{"id":"F2006B04415","name":"AD/BELL 206/101 Amdt 1 - Tail Boom to Gearbox Attachment","slug":"ad-bell-206-101-amdt-1-tail-boom-to-gearbox-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44240,"registerId":"commonwealth-F2006B04415-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/101 Amdt 1 - Tail Boom to Gearbox Attachment","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 11/1988,Rotorcraft,Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters,Tail Boom to Gearbox Attachment,101 Amdt 1\ntitle: Airworthiness Directive - AD/BELL 206/101 Amdt 1 - Tail Boom to Gearbox Attachment\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 206/101\n\nAmdt 1\n\n\nTail Boom to Gearbox Attachment 11/88\n\nDM\n\n \n\nApplicability: All Augusta Bell AB206A and AB206B equipped with tail rotor hub assembly P/N 206-011-810 (all dash numbers).\n\n \n\nRequirement: Inspect the tail boom in accordance with Agusta Technical Bulletin 206-172 Rev A. Compliance:               As detailed in the Requirement Document.\n\nBackground:  Agusta Technical Bulletin 206-172 reports cracks in service near the gearbox mounting and introduces a mandatory inspection schedule. This revision adds a torque check of the tail gear box fixing nut.\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1214},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The amendment expands the original directive's scope by adding a mandatory torque check of the tail gear box fixing nut to the pre-existing crack inspection requirement, increasing the maintenance burden beyond the initial visual inspection regime."},"complexity_factors":["Very short single-page instrument with only one substantive requirement","External incorporation of manufacturer technical bulletin by reference","Limited applicability restricted to specific aircraft models and part numbers","Simple amendment structure adding one additional task (torque check) to existing inspection"],"plain_english_summary":"This is a **helicopter safety rule** issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations.\n\nIt requires operators of specific Augusta Bell helicopter models (AB206A and AB206B series equipped with tail rotor hub assembly part number 206-011-810) to:\n\n* **Inspect the tail boom** for cracks near where it attaches to the gearbox, following the manufacturer's Technical Bulletin 206-172 Rev A\n* **Check the torque** (tightness) of the nut that holds the tail gearbox in place — this is a new requirement added by this amendment\n\n**Who it affects:** Helicopter operators, pilots, and maintenance engineers working on these specific Bell/Agusta models.\n\n**Why it matters:** Cracks near the gearbox mounting can weaken the aircraft structure and potentially cause the tail section to fail. The added torque check ensures the gearbox remains securely attached during flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-101-amdt-1-tail-boom-to-gearbox-attachment","history":"/api/acts/ad-bell-206-101-amdt-1-tail-boom-to-gearbox-attachment/history","analysis":"/api/acts/ad-bell-206-101-amdt-1-tail-boom-to-gearbox-attachment/analysis","conflicts":"/api/acts/ad-bell-206-101-amdt-1-tail-boom-to-gearbox-attachment/conflicts","importantCases":"/api/acts/ad-bell-206-101-amdt-1-tail-boom-to-gearbox-attachment/important-cases","documents":"/api/acts/ad-bell-206-101-amdt-1-tail-boom-to-gearbox-attachment/documents"}}