{"id":"F2007L04015","name":"AD/BELL 222/42 - Tail Rotor Pitch Change Mechanism","slug":"ad-bell-222-42-tail-rotor-pitch-change-mechanism","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":160806,"registerId":"commonwealth-F2007L04015-current","compilationNumber":null,"startDate":"2026-04-04","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron Canada (BHTC) 22","sectionType":"division","heading":"Bell Helicopter Textron Canada (BHTC) 222 Series Helicopters","content":"### Bell Helicopter Textron Canada (BHTC) 222 Series Helicopters\n\n| AD/BELL 222/42 | Tail Rotor Pitch Change Mechanism | 11/2007 |\n| -------------- | --------------------------------- | ------- |\n\n| Applicability: | Bell Helicopter Textron Canada (BHTC) Model 230 helicopters.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Verify the existing rigging of the tail rotor pitch change mechanism in accordance with Accomplishment Instructions provided in Alert Service Bulletin (ASB) 230-07-36 dated 9 January 2007 or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.2. Verify if the tail rotor yoke needs to be replaced as per Item 3 of Accomplishment Instructions provided in above ASB. If required, replace the yoke with airworthy part.3. Perform a new rigging procedure as per Accomplishment Instructions provided in above ASB.Note: Transport Canada AD CF-2007-12 dated 17 September 2007 refers. |\n| Compliance:    | At the next 150 hour or annual inspection but no later than 31 December 2007, unless already accomplished.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n|                | This Airworthiness Directive becomes effective on 25 October 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |\n| Background:    | It has been determined that the existing rigging procedures for the tail rotor pitch change mechanism have to be changed due to possibility of parts interference. This AD mandates verification of the tail rotor pitch change mechanism, and new rigging procedures.                                                                                                                                                                                                                                                                                                                                                           |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n14 September 2007","sortOrder":0},{"sectionNumber":"AD/BELL 222/42","sectionType":"part","heading":"AD/BELL 222/42","content":"## AD/BELL 222/42","sortOrder":1},{"sectionNumber":"Tail Rotor Pitch Change Mechanism","sectionType":"part","heading":"Tail Rotor Pitch Change Mechanism","content":"## Tail Rotor Pitch Change Mechanism","sortOrder":2},{"sectionNumber":"11/2007","sectionType":"part","heading":"11/2007","content":"## 11/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope targets verification and re‑rigging of the tail‑rotor pitch change mechanism on BHTC Model 230 helicopters only, as set out in the Requirement and Applicability. The AD does not expand applicability beyond that aircraft type or add unrelated obligations; it relies on the ASB and Transport Canada approvals for procedural detail."},"complexity_factors":["Technical maintenance work: requires qualified technicians to verify rigging and perform re‑rigging and potential part replacement (Requirement: ASB 230‑07‑36).","Dependence on external documents and approvals: detailed procedures and acceptable revisions are those in the Alert Service Bulletin and later revisions approved by the Chief, Continuing Airworthiness, Transport Canada (Requirement).","Compliance timing: must be done by the next 150‑hour or annual inspection or by a fixed calendar date (Compliance), requiring fleet scheduling.","Parts replacement contingency: potential cost and logistics if the tail rotor yoke must be replaced (Requirement item 3).","Document/identifier inconsistency: AD heading/numbering differs from applicability text (AD/BELL 222/42 vs Model 230), creating possible administrative confusion."],"plain_english_summary":"Requires operators of Bell Helicopter Textron Canada Model 230 helicopters to inspect the tail‑rotor pitch change mechanism, replace the tail‑rotor yoke if Item 3 of the cited Alert Service Bulletin applies, and perform a new rigging procedure per ASB 230‑07‑36. The measure aims to prevent possible parts interference; operators (owners/maintenance providers) pay for inspections, parts and labour and must comply by the next 150‑hour or annual inspection or by 31 December 2007."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard single-issue Airworthiness Directive addressing a specific safety defect in a specific aircraft type. The scope remains tightly focused on the tail rotor pitch change mechanism rigging issue as originally identified."},"complexity_factors":["Very short document (approximately 300 words)","Only 1 defined applicability criterion (specific helicopter model)","Simple three-step compliance requirement with clear reference to external technical document (Alert Service Bulletin)","Single compliance deadline with straightforward alternative timing (next inspection OR fixed date)","No nested exceptions, conditional logic, or cross-references to other legislation","Minimal legal terminology — primarily technical aviation terms"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of Bell Helicopter Textron Canada Model 230 helicopters to inspect and, if necessary, correct the tail rotor pitch‑change rigging and replace a worn tail rotor yoke per Bell Alert Service Bulletin 230‑07‑36. Compliance is required by the next 150‑hour or annual inspection (or by 31 Dec 2007 if earlier). It prevents mechanical interference in the tail rotor that could cause catastrophic loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-222-42-tail-rotor-pitch-change-mechanism","history":"/api/acts/ad-bell-222-42-tail-rotor-pitch-change-mechanism/history","analysis":"/api/acts/ad-bell-222-42-tail-rotor-pitch-change-mechanism/analysis","conflicts":"/api/acts/ad-bell-222-42-tail-rotor-pitch-change-mechanism/conflicts","importantCases":"/api/acts/ad-bell-222-42-tail-rotor-pitch-change-mechanism/important-cases","documents":"/api/acts/ad-bell-222-42-tail-rotor-pitch-change-mechanism/documents"}}