{"id":"F2006B04519","name":"AD/BELL 206/66 - Tail Rotor Control Tube - Inspection","slug":"ad-bell-206-66-tail-rotor-control-tube-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114227,"registerId":"commonwealth-F2006B04519-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/66 - Tail Rotor Control Tube - 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 206/66 Tail Rotor Control Tube - Inspection 4/75\n\nApplicability: Models 206A, 206B, AB206A and AB206B with S/Nos. referenced in requirement documents.\n\n \n\nDocument: Bell SB 206-75-2, or Agusta SB No. BT206-94. Compliance:  Within 100 hours time in service after 30 April 1975. Background:               AD/Agusta 206/52 equivalent.\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive focused on a specific mechanical component. It has not expanded beyond its original purpose of mandating a one-time inspection for a known safety issue."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 defined models in applicability section","Single compliance requirement with clear deadline (100 hours after fixed date)","No nested exceptions or conditional logic","References only 2 external technical documents (service bulletins)","No cross-references to other legislation sections","Straightforward imperative language ('Compliance: Within...')"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Bell and Agusta-Bell helicopter models to inspect the **tail rotor control tube** (a critical component that helps steer the helicopter) for defects.\n\n**Who it affects:**\n- Owners and operators of Bell 206A, 206B, AB206A and AB206B helicopters with specific serial numbers listed in the referenced service bulletins.\n\n**What must be done:**\n- Inspect the tail rotor control tube following the procedures in **Bell Service Bulletin 206-75-2** or **Agusta Service Bulletin BT206-94**.\n- Complete this inspection **within 100 hours of flight time** after 30 April 1975.\n\n**Why it matters:**\n- The tail rotor control tube is essential for safe helicopter control. A failure could cause loss of directional control and potentially a crash. This AD was issued to catch potential defects before they cause accidents.\n\n**Background note:** This directive replaced or matched an earlier directive (AD/Agusta 206/52), suggesting CASA was harmonising safety requirements across similar aircraft types."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text sets a clear, narrow inspection requirement (models/serial numbers, referenced service bulletins, and a compliance time). There is no indication in the supplied instrument that the scope was changed from its stated intent; the AD simply imposes the inspection obligation and points to the manufacturer service bulletins for procedural detail (see \"Applicability\", \"Document\", \"Compliance\", \"Background\")."},"complexity_factors":["Narrow technical scope limited to tail rotor control tube inspections on specified 206 models","Explicit, short compliance window (100 hours TIS after 30 April 1975) reduces scheduling ambiguity","Reliance on external manufacturer service bulletins for procedural detail (requires consulting another document)","Applicability conditioned on specific serial numbers increases administrative steps to identify affected aircraft","No additional regulatory procedures, penalties, or alternative compliance paths included in the AD text (reduces regulatory complexity but shifts detail to SBs)"],"plain_english_summary":"This AD mandates a one-time inspection of the tail-rotor control tube on specified Bell/Agusta 206-series helicopters, to be performed per Bell SB 206-75-2 or Agusta SB No. BT206-94 within 100 hours TIS after 30 April 1975. It affects owners/operators of the listed serial-number aircraft; operators must obtain the SB, carry out and fund the inspection and any resulting repairs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-66-tail-rotor-control-tube-inspection","history":"/api/acts/ad-bell-206-66-tail-rotor-control-tube-inspection/history","analysis":"/api/acts/ad-bell-206-66-tail-rotor-control-tube-inspection/analysis","conflicts":"/api/acts/ad-bell-206-66-tail-rotor-control-tube-inspection/conflicts","importantCases":"/api/acts/ad-bell-206-66-tail-rotor-control-tube-inspection/important-cases","documents":"/api/acts/ad-bell-206-66-tail-rotor-control-tube-inspection/documents"}}