{"id":"F2006B02210","name":"AD/AC-SNOW/2 - Agricultural Equipment Boom Support - Modification","slug":"ad-ac-snow-2-agricultural-equipment-boom-support-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41440,"registerId":"commonwealth-F2006B02210-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC-SNOW/2 - Agricultural Equipment Boom Support - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 8/1966,Aircraft below 5700 kg,Ayres Thrush (Snow) Commander Series Aeroplanes,Agricultural Equipment Boom Support - Modification,2\ntitle: Airworthiness Directive - AD/AC-SNOW/2 - Agricultural Equipment Boom Support - Modification\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)  Ayres Thrush (Snow) Commander Series Aeroplanes\n\n \n\nAD/AC-SNOW/2 Agricultural Equipment Boom Support - Modification\n\nApplicability: Model S-2C and S-2D S/Nos. 1254 to 1349. Document:  Aero Commander - Olney Division SL No. 41. Compliance:               Forthwith.\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\n8/66\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1695},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This remains a targeted mechanical safety directive focused solely on the boom support modification for specific Ayres Thrush aircraft models, consistent with its original 1966 issuance purpose."},"complexity_factors":["Extremely brief text (under 50 words of operative content)","Limited applicability restricted to two specific aircraft models and defined serial number range","Single external technical reference (Service Letter No. 41) without reproduced details","No defined terms, exceptions, or conditional provisions","Immediate compliance requirement with no alternative methods or grace periods"],"plain_english_summary":"This Airworthiness Directive mandates an **immediate safety fix** for specific crop-dusting aircraft.\n\n**What it does:**\nOwners of Ayres Thrush (Snow) Commander S-2C and S-2D aircraft (serial numbers 1254–1349) must modify the support structure for their agricultural spray booms. The boom is the long horizontal arm that extends from the plane to spray crops over fields.\n\n**Who is affected:**\nOperators of these specific agricultural aircraft within the defined serial number range.\n\n**What must happen:**\nThe modification must be carried out **immediately** (\"forthwith\") using the technical instructions in **Aero Commander Service Letter No. 41**.\n\n**Why it matters:**\nThe directive addresses potential structural weakness in the boom support that could cause equipment failure or affect flight safety during low-level agricultural operations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-snow-2-agricultural-equipment-boom-support-modification","history":"/api/acts/ad-ac-snow-2-agricultural-equipment-boom-support-modification/history","analysis":"/api/acts/ad-ac-snow-2-agricultural-equipment-boom-support-modification/analysis","conflicts":"/api/acts/ad-ac-snow-2-agricultural-equipment-boom-support-modification/conflicts","importantCases":"/api/acts/ad-ac-snow-2-agricultural-equipment-boom-support-modification/important-cases","documents":"/api/acts/ad-ac-snow-2-agricultural-equipment-boom-support-modification/documents"}}