{"id":"F2006B04355","name":"AD/BELL 205/10 - 205A/A1 Tail Boom Vertical Fin Forward - Inspection and Modification","slug":"ad-bell-205-10-205a-a1-tail-boom-vertical-fin-forward-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44169,"registerId":"commonwealth-F2006B04355-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 205/10 - 205A/A1 Tail Boom Vertical Fin Forward - Inspection and 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 5/1971,Rotorcraft,Bell Helicopter Textron 205 Series Helicopters,205A/A1 Tail Boom Vertical Fin Forward - Inspection and Modification,10\ntitle: Airworthiness Directive - AD/BELL 205/10 - 205A/A1 Tail Boom Vertical Fin Forward - Inspection and 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)  Bell Helicopter Textron 205 Series Helicopters\n\n \n\n# AD/BELL 205/10 205A/A1 Tail Boom Vertical Fin\n\nForward - Inspection and Modification\n\n# 5/71\n\nApplicability: All 205A and 205A-1 models.\n\nDocument:  Bell SB No. 205A-6.\n\nCompliance: For Part 1 of compliance document - at each daily or overnight inspection. For Part 2 of compliance document - within 100 hours time in service after 2 May 1971.\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\n \n\n \n\n \n\n \n\nFederal Register of Legislative Instruments F2006B04355\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on tail boom vertical fin inspections and modifications for two specific helicopter models. It has not expanded beyond its original technical safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words of substantive content)","Only 2 defined compliance actions (Part 1 inspection and Part 2 modification)","Single applicability criterion (205A and 205A-1 models)","No cross-references to other legislation beyond generic 'Civil Aviation Regulations 1998, Part 39'","No conditional logic, exceptions, or nested provisions","Clear, unambiguous deadlines (daily/overnight and 100 hours TIS)","Simple binary structure: inspection requirement + modification requirement"],"plain_english_summary":"This CASA Airworthiness Directive mandates urgent safety action for Bell 205A and 205A‑1 helicopters: daily/overnight inspections of the tail‑boom vertical fin forward section and a required modification (per Bell Service Bulletin 205A‑6) within the specified compliance window. It affects owners, operators and maintenance engineers; compliance is mandatory to address a structural concern and avoid grounding or legal penalties."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The document does not indicate any change in scope; applicability is stated as 'All 205A and 205A‑1 models' and the compliance requirements are set out (inspection frequency and a 100‑hour modification deadline referencing Bell SB No. 205A‑6)."},"complexity_factors":["Narrow applicability: limited to Bell 205A and 205A‑1 models (reduces complexity).","Two-part compliance regime: Part 1 requires recurring checks at daily/overnight inspections, Part 2 requires a modification within a fixed hours limit (requires operators to track different obligations).","External reference: substantive inspection/modification instructions are in Bell SB No. 205A‑6, so the AD requires consulting another document for technical steps.","Time-metric and historical date: compliance measured in 'hours time in service' with a baseline date (2 May 1971), which requires operators to compute time-in-service accurately.","Limited procedural detail in the AD itself: the AD sets obligations but relies on the service bulletin for implementation specifics (creates administrative follow-up)."],"plain_english_summary":"This Airworthiness Directive requires operators of Bell Helicopter Textron 205A and 205A‑1 helicopters to inspect the forward tail‑boom vertical fin at each daily or overnight inspection and to carry out the specified modification within 100 hours time in service after 2 May 1971, as described in Bell SB No. 205A‑6. The Civil Aviation Safety Authority issues the requirement; compliance actions and the associated costs are the responsibility of the aircraft owners/operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-205-10-205a-a1-tail-boom-vertical-fin-forward-inspection-and-modification","history":"/api/acts/ad-bell-205-10-205a-a1-tail-boom-vertical-fin-forward-inspection-and-modification/history","analysis":"/api/acts/ad-bell-205-10-205a-a1-tail-boom-vertical-fin-forward-inspection-and-modification/analysis","conflicts":"/api/acts/ad-bell-205-10-205a-a1-tail-boom-vertical-fin-forward-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-bell-205-10-205a-a1-tail-boom-vertical-fin-forward-inspection-and-modification/important-cases","documents":"/api/acts/ad-bell-205-10-205a-a1-tail-boom-vertical-fin-forward-inspection-and-modification/documents"}}