{"id":"F2006B04329","name":"AD/BELL 204/25 - Swashplate Support Assembly P/N 204-011-404-9 - Replacement","slug":"ad-bell-204-25-swashplate-support-assembly-p-n-204-011-404-9-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44144,"registerId":"commonwealth-F2006B04329-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 204/25 - Swashplate Support Assembly P/N 204-011-404-9 - Replacement","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\n![](image.001.png)  Bell Helicopter Textron 204 Series Helicopters\n\n \n\nAD/BELL 204/25 Swashplate Support Assembly NK\n\nP/N 204-011-404-9 - Replacement\n\n \n\nApplicability: All models 204B. Document:  Bell SB No. 204-76-6.\n\nCompliance: As detailed in the requirement document.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive targeting a specific mechanical defect in a specific helicopter model. It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document — only 8 substantive lines","No defined terms section","No conditional logic or nested exceptions","Single, clear mechanical requirement (replace one specific part)","Cross-reference to only one external document (Bell SB No. 204-76-6)","No penalty provisions, appeal mechanisms, or administrative procedures included"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) for Australian-registered aircraft.\n\n**What it does:** It requires owners and operators of **Bell 204B helicopters** to replace a specific part called the **\"swashplate support assembly\"** (part number 204-011-404-9). The swashplate is a critical component that translates pilot control inputs into blade pitch changes — essentially what lets the pilot steer and control the helicopter.\n\n**Who it affects:** Anyone who owns, operates, or maintains a Bell 204B helicopter in Australia.\n\n**Why it matters:** The directive references a Bell Service Bulletin (SB 204-76-6), which typically means the manufacturer identified a safety defect or wear issue with this part. If the swashplate support fails in flight, the pilot could lose control of the helicopter. This AD makes the replacement mandatory rather than optional.\n\n**What must be done:** Operators must follow the instructions in Bell Service Bulletin No. 204-76-6 to replace the specified part. The exact deadline depends on what's written in that service bulletin (hours flown, calendar time, or condition-based)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD, as drafted in the provided text, applies to all Bell 204B helicopters and mandates replacement of the swashplate support assembly P/N 204-011-404-9 by reference to Bell SB No. 204-76-6 (see \"Applicability: All models 204B\" and \"Document: Bell SB No. 204-76-6\"). There is no indication in this excerpt that the scope has been broadened or narrowed from its apparent original mechanical purpose (replacement of the specified part)."},"complexity_factors":["Reliance on external technical document (Bell SB No. 204-76-6) for all operative details and timing.","Technical subject matter (swashplate support assembly replacement) requires specialised maintenance skills and parts.","Regulatory framing under Civil Aviation Regulations 1998, Part 39 - 105 creates a mandatory compliance obligation but the excerpt does not set timelines or alternative compliance paths.","Applicability across an entire model fleet (all 204B) increases aggregate operational impact and coordination needs.","Lack of an explicit safety rationale or cost estimate in the AD excerpt increases uncertainty for operators planning implementation."],"plain_english_summary":"This CASA airworthiness directive mandates replacement of the swashplate support assembly (P/N 204-011-404-9) on all Bell 204B helicopters, with compliance to the detailed procedures and timing in Bell Service Bulletin No. 204-76-6. Owners/operators and maintenance organisations must schedule, fund and record the work; CASA issues the mandate and the service bulletin provides the technical method."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-204-25-swashplate-support-assembly-p-n-204-011-404-9-replacement","history":"/api/acts/ad-bell-204-25-swashplate-support-assembly-p-n-204-011-404-9-replacement/history","analysis":"/api/acts/ad-bell-204-25-swashplate-support-assembly-p-n-204-011-404-9-replacement/analysis","conflicts":"/api/acts/ad-bell-204-25-swashplate-support-assembly-p-n-204-011-404-9-replacement/conflicts","importantCases":"/api/acts/ad-bell-204-25-swashplate-support-assembly-p-n-204-011-404-9-replacement/important-cases","documents":"/api/acts/ad-bell-204-25-swashplate-support-assembly-p-n-204-011-404-9-replacement/documents"}}