{"id":"F2006B04426","name":"AD/BELL 206/112 Amdt 1 - Tail Rotor Yoke","slug":"ad-bell-206-112-amdt-1-tail-rotor-yoke","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44251,"registerId":"commonwealth-F2006B04426-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/112 Amdt 1 - Tail Rotor Yoke","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 206/112\n\nAmdt 1\n\n\nTail Rotor Yoke 4/89\n\n \n\nApplicability: All model 206A, 206B11, 206B111, 206L, 206L-1, 206L-3, Agusta Bell AB206A and AB206B.\n\n \n\nRequirement: Inspect in accordance with Bell Helicopter Alert Service Bulletin 206-88-41 or 206L-88-51, as applicable.\n\n \n\nNote: FAA AD 88-23-03 and Italian AD 88-215/AB206-121 refer.\n\n \n\nCompliance: Unless already accomplished, within 100 hours time in service from 30 April 1989.\n\n \n\nBackground: A number of tail rotor yokes have been manufactured with the blade attaching bolt holes incorrectly located.\n\n \n\nThis amendment raised to include the Agusta Bell 206 series.\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The original directive (implied by 'Amdt 1') covered Bell Helicopter models only. This amendment expanded scope to include Agusta Bell variants (AB206A and AB206B) — Italian-manufactured versions of the same helicopter design. This is a modest expansion to cover equivalent aircraft from a different manufacturer, not a fundamental shift in purpose."},"complexity_factors":["Single, specific mechanical component addressed (tail rotor yoke)","Straightforward applicability list (8 specific helicopter models)","Clear compliance deadline (100 hours time in service from fixed date)","Only one substantive amendment (expansion to Agusta Bell series)","No nested exceptions, conditional logic, or extensive cross-referencing","References external technical documents (service bulletins) rather than reproducing complex technical specifications inline"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** Orders owners and operators of specific Bell and Agusta Bell helicopter models to inspect their **tail rotor yokes** (the metal component that holds the tail rotor blades). Some yokes were manufactured with bolt holes in the wrong position, which could cause the tail rotor to fail — a potentially catastrophic failure that could cause loss of control.\n\n**Who it affects:** Anyone operating these helicopter models:\n- Bell 206A, 206B-II, 206B-III, 206L, 206L-1, 206L-3\n- Agusta Bell AB206A and AB206B\n\n**What must be done:** Inspect the tail rotor yoke following specific Bell Helicopter service bulletins (206-88-41 or 206L-88-51, depending on model). This must be done within 100 flight hours after 30 April 1989, unless already completed.\n\n**Why it matters:** A faulty tail rotor yoke could crack or fail in flight, leading to loss of directional control and potentially a crash. This amendment expands the original directive to include Agusta Bell variants (Italian-built versions of the same helicopters)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment expanded the scope by adding the Agusta Bell 206 series (AB206A and AB206B) to the list of applicable helicopters. Originally the directive applied to Bell Helicopter Textron Canada 206 models; the change is explicitly noted in the instrument (This amendment raised to include the Agusta Bell 206 series)."},"complexity_factors":["Cross-reference to external manufacturer documents (Bell Helicopter Alert Service Bulletins 206-88-41 and 206L-88-51) for procedural detail (Requirement).","Multiple aircraft models listed in applicability, including the amendment adding Agusta Bell variants (Applicability; This amendment…).","Fixed compliance window tied to a specific date and flight hours (100 hours from 30 April 1989) rather than a recurring or ongoing regime (Compliance).","References to foreign airworthiness directives (FAA and Italian ADs) that may require operators to reconcile multiple directives (Note).","Delegation of inspection specifics to external technical documents increases operational dependence on access to and clarity of those documents (Requirement)."],"plain_english_summary":"Owners/operators of specified Bell and Agusta Bell 206-series helicopters must inspect the tail rotor yoke per the relevant Bell Helicopter Alert Service Bulletin, within 100 hours’ time‑in‑service from 30 April 1989, due to incorrectly located blade‑attaching bolt holes. Issued by CASA, the directive shifts inspection and any corrective costs to operators and references related foreign ADs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-112-amdt-1-tail-rotor-yoke","history":"/api/acts/ad-bell-206-112-amdt-1-tail-rotor-yoke/history","analysis":"/api/acts/ad-bell-206-112-amdt-1-tail-rotor-yoke/analysis","conflicts":"/api/acts/ad-bell-206-112-amdt-1-tail-rotor-yoke/conflicts","importantCases":"/api/acts/ad-bell-206-112-amdt-1-tail-rotor-yoke/important-cases","documents":"/api/acts/ad-bell-206-112-amdt-1-tail-rotor-yoke/documents"}}