{"id":"F2008L02913","name":"AD/AC-SNOW/2 - Agricultural Equipment Boom Support - Modification - CANCELLED","slug":"ad-ac-snow-2-agricultural-equipment-boom-support-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74829,"registerId":"commonwealth-F2008L02913-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Ayres Thrush (Snow) Commander Series Aer","sectionType":"division","heading":"Ayres Thrush (Snow) Commander Series Aeroplanes","content":"### Ayres Thrush (Snow) Commander Series Aeroplanes\n\n| AD/AC-SNOW/2 | Agricultural EquipmentBoom Support - Modification | 9/2008 |\n| ------------ | ------------------------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                           |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n|              | This AD is cancelled on 28 August 2008.                                                                                                                                                                                                                                              |\n| Background:  | This unique Australian AD, raised in 1966 against Aero Commander Service Letter (SL) No. 41, required a modification to provide additional boom support. Compliance was required forthwith. As all affected aircraft would have been modified by now, this AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n18 July 2008","sortOrder":0},{"sectionNumber":"AD/AC-SNOW/2","sectionType":"part","heading":"AD/AC-SNOW/2","content":"## AD/AC-SNOW/2","sortOrder":1},{"sectionNumber":"Agricultural EquipmentBoom Support - Mod","sectionType":"part","heading":"Agricultural EquipmentBoom Support - Modification","content":"## Agricultural Equipment  \nBoom Support - Modification","sortOrder":2},{"sectionNumber":"9/2008","sectionType":"part","heading":"9/2008","content":"## 9/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1619},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates the original airworthiness directive rather than expanding its scope. The 1966 requirement has been fully satisfied across the fleet, so the directive is formally cancelled without adding new obligations or extending coverage to new aircraft types."},"complexity_factors":["Single operative provision consisting of one word: 'CANCELLED'","No defined terms, conditions, or exceptions","No cross-references to other legislation","Document serves purely as a historical sunset notice"],"plain_english_summary":"This document **cancels an old aircraft safety rule** that required specific agricultural planes to be modified.\n\n**What it was:**\nSince 1966, owners of **Ayres Thrush (Snow) Commander series aeroplanes** had to strengthen the support structure for their agricultural spray booms (the long arms that extend from the wings to spread chemicals or seeds).\n\n**What changed:**\nAs of 28 August 2008, this requirement is **cancelled**. All affected aircraft have already been modified over the past 40+ years, so the rule is no longer needed. Aircraft owners do not need to take any further action."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-snow-2-agricultural-equipment-boom-support-modification-cancelled","history":"/api/acts/ad-ac-snow-2-agricultural-equipment-boom-support-modification-cancelled/history","analysis":"/api/acts/ad-ac-snow-2-agricultural-equipment-boom-support-modification-cancelled/analysis","conflicts":"/api/acts/ad-ac-snow-2-agricultural-equipment-boom-support-modification-cancelled/conflicts","importantCases":"/api/acts/ad-ac-snow-2-agricultural-equipment-boom-support-modification-cancelled/important-cases","documents":"/api/acts/ad-ac-snow-2-agricultural-equipment-boom-support-modification-cancelled/documents"}}