{"id":"F2009L03805","name":"AD/BELL 427/12 - Cyclic Control Lever Assembly Installation","slug":"ad-bell-427-12-cyclic-control-lever-assembly-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":81038,"registerId":"commonwealth-F2009L03805-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron 427 Series Helic","sectionType":"division","heading":"Bell Helicopter Textron 427 Series Helicopters","content":"### Bell Helicopter Textron 427 Series Helicopters\n\n| AD/BELL 427/12 | Cyclic Control Lever Assembly Installation | 12/2009 |\n| -------------- | ------------------------------------------ | ------- |\n\n| Applicability: | Model 427 helicopters, all serial numbers.                                                                                                                                                                                                                                                                                                                                                                                                                    |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | For helicopters with less than 50 flight hours in service or with a cyclic lever assembly installed within the last 50 flight hours:Perform a one time inspection and if required, rectification, of the cyclic lever assembly installation, in accordance with accomplishment instructions provided in Bell Alert Service bulletin 427-09-23 dated 10 March 2009, or later Transport Canada approved revision.Note: Transport Canada AD CF-2009-10R1 refers. |\n| Compliance:    | Before further flight after 19 November 2009, unless already accomplished.                                                                                                                                                                                                                                                                                                                                                                                    |\n|                | This Airworthiness Directive becomes effective on 19 November 2009.                                                                                                                                                                                                                                                                                                                                                                                           |\n| Background:    | An incorrectly installed bearing Part Number 206-301-051-101, in the co-pilot cyclic control lever assembly has been discovered during manufacturing. It is possible, that an incorrectly installed bearing could be found in any aircraft with a recently installed cyclic control lever assembly.                                                                                                                                                           |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n28 September 2009","sortOrder":0},{"sectionNumber":"AD/BELL 427/12","sectionType":"part","heading":"AD/BELL 427/12","content":"## AD/BELL 427/12","sortOrder":1},{"sectionNumber":"Cyclic Control Lever Assembly Installati","sectionType":"part","heading":"Cyclic Control Lever Assembly Installation","content":"## Cyclic Control Lever Assembly Installation","sortOrder":2},{"sectionNumber":"12/2009","sectionType":"part","heading":"12/2009","content":"## 12/2009","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific manufacturing defect in a particular helicopter model. The scope remains precisely limited to the safety issue identified in the background section."},"complexity_factors":["Single, clearly defined applicability trigger (flight hours threshold)","One primary action required (inspection and conditional rectification)","References external technical document (Bell Service Bulletin) rather than embedding detailed procedures","Simple compliance deadline (before further flight after fixed date)","No nested exceptions, defined terms section, or cross-referencing to other legislation","Total length is extremely short (under 300 words of substantive content)"],"plain_english_summary":"This CASA Airworthiness Directive orders a one‑time inspection of the co‑pilot cyclic control lever assembly on Bell 427 helicopters to check for an incorrectly installed bearing that could cause flight‑control malfunction.  \n\nIt applies to aircraft with under 50 flight hours or with a cyclic lever installed within the last 50 hours; the check must be done before the next flight after 19 Nov 2009, and any defect must be rectified per Bell Alert Service Bulletin 427‑09‑23."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Based on the instrument text, the scope aligns with the stated safety issue: it targets potentially incorrectly installed bearings in recently installed cyclic lever assemblies by requiring inspection and rectification for aircraft with recent installations or low total hours. The directive does not expand beyond addressing that manufacturing/installation defect."},"complexity_factors":["Conditional applicability: applies to all Model 427 serial numbers but only where aircraft have <50 flight hours or the cyclic lever was installed within the last 50 flight hours (Applicability).","Mandated work is procedural but depends on a referenced external document (Bell Alert Service Bulletin 427‑09‑23 or later TC‑approved revision) which may require interpretation (Requirement).","Firm compliance deadline ('before further flight after 19 Nov 2009') creates scheduling/grounding risk for operators (Compliance).","Determining whether a cyclic lever was 'installed within the last 50 flight hours' requires accurate maintenance records and tracking.","Rectification may need technical judgement, parts and qualified labor — creating direct cost and operational disruption for operators.","Cross-reference to Transport Canada AD and allowance for ‘later Transport Canada approved revision’ introduces inter‑jurisdictional document reliance and potential versioning ambiguity."],"plain_english_summary":"This directive requires Bell 427 operators to perform a one‑time inspection — and, if needed, fix — the co‑pilot cyclic control lever installation on helicopters with under 50 flight hours or where the lever was installed within the last 50 flight hours. Work must follow Bell Alert Service Bulletin 427‑09‑23 or a later Transport Canada‑approved revision. Operators (owners) pay for inspection and any rectification; the regulator set compliance to be met before further flight after 19 November 2009. The measure targets a discovered incorrectly installed bearing."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-427-12-cyclic-control-lever-assembly-installation","history":"/api/acts/ad-bell-427-12-cyclic-control-lever-assembly-installation/history","analysis":"/api/acts/ad-bell-427-12-cyclic-control-lever-assembly-installation/analysis","conflicts":"/api/acts/ad-bell-427-12-cyclic-control-lever-assembly-installation/conflicts","importantCases":"/api/acts/ad-bell-427-12-cyclic-control-lever-assembly-installation/important-cases","documents":"/api/acts/ad-bell-427-12-cyclic-control-lever-assembly-installation/documents"}}