{"id":"F2009L03057","name":"AD/DAUPHIN/2 - Tail Fin Ballast Weight - Installation - CANCELLED","slug":"ad-dauphin-2-tail-fin-ballast-weight-installation-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":80653,"registerId":"commonwealth-F2009L03057-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter SA 360 and SA 365 (Dauphin) S","sectionType":"division","heading":"Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters","content":"### Eurocopter SA 360 and SA 365 (Dauphin) Series Helicopters\n\n| AD/DAUPHIN/2 | Tail Fin Ballast Weight - Installation | 9/2009 |\n| ------------ | -------------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                   |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n|              | This AD is cancelled on 27 August 2009.                                                                                                                                                                      |\n| Background:  | This unique Australian AD specified installation of ballast weight on the tail fin in accordance with SB No. 53.04 before issue of an Australian certificate of airworthiness. The AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n15 July 2009","sortOrder":0},{"sectionNumber":"AD/DAUPHIN/2","sectionType":"part","heading":"AD/DAUPHIN/2","content":"## AD/DAUPHIN/2","sortOrder":1},{"sectionNumber":"Tail Fin Ballast Weight - Installation","sectionType":"part","heading":"Tail Fin Ballast Weight - Installation","content":"## Tail Fin Ballast Weight - Installation","sortOrder":2},{"sectionNumber":"9/2009","sectionType":"part","heading":"9/2009","content":"## 9/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2156},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates the previous airworthiness directive entirely. It does not expand coverage to new aircraft types, introduce new requirements, or extend regulatory reach. The scope has narrowed (from active mandate to cancellation) rather than grown beyond the original purpose."},"complexity_factors":["Single operative provision cancelling previous requirements","No defined terms or interpretation sections","No conditional logic, exceptions, or procedural steps","Approximately 80 words of substantive content","Only external reference is to a withdrawn service bulletin (SB No. 53.04)"],"plain_english_summary":"**What this is:** A cancellation notice for a previous aircraft safety rule affecting Eurocopter Dauphin helicopters (models SA 360 and SA 365).\n\n**What it used to require:**\nPreviously, owners of these helicopters had to install a **ballast weight** (a heavy counterweight) on the tail fin before the aircraft could receive an Australian **certificate of airworthiness** (the official document proving an aircraft is safe to fly).\n\n**What changed:**\nAs of **27 August 2009**, this requirement is **cancelled**. Owners no longer need to install this specific ballast weight to legally operate these helicopters in Australia.\n\n**Why it matters:**\nThis removes a unique Australian-specific modification that was previously mandatory. The Civil Aviation Safety Authority (CASA) determined the ballast weight is no longer necessary for safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dauphin-2-tail-fin-ballast-weight-installation-cancelled","history":"/api/acts/ad-dauphin-2-tail-fin-ballast-weight-installation-cancelled/history","analysis":"/api/acts/ad-dauphin-2-tail-fin-ballast-weight-installation-cancelled/analysis","conflicts":"/api/acts/ad-dauphin-2-tail-fin-ballast-weight-installation-cancelled/conflicts","importantCases":"/api/acts/ad-dauphin-2-tail-fin-ballast-weight-installation-cancelled/important-cases","documents":"/api/acts/ad-dauphin-2-tail-fin-ballast-weight-installation-cancelled/documents"}}