{"id":"F2009L00887","name":"AD/EMERAUDE/1 - Anti Spin Strakes - Installation - CANCELLED","slug":"ad-emeraude-1-anti-spin-strakes-installation-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78187,"registerId":"commonwealth-F2009L00887-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piel Emeraude Series Aeroplanes","sectionType":"division","heading":"Piel Emeraude Series Aeroplanes","content":"### Piel Emeraude Series Aeroplanes\n\n| AD/EMERAUDE/1 | Anti Spin Strakes - Installation | 4/2009 |\n| ------------- | -------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                          |\n| ------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 9 April 2009.                                                                                                                                                                                                                                               |\n| Background:  | This unique Australian AD was raised prior to 1963 requiring anti-spin strakes to be fitted following unsatisfactory spin recovery during flight test. Compliance was required forthwith.As all affected aircraft would have been modified long ago, this AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n26 February 2009","sortOrder":0},{"sectionNumber":"AD/EMERAUDE/1","sectionType":"part","heading":"AD/EMERAUDE/1","content":"## AD/EMERAUDE/1","sortOrder":1},{"sectionNumber":"Anti Spin Strakes - Installation","sectionType":"part","heading":"Anti Spin Strakes - Installation","content":"## Anti Spin Strakes - Installation","sortOrder":2},{"sectionNumber":"4/2009","sectionType":"part","heading":"4/2009","content":"## 4/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1659},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument narrows the regulatory burden by revoking an obsolete airworthiness directive. It does not expand the scope of regulation or impose new requirements; it simply removes a defunct rule concerning specific aircraft modifications."},"complexity_factors":["Single operative provision: cancellation of one prior instrument","No defined terms or interpretive provisions","No conditions, exceptions, or procedural steps","No cross-references to other legislative instruments (other than the implicitly cancelled AD)","Background explanation provided for context only"],"plain_english_summary":"This document **cancels an obsolete aircraft safety rule** that required anti-spin strakes to be fitted to Piel Emeraude series aeroplanes.\n\n**What the old rule did:**\nThe original directive (issued before 1963) required owners to install 'anti-spin strakes' — small aerodynamic fins that improve spin recovery — on these light aircraft. This followed flight tests that revealed dangerous spinning characteristics.\n\n**Why it's cancelled:**\nThe Civil Aviation Safety Authority (CASA) has cancelled this directive because all affected aircraft were modified to comply decades ago. The requirement is now redundant.\n\n**What this means:**\nOwners of Piel Emeraude aircraft no longer need to refer to this specific directive. The strakes should already be installed on any aircraft that needed them. No further action is required under this instrument."}},"importantCases":[],"_links":{"self":"/api/acts/ad-emeraude-1-anti-spin-strakes-installation-cancelled","history":"/api/acts/ad-emeraude-1-anti-spin-strakes-installation-cancelled/history","analysis":"/api/acts/ad-emeraude-1-anti-spin-strakes-installation-cancelled/analysis","conflicts":"/api/acts/ad-emeraude-1-anti-spin-strakes-installation-cancelled/conflicts","importantCases":"/api/acts/ad-emeraude-1-anti-spin-strakes-installation-cancelled/important-cases","documents":"/api/acts/ad-emeraude-1-anti-spin-strakes-installation-cancelled/documents"}}