{"id":"F2006B04516","name":"AD/BELL 206/61 - Main Rotor Hub Yoke - Inspection and Rework","slug":"ad-bell-206-61-main-rotor-hub-yoke-inspection-and-rework","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114224,"registerId":"commonwealth-F2006B04516-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/61 - Main Rotor Hub Yoke - Inspection and Rework","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nBell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\nAD/BELL 206/61 Main Rotor Hub Yoke \\- Inspection and Rework 10/74\n\nApplicability: All model 206 fitted with main rotor hub yoke P/N 206-010-101-1, \\-5, \\-9 and \\-13. Document: Bell SB 206-04-1-74-1, Rev. A.\n\nNote: Agusta SB No. BT206-84 refers.\n\nCompliance: Part 1, Inspection: At each daily or overnight inspection.\n\nNote: For aircraft maintained in accordance with ANO 100.5.1 this Directive shall be entered on the maintenance release as maintenance required. The inspection may be performed by the pilot in command, in which case certification is not required. In all other cases certification may be made on the maintenance release. This inspection may also be performed and certified by any Licensed Aircraft Maintenance Engineer.\n\nPart II, Rework: Within 1200 hours time in service, or when next the main rotor hub is removed for any reason, or not later than 31 December 1974, whichever occurs first.\n\nBackground: AD/Agusta 206/49 equivalent.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive issued in 1974 addressing a specific manufacturing defect in a particular helicopter component. It has not expanded beyond its original scope; it remains precisely targeted at the identified safety issue with no evidence of scope creep or mission expansion."},"complexity_factors":["Single, specific mechanical component targeted (main rotor hub yoke)","Only 4 specific part numbers affected","Straightforward two-part compliance structure (inspection + rework)","Clear, unambiguous deadlines using 'whichever occurs first' logic","Minimal cross-referencing (only 2 service bulletins and one equivalent AD)","No defined terms section or interpretation provisions","Single page document with plain operational language"],"plain_english_summary":"This AD mandates daily preflight/after-overnight visual checks and a mandated rework of the main rotor hub yoke on Bell 206/Agusta Bell 206 helicopters fitted with certain yoke part numbers. Pilots or licensed maintenance engineers may perform the daily checks; the rework must occur within 1,200 flight hours, at next hub removal, or by 31 December 1974. It targets a potential yoke defect that could cause catastrophic main-rotor failure, ensuring continued airworthiness."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope is confined to the specified 206 models fitted with the listed hub yoke part numbers and prescribes inspection and rework requirements as set out. Nothing in the text indicates an expansion or contraction of that original applicability; it mirrors the equivalent Agusta AD referenced in the background."},"complexity_factors":["Narrow applicability: limited to Bell/Agusta Bell 206 helicopters fitted with four specific part numbers (P/N 206-010-101-1, -5, -9, -13).","Two-part compliance: recurring inspections at each daily/overnight check plus a one-off rework deadline (1,200 hours TIS, next hub removal, or specific calendar date).","Multiple compliance paths/certification regimes: pilot may perform inspection under ANO 100.5.1 without maintenance-release certification; otherwise licensed engineers or maintenance release certification required.","Cross-references to external service documents: requires following Bell SB 206-04-1-74-1 Rev. A and notes an Agusta service bulletin equivalent.","Operational impact timing: rework can be triggered by either hours-in-service, removal event, or an absolute calendar deadline, creating coordination and downtime considerations."],"plain_english_summary":"This airworthiness directive requires daily/overnight inspections of the main rotor hub yoke (P/Ns 206-010-101-1, -5, -9, -13) on Bell/Agusta Bell 206 helicopters and mandates a rework of that yoke within 1,200 flight hours, the next removal of the main rotor hub, or by 31 December 1974 (whichever is earlier), per Bell Service Bulletin 206-04-1-74-1 Rev. A. It affects owners, operators, pilots and maintenance engineers by creating a recurring inspection duty and a compulsory rework deadline, with inspection certification options under ANO 100.5.1."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-61-main-rotor-hub-yoke-inspection-and-rework","history":"/api/acts/ad-bell-206-61-main-rotor-hub-yoke-inspection-and-rework/history","analysis":"/api/acts/ad-bell-206-61-main-rotor-hub-yoke-inspection-and-rework/analysis","conflicts":"/api/acts/ad-bell-206-61-main-rotor-hub-yoke-inspection-and-rework/conflicts","importantCases":"/api/acts/ad-bell-206-61-main-rotor-hub-yoke-inspection-and-rework/important-cases","documents":"/api/acts/ad-bell-206-61-main-rotor-hub-yoke-inspection-and-rework/documents"}}