{"id":"F2006B04530","name":"AD/BELL 206/78 - Freewheeling Outer Race Shaft - Inspection","slug":"ad-bell-206-78-freewheeling-outer-race-shaft-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114244,"registerId":"commonwealth-F2006B04530-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/78 - Freewheeling Outer Race Shaft - Inspection","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 206/78 Freewheeling Outer Race Shaft - Inspection 2/79\n\nApplicability: All models as detailed in Requirement Documents. Document:  1. Bell Alert SB No. 206-78-2; or\n\n2.    Bell Alert SB No. 206L-78-4; or\n\n \n\n3.    Agusta SB No. BT206-19. Compliance: As detailed in the requirement documents.\n\nBackground: Due to an incorrect manufacturing process, a number of freewheeling outer race shafts have exhibited intergranular cracking in the radii area forward of the engine drive splines. AD/Agusta 206/63 equivalent.\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1689},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow technical scope addressing the specific manufacturing defect in freewheeling outer race shafts for Bell 206 helicopters. No scope creep detected."},"complexity_factors":["Extremely brief instrument (under 200 words)","No defined terms or interpretation section","Single compliance pathway requiring adherence to external technical documents","No conditional provisions, exceptions, or nested logic"],"plain_english_summary":"This Airworthiness Directive (a legally binding safety order) mandates urgent inspections of a critical helicopter component — the **freewheeling outer race shaft** — on Bell 206 and Agusta Bell 206 series aircraft.\n\n**The guts of it:** A manufacturing cock-up means some shafts developed microscopic cracks (called *intergranular cracking*) where they connect to the engine. If these cracks spread, the shaft could fail, potentially leaving you without engine power mid-flight.\n\n**Who's caught by this:** Anyone operating Bell 206 helicopters, including the Agusta-licensed versions.\n\n**What you must do:** Follow the inspection procedures detailed in one of three technical bulletins (Bell Service Bulletin 206-78-2, Bell Service Bulletin 206L-78-4, or Agusta Service Bulletin BT206-19). These specify exactly how to check for the cracks and how often.\n\n**The bottom line:** This prevents your helicopter from dropping out of the sky due to a dodgy part. Inspect the shaft as directed or ground the aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-78-freewheeling-outer-race-shaft-inspection","history":"/api/acts/ad-bell-206-78-freewheeling-outer-race-shaft-inspection/history","analysis":"/api/acts/ad-bell-206-78-freewheeling-outer-race-shaft-inspection/analysis","conflicts":"/api/acts/ad-bell-206-78-freewheeling-outer-race-shaft-inspection/conflicts","importantCases":"/api/acts/ad-bell-206-78-freewheeling-outer-race-shaft-inspection/important-cases","documents":"/api/acts/ad-bell-206-78-freewheeling-outer-race-shaft-inspection/documents"}}