{"id":"F2009L01644","name":"AD/BELL 407/36 - Anti-drive Link Assembly","slug":"ad-bell-407-36-anti-drive-link-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78440,"registerId":"commonwealth-F2009L01644-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron Canada (BHTC) 40","sectionType":"division","heading":"Bell Helicopter Textron Canada (BHTC) 407 Series Helicopters","content":"### Bell Helicopter Textron Canada (BHTC) 407 Series Helicopters\n\n| AD/BELL 407/36 | Anti-drive Link Assembly | 7/2009 TX |\n| -------------- | ------------------------ | --------- |\n\n| Applicability: | Bell Helicopter Textron Canada (BHTC) Helicopter Models 407 with anti-drive link assembly Part Number (P/N) 406-010-432-101 with a serial number (S/N) prefix TI or TIFS.Models affected: Model 407 - S/N 53000 through 53887, 53890 through 53916, 53918, 53920, 53921, 53923 through 53926, and 53928.                                                                         |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Perform a one time inspection and if required, rectification, of the anti-drive link assembly P/N 406-010-432-101 to ensure that bearing P/N 406-310-403-101 is correctly staked in the link assembly in accordance with BHTC Alert Service Bulletin 407-09-87, dated 27 March 2009, or later approved revision.Note: Transport Canada AD CF-2009-14 dated 15 April 2009 refers. |\n| Compliance:    | Within the next 10 flight hours, but no later than 30 days from the effective day of this AD, unless already accomplished.                                                                                                                                                                                                                                                       |\n|                | This Airworthiness Directive becomes effective on 6 May 2009.                                                                                                                                                                                                                                                                                                                    |\n| Background:    | During a pre-flight check it was observed that the swash plate link assembly bearing P/N 406-310-403-101 had moved in the lever race making contact with the swash plate support. Further investigation has revealed that the bearing had not been staked correctly during manufacture.This situation, if not corrected, could lead to loss of control of the helicopter.        |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n30 April 2009","sortOrder":0},{"sectionNumber":"AD/BELL 407/36","sectionType":"part","heading":"AD/BELL 407/36","content":"## AD/BELL 407/36","sortOrder":1},{"sectionNumber":"Anti-drive Link Assembly","sectionType":"part","heading":"Anti-drive Link Assembly","content":"## Anti-drive Link Assembly","sortOrder":2},{"sectionNumber":"7/2009 TX","sectionType":"part","heading":"7/2009 TX","content":"## 7/2009 TX","sortOrder":3}],"analysis":{"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, targeted Airworthiness Directive addressing a specific manufacturing defect in a particular helicopter model. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, specific mechanical issue with clear part numbers and serial number ranges","One-time inspection requirement with straightforward compliance timeframe","No nested exceptions or conditional logic — applies or doesn't apply based on clear criteria","Short document (approximately 250 words) with minimal cross-referencing","Only references one external technical document (the manufacturer's service bulletin)","No defined terms section — uses standard aviation terminology"],"plain_english_summary":"CASA mandates a one-time inspection—and repair if needed—of the anti-drive link assembly bearing on certain Bell 407 helicopters (specific serial-number range and P/N/serials) because the bearing may not have been properly secured in manufacture. The AD requires action within 10 flight hours or 30 days of 6 May 2009 to prevent bearing displacement that could contact other components and lead to loss of control."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive confines action to the originally identified affected parts and serial-numbered helicopters and mandates a single corrective inspection/rectification; it does not broaden applicability or introduce ongoing obligations beyond the one-time action."},"complexity_factors":["Narrow applicability: specific part number (P/N 406-010-432-101) and serial number prefixes/ranges restrict affected fleet.","Single mandatory action: one-time inspection and rectification reduces ongoing regulatory complexity.","Technical nature of defect: correct staking of bearing P/N 406-310-403-101 requires qualified maintenance and possible rework or parts handling.","Short compliance window (10 flight hours or 30 days) imposes operational scheduling pressure on operators.","Dependence on external document: required compliance references BHTC Alert Service Bulletin 407-09-87 (and Transport Canada AD CF-2009-14).","Safety consequence is high (potential loss of control), increasing administrative urgency and possible prioritisation by operators."],"plain_english_summary":"This Airworthiness Directive orders a one‑time inspection and any needed repair of the anti‑drive link assembly P/N 406‑010‑432‑101 on specified Bell 407 helicopters (S/N prefix TI or TIFS and listed serial ranges), to confirm bearing P/N 406‑310‑403‑101 is correctly staked. Operators and maintenance providers must complete the check within 10 flight hours or 30 days and follow BHTC Alert Service Bulletin 407‑09‑87. The directive was issued to address observed bearing movement that could lead to loss of control; owners/operators pay inspection and rectification costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-407-36-anti-drive-link-assembly","history":"/api/acts/ad-bell-407-36-anti-drive-link-assembly/history","analysis":"/api/acts/ad-bell-407-36-anti-drive-link-assembly/analysis","conflicts":"/api/acts/ad-bell-407-36-anti-drive-link-assembly/conflicts","importantCases":"/api/acts/ad-bell-407-36-anti-drive-link-assembly/important-cases","documents":"/api/acts/ad-bell-407-36-anti-drive-link-assembly/documents"}}