{"id":"F2006B08755","name":"AD/DAUPHIN/44 - Tail Rotor Hub Fairing","slug":"ad-dauphin-44-tail-rotor-hub-fairing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52023,"registerId":"commonwealth-F2006B08755-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DAUPHIN/44 - Tail Rotor Hub Fairing","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/44 Tail Rotor Hub Fairing  9/95 TX\n\n \n\nApplicability: Model SA 365C, C1, C2, and C3, and 365N.\n\n \n\nRequirement: Action in accordance with Eurocopter Telex Service No. 01.34 or 01.43 as applicable.\n\n \n\nNote: DGAC ADs 95-112-040(B) and 95-107-039(B) R1 refer.\n\n \n\nCompliance: Prior to further flight after 7 July 1995, thereafter in accordance with the Requirement Document.\n\n \n\nBackground: There have been in service reports of ruptured springs, which both DGAC and Eurocopter consider to be an urgent airworthiness matter.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific mechanical defect in specific helicopter models. It has not expanded beyond its original purpose of mandating inspection/repair of tail rotor hub fairing springs."},"complexity_factors":["Very short document (under 200 words)","Only 4 defined elements: applicability (5 models), requirement (2 telex references), compliance deadline, and background","No nested conditional logic or cross-references to other legislation","Single straightforward obligation: follow manufacturer's telex instructions","No exceptions, exemptions, or alternative compliance methods specified"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific Eurocopter Dauphin helicopters.\n\n**Who it affects:** Owners and operators of Eurocopter SA 360 and SA 365 series helicopters, specifically models SA 365C, C1, C2, C3, and 365N.\n\n**What it requires:** Operators must inspect or repair the tail rotor hub fairing (a protective cover over the tail rotor assembly) following instructions in Eurocopter Telex Service documents 01.34 or 01.43, depending on which applies to their aircraft.\n\n**Why it matters:** Springs in the tail rotor hub fairing have been rupturing in service. Both the French aviation authority (DGAC) and the manufacturer (Eurocopter) consider this an urgent safety risk that could affect flight safety.\n\n**When compliance is required:** Before any further flight after 7 July 1995, and ongoing compliance with the manufacturer's instructions thereafter."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD enforces corrective and follow-up actions for the specified Dauphin models in response to reports of ruptured springs. It does not expand applicability beyond the listed models or add requirements beyond those referenced in the Eurocopter telex and related DGAC ADs. The directive imposes an immediate compliance deadline and ongoing obligations consistent with the stated safety purpose (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Narrow applicability limited to specific Eurocopter Dauphin models (Applicability)","Immediate compliance deadline prior to next flight after a specified date (Compliance)","Technical content delegated to external documents (Eurocopter Telex Service No. 01.34 / 01.43), requiring cross-reference (Requirement)","Ongoing compliance obligations referenced but not fully described in the AD (Compliance; Requirement)","Dependence on availability of parts, skilled labour and interpretation of telex increases operational risk (Requirement)"],"plain_english_summary":"### What this instrument does (mechanical change)\n\nThis Airworthiness Directive (AD) requires operators of certain Eurocopter Dauphin helicopters to carry out the corrective and follow-up actions set out in Eurocopter Telex Service No. 01.34 or No. 01.43, as applicable (Requirement). The AD applies to Model SA 365C, C1, C2, C3 and 365N helicopters (Applicability). Operators must complete the initial action before the next flight after 7 July 1995 and must continue to comply with the telex-specified inspections or procedures thereafter (Compliance).\n\n### Who it affects\n\n- Aircraft owners and operators of the listed Dauphin models (Applicability).  \n- Maintenance organisations and engineers who perform the telex-prescribed work (Requirement).\n\n### Why it matters (stated reason and practical implications)\n\nThe stated reason is that there have been in-service reports of ruptured springs associated with the tail rotor hub fairing, which the French Directorate General for Civil Aviation (DGAC) and Eurocopter have identified as an urgent airworthiness matter (Background). The AD implements Eurocopter’s telex instructions immediately to address that safety concern (Requirement, Compliance). The AD also references related DGAC ADs (Note).\n\n### Costs, incentives, and trade-offs (practical testing of the stated purpose)\n\n- Who pays: the operators/owners pay for inspection, parts, labour and any downtime caused by complying with the telex instructions (Requirement; Compliance).  \n- Who decides: the AD prescribes mandatory compliance; Eurocopter’s telex documents set the technical steps (Requirement). Scheduling and execution decisions (when and how to carry out the work within the AD’s timing requirement) rest with the operator and the maintenance organisation, subject to the AD’s deadlines (Compliance; Requirement).  \n- Compliance burden: immediate—aircraft must not fly until the initial action is completed after 7 July 1995, creating potential grounding and scheduling costs (Compliance). Ongoing obligations follow the Requirement Document, which may impose recurring inspections or maintenance actions (Compliance; Requirement).  \n- Implementation risk: effective compliance depends on timely access to the correct parts, clear interpretation of the Eurocopter telex, and availability of qualified maintenance capacity. If parts or skilled labour are constrained, operators may face delayed return-to-service (Requirement).  \n- Effects on private choice and operations: operators must choose between grounding aircraft to comply or arranging expedited maintenance; they may reassign tasks, lease replacements or reduce flying until compliance is achieved. The AD restricts operational freedom for the affected airframes until compliance is achieved (Compliance).  \n- Concentration of costs and benefits: costs (repairs, downtime) fall directly on the relatively small set of operators of the specified Dauphin models; the safety benefit is concentrated on those operators and any users of those aircraft (Applicability; Background).  \n\n### Practical mechanics and risk-control features\n\n- The AD does not itself detail the technical fix; it mandates that the operator follow the relevant Eurocopter Telex Service (Requirement).  \n- It imposes an immediate action deadline (prior to further flight after 7 July 1995) and then ongoing compliance per the Requirement Document (Compliance).  \n- It cross-references DGAC ADs for related information (Note).\n\n(References in parentheses: Applicability, Requirement, Note, Compliance, Background.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-dauphin-44-tail-rotor-hub-fairing","history":"/api/acts/ad-dauphin-44-tail-rotor-hub-fairing/history","analysis":"/api/acts/ad-dauphin-44-tail-rotor-hub-fairing/analysis","conflicts":"/api/acts/ad-dauphin-44-tail-rotor-hub-fairing/conflicts","importantCases":"/api/acts/ad-dauphin-44-tail-rotor-hub-fairing/important-cases","documents":"/api/acts/ad-dauphin-44-tail-rotor-hub-fairing/documents"}}