{"id":"F2006B04394","name":"AD/BELL 205/58 - Time Expired Tail Rotor Yoke","slug":"ad-bell-205-58-time-expired-tail-rotor-yoke","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44219,"registerId":"commonwealth-F2006B04394-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 205/58 - Time Expired 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 205 Series Helicopters\n\n \n\nAD/BELL 205/58 Time Expired Tail Rotor Yoke 4/90\n\nApplicability: All models fitted with aluminium tail rotor grips P/N 204-011-728-19. Requirement: Inspect and remove from service any tail rotor grip with any of the following S/Nos:\n\n| A3-66287 | A3-66365 | A3-67171 | A3-66333 |\n| --- | --- | --- | --- |\n| A3-66370 | A3-67184 | A3-66356 | A3-66377 |\n| A3-67207 | A3-66361 | A3-67149 |  |\n\n\n \n\nNote: FAA Priority Letter AD 90-03-10 refers.\n\n \n\nCompliance: Prior to further flight after 19 February 1990.\n\n \n\nBackground: Advice has been received that a number of tail rotor grips previously operated for 300 hours time in service are being misrepresented as new items.\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 issued in 1990. It addresses a specific manufacturing/sourcing fraud issue without expanding beyond its original scope of grounding dangerous tail rotor components."},"complexity_factors":["Single, unambiguous requirement: inspect and remove specific serial numbers","Only 11 serial numbers to check against, presented in a simple table","No defined terms requiring interpretation","No cross-references to other legislation (only a non-binding note about an FAA document)","No conditional logic or exceptions — straightforward mandatory action","Extremely short document (under 200 words of substantive content)"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) telling helicopter operators they must check and ground certain parts.\n\n**What it does:**\n- **Targets:** Bell 205 series helicopters (think Vietnam-era \"Huey\" style choppers) fitted with specific aluminium tail rotor grips (part number 204-011-728-19)\n- **The problem:** Some tail rotor grips that had already flown 300 hours were being falsely sold and installed as \"new\" parts. These are critical components — if they fail, the helicopter loses directional control and crashes.\n- **The fix:** Operators must immediately inspect their helicopters and permanently remove from service any tail rotor grip with the 11 specific serial numbers listed in the table. No exceptions.\n\n**Who it affects:** Anyone operating or maintaining Bell 205 helicopters in Australia — including emergency services, military contractors, tourism operators, and private owners.\n\n**Why it matters:** This is an emergency safety intervention. The \"compliance\" deadline (before any further flight after 19 February 1990) shows CASA treated this as an immediate grounding risk. A failed tail rotor grip means the pilot cannot control the helicopter's yaw — a catastrophic failure mode."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument applies to a specific part number and a fixed list of serial numbers and requires their removal from service prior to further flight after 19 February 1990. The text does not amend or broaden that applicability; it enforces removal of identified items only (Applicability; Requirement; Compliance)."},"complexity_factors":["Narrow technical scope: applies only to Bell 205 helicopters fitted with aluminium tail rotor grip P/N 204-011-728-19 (Applicability).","Action is binary and discrete: inspect and remove any grip with one of a short list of serial numbers (Requirement).","Short, fixed compliance deadline creates time pressure for affected operators (Compliance).","Verification requires matching physical serial numbers or maintenance records, which imposes operational/administrative steps but no complex analysis (Requirement; Background).","Cross-reference to FAA Priority Letter AD adds an external reference but does not materially increase procedural complexity (Note).","The AD does not provide step-by-step verification or replacement procedures, creating a modest procedural gap operators must resolve using their maintenance systems (Requirement; Background)."],"plain_english_summary":"This AD requires Bell 205 operators to inspect installed aluminium tail-rotor grips (P/N 204-011-728-19) and remove from service any grips matching the AD’s listed serial numbers before the next flight after 19 February 1990. It affects owners/operators of fitted helicopters and responds to discovered misrepresentation of previously used grips as new, eliminating identified unsafe parts."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-205-58-time-expired-tail-rotor-yoke","history":"/api/acts/ad-bell-205-58-time-expired-tail-rotor-yoke/history","analysis":"/api/acts/ad-bell-205-58-time-expired-tail-rotor-yoke/analysis","conflicts":"/api/acts/ad-bell-205-58-time-expired-tail-rotor-yoke/conflicts","importantCases":"/api/acts/ad-bell-205-58-time-expired-tail-rotor-yoke/important-cases","documents":"/api/acts/ad-bell-205-58-time-expired-tail-rotor-yoke/documents"}}