{"id":"F2006B08748","name":"AD/DAUPHIN/37 - Tripod","slug":"ad-dauphin-37-tripod","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52009,"registerId":"commonwealth-F2006B08748-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DAUPHIN/37 - Tripod","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/37 Tripod 5/94\n\nApplicability: Model SA 365 N helicopters equipped with tripod part number 360A23-0024-09. Requirement:               Action in accordance with Eurocopter Telex Service Bulletin 01.28b.\n\nNote: DGAC AD 88-188-024(B)R1 refers.\n\n \n\nCompliance: Unless already accomplished, as specified in the Requirement Document.\n\n \n\nBackground: A crack was found at the root of one of the three arms on the tripod ring. An investigation revealed that the crack originated at a corrosion site.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft part. It has not expanded beyond its original purpose of mandating inspection/repair of the corroded tripod component."},"complexity_factors":["Single, specific applicability criterion (one helicopter model with one specific part number)","Single requirement referencing an external document (Eurocopter Service Bulletin)","No defined terms section","No nested conditional logic or exceptions","Minimal cross-referencing (only one reference to a French aviation authority document)","Extremely short document (approximately 150 words of substantive content)","Clear, unambiguous compliance deadline ('Unless already accomplished')"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific helicopters.\n\n**What it does:**\n- Requires owners/operators of certain **Eurocopter Dauphin helicopters** (model SA 365 N with a specific tripod part) to take corrective action.\n- The action involves following a **Eurocopter Service Bulletin** (a manufacturer's technical instruction) to address a safety defect.\n\n**Why it matters:**\n- A **crack was discovered** in the tripod ring (a structural component) caused by **corrosion**.\n- If left unaddressed, this crack could lead to **structural failure** — potentially catastrophic in a helicopter.\n\n**Who it affects:**\n- Operators of SA 365 N Dauphin helicopters with tripod part number **360A23-0024-09**.\n- These are typically used for emergency services, offshore oil transport, or corporate transport.\n\n**What must be done:**\n- Follow the manufacturer's Service Bulletin **01.28b**.\n- Compliance is required unless the fix has already been done.\n\n**Key point:** This is **not optional** — it's a legal requirement under the Civil Aviation Regulations. Flying without complying could ground the aircraft or expose the operator to penalties."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD does not broaden or narrow regulatory coverage beyond imposing a mandatory corrective action on a clearly defined set of helicopters and a specific component. It targets post-discovery corrective work for the specified tripod part and relies on the manufacturer’s service bulletin for technical implementation, rather than changing the wider scope of regulation. (Applicability; Requirement; Background)"},"complexity_factors":["Narrow, specific applicability (only Model SA 365 N helicopters fitted with tripod P/N 360A23-0024-09) (Applicability)","Reliance on an external technical document (Eurocopter Telex Service Bulletin 01.28b) for the required corrective action rather than reproducing steps in the AD (Requirement)","Compliance phrased as contingent (‘Unless already accomplished, as specified in the Requirement Document’), requiring operators to establish prior-compliance status and to document actions (Compliance)","Technical nature of the defect (crack originating from corrosion) requires inspection and possible repair/replacement by qualified maintenance personnel, creating operational disruption and resource costs (Background; Requirement)","Reference to another authority’s AD (DGAC AD 88-188-024(B)R1) adds cross-jurisdictional documentation to consider (Note)"],"plain_english_summary":"What this instrument does (mechanically)\n\n- This is an Airworthiness Directive (AD) that makes a specific maintenance action mandatory for a defined set of helicopters. (Applicability; Requirement)\n- It requires operators of Eurocopter Model SA 365 N helicopters fitted with tripod part number 360A23-0024-09 to carry out the action described in Eurocopter Telex Service Bulletin 01.28b. The AD does not reproduce the technical steps; it directs operators to follow that manufacturer service document. (Applicability; Requirement; Compliance)\n\nWho it affects\n\n- Owners and operators of Eurocopter SA 365 N helicopters that have the tripod identified by part number 360A23-0024-09. (Applicability)\n- Maintenance organisations and personnel who will perform the inspection/repair/replacement work required by the referenced service bulletin. (Requirement)\n\nWhy it matters (official rationale and mechanical effect)\n\n- The AD follows the discovery of a crack at the root of one of the three arms on the tripod ring; the crack originated at a corrosion site. The stated purpose of the AD is to address that defect by mandating the manufacturer’s corrective action. (Background; Requirement)\n\nPractical consequences, incentives and trade-offs\n\n- Who pays: The operator/owner is required to comply, so they will incur the direct costs of any inspections, repairs or part replacements directed by the Eurocopter Telex. (Requirement; Compliance)\n- Who decides and how: The Civil Aviation Safety Authority issued the AD and prescribes that the corrective action be implemented in accordance with the manufacturer’s Telex Service Bulletin 01.28b. The AD itself does not specify the technical steps. That places decision-making about the precise technical method on the service bulletin’s instructions and the persons who apply them. (Requirement)\n- Compliance burden: Because the AD points to an external manufacturer service bulletin rather than setting out steps in the AD text, operators must obtain that bulletin and follow its instructions. This creates administrative requirements (sourcing and documenting compliance) and operational ones (scheduling inspections/repairs). (Requirement; Compliance)\n- Implementation risk and opportunity costs: The AD targets a specific structural component (the tripod ring arm). Implementing the Telex may require inspection downtime, possible part replacement, and skilled maintenance input. Those are time and resource costs for the operator; the AD does not describe how long or how disruptive the work will be. (Requirement; Background)\n- Effects on private enterprise and competition: The AD mandates safety-compliant action but does not limit who may carry out the work. Independent maintenance providers that can comply with the Telex are able to perform the work; the AD’s mechanical effect is to create demand for the corrective action among affected operators. (Requirement)\n\nImplementation and enforcement notes\n\n- Compliance is stated as: “Unless already accomplished, as specified in the Requirement Document.” The AD therefore imposes a mandatory deadline or action pathway as set out in the referenced Telex; the AD itself does not set alternative options or exemptions. (Compliance)\n- A related French DGAC airworthiness directive (DGAC AD 88-188-024(B)R1) is referenced for information. The AD relies on the manufacturer’s telex for the corrective steps. (Note; Requirement)\n\nConcise summary\n\n- The AD compels operators of SA 365 N helicopters with tripod P/N 360A23-0024-09 to carry out the corrective action in Eurocopter Telex Service Bulletin 01.28b because a crack originating from corrosion was found at the tripod ring arm root. Operators bear the cost and responsibility to obtain and implement the Telex’s instructions and to demonstrate compliance. (Applicability; Requirement; Background; Compliance)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-dauphin-37-tripod","history":"/api/acts/ad-dauphin-37-tripod/history","analysis":"/api/acts/ad-dauphin-37-tripod/analysis","conflicts":"/api/acts/ad-dauphin-37-tripod/conflicts","importantCases":"/api/acts/ad-dauphin-37-tripod/important-cases","documents":"/api/acts/ad-dauphin-37-tripod/documents"}}