the rotating star drive adapter. Operators bear inspection and any follow‑up costs; the SB supplies the detailed procedure and intervals."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This appears to be the original 1979 Airworthiness Directive as issued. The scope remains tightly focused on the specific mechanical defect identified in the main rotor shaft star drive adapter. There is no evidence of scope creep in this extract."},"complexity_factors":["Very short document (approximately 150 words)","Only one defined term implicitly referenced (part number P/N 350A.37.0003)","Single compliance requirement with clear deadline (25 hours TIS after 5 July 1979)","No nested exceptions or conditional logic — straightforward mandatory inspection","Cross-reference to external service bulletin (AS 350 SB 65.01) but no internal cross-references within the instrument itself","No amendment history or transitional provisions included in this extract"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to **Eurocopter AS 350 (Ecureuil) series helicopters**.\n\n**What it requires:**\n- Owners and operators must **inspect the main rotor shaft star drive adapter** — a component that helps transfer power in the helicopter's rotor system.\n- The inspection must happen **within 25 hours of flying time after 5 July 1979**, and then continue on a schedule set out in the manufacturer's service bulletin (paragraph D(2)).\n\n**Why it matters:**\nThe rotating star drive adapter can be **installed incorrectly** on the rotor shaft. If this happens, it could lead to mechanical failure with potentially catastrophic consequences for flight safety.\n\n**Who must comply:**\nAnyone operating an AS 350 helicopter fitted with main rotor shaft assembly part number **350A.37.0003**.\n\n**Key document reference:**\nOperators must follow **AS 350 Service Bulletin 65.01** for the exact inspection procedure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ecureuil-4-main-rotor-shaft-star-drive-adapter-inspection","history":"/api/acts/ad-ecureuil-4-main-rotor-shaft-star-drive-adapter-inspection/history","analysis":"/api/acts/ad-ecureuil-4-main-rotor-shaft-star-drive-adapter-inspection/analysis","conflicts":"/api/acts/ad-ecureuil-4-main-rotor-shaft-star-drive-adapter-inspection/conflicts","importantCases":"/api/acts/ad-ecureuil-4-main-rotor-shaft-star-drive-adapter-inspection/important-cases","documents":"/api/acts/ad-ecureuil-4-main-rotor-shaft-star-drive-adapter-inspection/documents"}}