{"id":"F2006L03396","name":"AD/BELL 206/164 - Vertical Fin Supports - Inspection","slug":"ad-bell-206-164-vertical-fin-supports-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":60832,"registerId":"commonwealth-F2006L03396-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron Canada (BHTC) 20","sectionType":"division","heading":"Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters","content":"### Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\n| AD/BELL 206/164 | Vertical Fin Supports - Inspection | 11/2006 |\n| --------------- | ---------------------------------- | ------- |\n\n| Applicability: | Agusta model AB206A and AB206B helicopters equipped with vertical fin supports Part Number 206-031-417-3/-7 or 206-031-418-1/-5.                                                                                                             |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Inspect the vertical fin supports Part Number 206-031-417-3/-7 or 206-031-418-1/-5 (depending on the components installed) in accordance with the instructions contained in Agusta Bolletino Tecnico 206-240.Note: EASA AD 2006-0275 refers. |\n| Compliance:    | At or before the next scheduled 100 hourly inspection or annual inspection (whichever first), but no later than 3 months from the effective date of this AD.                                                                                 |\n|                | This Airworthiness Directive becomes effective on 26 October 2006.                                                                                                                                                                           |\n| Background:    | There has been a report of an in flight separation of the vertical fin due to the failure of the fin supports. The preliminary analysis revealed that the failure (cracking) originated at the fin support attachment bolt holes.            |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n14 September 2006","sortOrder":0},{"sectionNumber":"AD/BELL 206/164","sectionType":"part","heading":"AD/BELL 206/164","content":"## AD/BELL 206/164","sortOrder":1},{"sectionNumber":"Vertical Fin Supports - Inspection","sectionType":"part","heading":"Vertical Fin Supports - Inspection","content":"## Vertical Fin Supports - Inspection","sortOrder":2},{"sectionNumber":"11/2006","sectionType":"part","heading":"11/2006","content":"## 11/2006","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive addressing a specific safety-critical defect in defined aircraft models. The scope remains precisely limited to the identified structural failure mode and affected part numbers, consistent with the original purpose of preventing in-flight separation of the vertical fin."},"complexity_factors":["Single, specific mechanical component targeted (vertical fin supports)","Only 4 specific part numbers affected","Straightforward compliance timeline: next 100-hour/annual inspection or 3 months","Single reference document for inspection procedure (Agusta Bolletino Tecnico 206-240)","No nested exceptions, conditional logic, or extensive cross-referencing","Clear applicability criteria limited to two helicopter models","Background explanation is concise and directly relates to the requirement"],"plain_english_summary":"This AD mandates inspection of the vertical fin supports on Agusta AB206A/AB206B helicopters that have parts 206-031-417-3, 206-031-417-7, 206-031-418-1 or 206-031-418-5 installed, after reported in‑flight fin separation due to cracking around bolt holes.  \n\nInspections must follow Agusta Bolletino Tecnico 206‑240 before the next maintenance check or within three months, and compliance is legally mandatory under Australian aviation law."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope remains focused on inspecting the specified vertical fin supports on particular Agusta/Bell 206 helicopters. The AD mandates inspection timing and a referenced service bulletin but does not expand to other models, parts, or mandatory modifications."},"complexity_factors":["Narrow applicability: only Agusta AB206A/AB206B models with specific part numbers are affected (Applicability).","Clear but time‑bound compliance window: next 100‑hour or annual inspection, or within 3 months (Compliance).","Requires operators to obtain and follow an external service bulletin (Agusta Bolletino Tecnico 206‑240) for inspection procedure (Requirement).","Safety‑critical context (in‑flight separation reported) increases operational urgency and potential downtime (Background).","Directive mandates inspection only; repair/remedy procedures and costs fall to operators and may require additional work beyond the AD text."],"plain_english_summary":"This Airworthiness Directive requires operators of Agusta/Bell 206 helicopters fitted with specified vertical fin supports (PN 206-031-417-3/-7 or 206-031-418-1/-5) to inspect those supports according to Agusta Bolletino Tecnico 206-240. Inspections must be done at the next scheduled 100‑hour or annual check, or within 3 months; operators pay for inspections and repairs. The AD responds to a reported in‑flight fin separation caused by cracking at the fin support attachment bolt holes. (Applicability; Requirement; Compliance; Background)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-164-vertical-fin-supports-inspection","history":"/api/acts/ad-bell-206-164-vertical-fin-supports-inspection/history","analysis":"/api/acts/ad-bell-206-164-vertical-fin-supports-inspection/analysis","conflicts":"/api/acts/ad-bell-206-164-vertical-fin-supports-inspection/conflicts","importantCases":"/api/acts/ad-bell-206-164-vertical-fin-supports-inspection/important-cases","documents":"/api/acts/ad-bell-206-164-vertical-fin-supports-inspection/documents"}}