{"id":"F2006B08726","name":"AD/DAUPHIN/14 - Main Rotor Gearbox Oil Drain Plug - Inspection and Rework","slug":"ad-dauphin-14-main-rotor-gearbox-oil-drain-plug-inspection-and-rework","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51950,"registerId":"commonwealth-F2006B08726-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DAUPHIN/14 - Main Rotor Gearbox Oil Drain Plug - Inspection and Rework","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/14 Main Rotor Gearbox Oil Drain Plug - Inspection and Rework\n\n\n11/84\n\n \n\nApplicability:  All models fitted with main rotor gear box modified to A.M.S. 07-7149 condition. Requirement:  Aerospatiale S.B. 01-13.\n\nNote: Bureau Veritas AD 83-186-18(B) refers. Compliance: Within 25 hours time in service after 30 November 1984 or prior to the main gear box initial installation in an aircraft.\n\n \n\nBackground: The manufacturer deems it necessary to rework the transmission deck flange, to prevent damage to the drain plug union, which may result in the loss of main gear box oil.\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":2,"scope_assessment":{"changed":false,"description":"The directive does not broaden or narrow applicability beyond its stated target: it imposes a maintenance requirement on all SA 360/365 helicopters with the main gearbox modified to A.M.S. 07-7149. It replaces no general operational permissions or prohibitions; it prescribes a specific inspection/rework and a defined compliance window. (Applicability; Requirement; Compliance)"},"complexity_factors":["Narrow technical scope limited to specific helicopter models and a specific gearbox modification (A.M.S. 07-7149). (Applicability)","Single, concrete required action tied to an external service bulletin (Aerospatiale S.B. 01-13). (Requirement)","Short, fixed compliance window referencing a historical calendar date and a time-in-service limit (25 hours after 30/11/1984) or prior-to-installation alternative. (Compliance)","Cross-reference to another airworthiness directive (Bureau Veritas AD 83-186-18(B)), which may require consulting multiple documents. (Note)","Use of technical terms and part references (transmission deck flange, drain plug union) that require specialist maintenance knowledge to implement. (Background)"],"plain_english_summary":"The directive requires inspection and rework of the main rotor gearbox oil drain area on Eurocopter SA 360/365 (Dauphin) helicopters whose gearbox is modified to A.M.S. 07-7149, carried out per Aerospatiale Service Bulletin 01-13. \n\nIssued by CASA, compliance is mandatory within 25 flight hours after 30 Nov 1984 or before installing the gearbox, to prevent drain‑plug‑union damage and potential main gearbox oil loss."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1984 addressing a specific mechanical defect. It has not expanded beyond its original purpose of mandating inspection and rework of a particular gearbox component."},"complexity_factors":["Single, specific technical requirement referencing an external manufacturer document (Service Bulletin 01-13)","Narrow applicability limited to one specific helicopter series with one specific modification","Simple binary compliance condition (25 hours or before installation)","No defined terms section, no cross-references to other legislation beyond the enabling Civil Aviation Regulations","Straightforward background explanation without nested conditions or exceptions","Total length is approximately 150 words of substantive content"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for specific Eurocopter Dauphin helicopters.\n\n**What it does:**\n- Requires owners and operators of certain SA 360 and SA 365 Dauphin helicopters to inspect and rework the main rotor gearbox oil drain plug\n- The work must follow the manufacturer's Service Bulletin 01-13\n\n**Who it affects:**\n- Operators of Dauphin helicopters that have been modified with a specific gearbox upgrade (A.M.S. 07-7149)\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\n- The manufacturer identified a risk that the drain plug union could be damaged, potentially causing **complete loss of gearbox oil**\n- Loss of oil in the main rotor gearbox could lead to gearbox failure and catastrophic loss of the aircraft\n- This is a **mandatory** safety action — non-compliance grounds the aircraft\n\n**When it had to be done:**\n- Within 25 flight hours after 30 November 1984, or before installing the gearbox in an aircraft for the first time\n\n**Key point:** This is a retrospective safety fix for a design defect that could cause total mechanical failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dauphin-14-main-rotor-gearbox-oil-drain-plug-inspection-and-rework","history":"/api/acts/ad-dauphin-14-main-rotor-gearbox-oil-drain-plug-inspection-and-rework/history","analysis":"/api/acts/ad-dauphin-14-main-rotor-gearbox-oil-drain-plug-inspection-and-rework/analysis","conflicts":"/api/acts/ad-dauphin-14-main-rotor-gearbox-oil-drain-plug-inspection-and-rework/conflicts","importantCases":"/api/acts/ad-dauphin-14-main-rotor-gearbox-oil-drain-plug-inspection-and-rework/important-cases","documents":"/api/acts/ad-dauphin-14-main-rotor-gearbox-oil-drain-plug-inspection-and-rework/documents"}}