{"id":"F2006B04513","name":"AD/BELL 206/58 - Full Cell Cavity and Vent Line Modification","slug":"ad-bell-206-58-full-cell-cavity-and-vent-line-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114218,"registerId":"commonwealth-F2006B04513-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/58 - Full Cell Cavity and Vent Line Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\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\nBell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\n \n\nAD/BELL 206/58 Full Cell Cavity and Vent Line Modification 5/74\n\nApplicability: Models 206B and AB206B with S/Nos. referenced in requirement documents. Document:               Bell SB No. 206-10-74-1 and -2, or Agusta SB No. BT206-76.\n\nCompliance: Within 100 hours time in service after 31 May 1974. Background: AD/Agusta 206/45 equivalent.\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1063},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow scope. It was issued in 1974 to address a specific fuel system safety concern in designated helicopter serial numbers and has not expanded beyond that original technical purpose."},"complexity_factors":["Limited applicability to only two specific helicopter models (206B and AB206B)","Single, specific modification requirement (fuel cell and vent line)","Simple compliance metric (100 hours time-in-service after fixed date)","Minimal cross-referencing (only references manufacturer service bulletins)","No nested conditions or exceptions"],"plain_english_summary":"This is a safety directive requiring owners of specific Bell helicopters to modify the fuel tank (full cell cavity) and ventilation lines to prevent potential safety hazards.\n\n**Who it affects:**\n- Owners and operators of Bell 206B and Agusta-Bell AB206B helicopters with specific serial numbers (listed in the referenced manufacturer documents)\n\n**What you must do:**\n- Carry out modifications to the fuel cell cavity and vent lines as specified in Bell Service Bulletin No. 206-10-74-1 and -2, or Agusta Service Bulletin No. BT206-76\n- Complete the work within 100 hours of flight time after 31 May 1974\n\n**Why it matters:**\nThis directive addresses safety issues with the fuel system that could lead to fuel leaks or ventilation problems, potentially causing fire hazards or engine failure. The modification ensures the helicopters meet current airworthiness standards."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-58-full-cell-cavity-and-vent-line-modification","history":"/api/acts/ad-bell-206-58-full-cell-cavity-and-vent-line-modification/history","analysis":"/api/acts/ad-bell-206-58-full-cell-cavity-and-vent-line-modification/analysis","conflicts":"/api/acts/ad-bell-206-58-full-cell-cavity-and-vent-line-modification/conflicts","importantCases":"/api/acts/ad-bell-206-58-full-cell-cavity-and-vent-line-modification/important-cases","documents":"/api/acts/ad-bell-206-58-full-cell-cavity-and-vent-line-modification/documents"}}