{"id":"F2006B08785","name":"AD/DAUPHIN/9 - Horizontal Stabiliser Attachment Flanges - Modification","slug":"ad-dauphin-9-horizontal-stabiliser-attachment-flanges-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52120,"registerId":"commonwealth-F2006B08785-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DAUPHIN/9 - Horizontal Stabiliser Attachment Flanges - Modification","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/9 Horizontal Stabiliser Attachment\n\nFlanges - Modification\n\n\n1/83\n\n \n\nApplicability: All model SA365 helicopters which have been modified in accordance with Dauphin SB No. 55.04 (8 setting of lateral fins).\n\n \n\nDocument: Dauphin SB No. 55.05.\n\n \n\nNote: DGAC AD 82-136-14(B) refers.\n\n \n\nCompliance: As detailed in the requirement document.\n\n \n\nBackground: Several cases of failure of the stabiliser attachment flanges have been reported in aircraft with the stabiliser setting.\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 airworthiness issue in a specific helicopter model. It has not expanded beyond its original purpose of mandating a structural modification to prevent stabiliser attachment failures."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined term implicitly referenced (SB 55.04)","No nested conditional logic — simple applicability test (has the helicopter been modified per SB 55.04?)","Single cross-reference to French aviation authority document (DGAC AD 82-136-14(B))","Compliance is delegated entirely to external document (Dauphin SB No. 55.05) — no detailed technical requirements in the instrument itself","No exceptions or exemptions stated"],"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 specific **Eurocopter Dauphin helicopters** (model SA365) that have had a particular modification installed (called \"SB 55.04\" which adjusts the lateral fins).\n\n**What it does:**\n- Requires owners/operators to carry out a further modification to the **horizontal stabiliser attachment flanges** (the metal parts that connect the tail's horizontal wing to the helicopter body).\n- This is required because the original modification (SB 55.04) has caused **structural failures** in the attachment flanges — essentially, they're cracking or breaking.\n\n**Who it affects:**\n- Operators of SA365 Dauphin helicopters that have the SB 55.04 modification installed.\n\n**Why it matters:**\n- **Flight safety.** If the horizontal stabiliser attachment fails, the pilot could lose control of the helicopter. This AD prevents accidents by mandating a fix before the part fails."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Based on the text provided, the AD addresses a specific safety problem by requiring the modification set out in Dauphin SB No. 55.05 for SA365 helicopters that already have the SB No. 55.04 lateral-fin setting. The instrument limits scope to that pre-modified subset and delegates technical requirements to the referenced service bulletin. The document contains no indication that the applicable population or the intended coverage has been broadened or narrowed from that stated purpose (Applicability; Document; Background)."},"complexity_factors":["Narrow applicability limited to SA365 helicopters modified per Dauphin SB No. 55.04, reducing breadth but requiring verification of prior modification (Applicability).","Technical and compliance detail is delegated to an external document (Dauphin SB No. 55.05), so readers must obtain and interpret that SB to know exact work and timing (Document; Compliance).","Reference to a foreign authority's AD (DGAC AD 82-136-14(B)) adds an external cross-check requirement (Note).","The AD text does not state compliance times, parts, or procedures directly, which creates administrative and operational steps (sourcing SB, parts, scheduling) for operators (Compliance).","Underlying safety issue (reported flange failures) requires technical modification rather than routine inspection, which may involve part replacement and workplace hours (Background)."],"plain_english_summary":"This AD requires owners of SA365 (Dauphin) helicopters that were previously modified per Dauphin SB No. 55.04 to carry out the modification to the horizontal stabiliser attachment flanges as detailed in Dauphin SB No. 55.05. It responds to reported flange failures, shifts technical detail and timing to the service bulletin, and places costs and scheduling on operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dauphin-9-horizontal-stabiliser-attachment-flanges-modification","history":"/api/acts/ad-dauphin-9-horizontal-stabiliser-attachment-flanges-modification/history","analysis":"/api/acts/ad-dauphin-9-horizontal-stabiliser-attachment-flanges-modification/analysis","conflicts":"/api/acts/ad-dauphin-9-horizontal-stabiliser-attachment-flanges-modification/conflicts","importantCases":"/api/acts/ad-dauphin-9-horizontal-stabiliser-attachment-flanges-modification/important-cases","documents":"/api/acts/ad-dauphin-9-horizontal-stabiliser-attachment-flanges-modification/documents"}}