{"id":"F2009L01179","name":"AD/BELL 206/177 - Main Rotor - Pitch Horn Trunnion Bearing","slug":"ad-bell-206-177-main-rotor-pitch-horn-trunnion-bearing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":122031,"registerId":"commonwealth-F2009L01179-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron Canada (BHTC) 20","sectionType":"division","heading":"Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters","content":"### Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\n| AD/BELL 206/177 | Main Rotor - Pitch Horn Trunnion Bearing | 5/2009 TX |\n| --------------- | ---------------------------------------- | --------- |\n\n| Applicability: | AB206A and AB206B helicopters, all serial numbers, if fitted with trunnion bearings part number (P/N) 206-011-105-1.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | 1. Unless previously accomplished, inspect the installed trunnion bearings P/N206-011-105-1 to identify a missing lubrication passage as detailed in Agusta Alert BT 206-245 dated 20 March 2009.2. If it is identified that the lubrication passage is missing, replace the part with a serviceable bearing.3. Do not install trunnion bearings P/N 206-011-105-1 on any helicopter, unless inspected in accordance with Agusta Alert BT 206-245.The use of later approved revisions of this document is acceptable for compliance with the requirements of this AD.Note: EASA Emergency AD 2009-0067-E dated 20 March 2009 refers. |\n| Compliance:    | For Requirement 1 - Within 5 flight hours after the effective date of this AD and no later than 30 March 2009, whichever occurs first.For Requirement 2 - Before further flight.For Requirement 3 - After the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                                             |\n|                | This Airworthiness Directive becomes effective on 25 March 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n\n| Background: | There has been one case of a trunnion bearing, P/N 206-011-105-1, manufactured without the lubrication hole. This non-conformity, if not detected and corrected, would adversely affect the pitch horn proper functioning, which could lead to an unsafe condition. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nMark Sinclair  \nDelegate of the Civil Aviation Safety Authority\n\n23 March 2009","sortOrder":0},{"sectionNumber":"AD/BELL 206/177","sectionType":"part","heading":"AD/BELL 206/177","content":"## AD/BELL 206/177","sortOrder":1},{"sectionNumber":"Main Rotor - Pitch Horn Trunnion Bearing","sectionType":"part","heading":"Main Rotor - Pitch Horn Trunnion Bearing","content":"## Main Rotor - Pitch Horn Trunnion Bearing","sortOrder":2},{"sectionNumber":"5/2009 TX","sectionType":"part","heading":"5/2009 TX","content":"## 5/2009 TX","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD’s scope aligns with the stated purpose: it targets a specific non‑conforming part (P/N 206-011-105-1) on AB206A/AB206B helicopters and mandates inspection, replacement if defective, and a prohibition on installing the part without inspection. It does not expand obligations beyond that narrow defect, though it relies on Agusta Alert BT 206-245 for inspection procedures and references a related EASA emergency AD."},"complexity_factors":["Narrow applicability: only AB206A and AB206B helicopters fitted with trunnion bearing P/N 206-011-105-1 (limits scope and affected population).","Urgent, short compliance windows: Requirement 1 within 5 flight hours after effective date or by 30 March 2009 (creates operational disruption risk).","Sequential actions: initial inspection, mandatory replacement if defect found, and prohibition on installation unless inspected (Requirement 1–3).","Dependence on external document: inspection procedures reference Agusta Alert BT 206-245 (operators must obtain and follow that bulletin).","Single identified defect: manufacturing non-conformity (missing lubrication passage) is specific but critical to pitch horn functioning.","Administrative burden: tracking compliance deadlines, grounding aircraft until inspection/replacement, and recording compliance.","Regulatory linkage: AD references EASA Emergency AD 2009-0067-E (alignment with overseas authority may affect international operators)."],"plain_english_summary":"This Airworthiness Directive requires operators of AB206A and AB206B helicopters fitted with trunnion bearing P/N 206-011-105-1 to inspect that bearing for a missing lubrication passage, replace any bearing missing the passage, and prohibits installing that part unless inspected in accordance with Agusta Alert BT 206-245. It responds to a manufactured non-conformity that could impair pitch horn function.\n\nOperators pay for inspections and replacements, must meet short grounding windows (5 flight hours or by 30 March 2009 for the initial inspection), and must follow the external service bulletin to comply."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: addressing a specific manufacturing defect in a single part number for specific helicopter models. There is no evidence of scope creep or expansion beyond the original safety purpose."},"complexity_factors":["Single, specific mechanical defect addressed (missing lubrication passage in one part number)","Only three straightforward requirements: inspect, replace if faulty, don't install uninspected parts","Clear compliance deadlines with simple alternatives (5 flight hours OR calendar date)","No nested definitions, cross-references to other legislation, or conditional exceptions","Background and rationale clearly stated in plain language","Total length is approximately 300 words"],"plain_english_summary":"This emergency Airworthiness Directive requires owners/operators of Bell 206A/206B helicopters with trunnion bearing P/N 206-011-105-1 to inspect that bearing for a lubrication hole and replace it if the hole is missing. \n\nA missing lubrication hole can starve the pitch horn of lubricant, risking pitch-horn failure and loss of rotor control; aircraft are grounded until a compliant bearing is installed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-177-main-rotor-pitch-horn-trunnion-bearing","history":"/api/acts/ad-bell-206-177-main-rotor-pitch-horn-trunnion-bearing/history","analysis":"/api/acts/ad-bell-206-177-main-rotor-pitch-horn-trunnion-bearing/analysis","conflicts":"/api/acts/ad-bell-206-177-main-rotor-pitch-horn-trunnion-bearing/conflicts","importantCases":"/api/acts/ad-bell-206-177-main-rotor-pitch-horn-trunnion-bearing/important-cases","documents":"/api/acts/ad-bell-206-177-main-rotor-pitch-horn-trunnion-bearing/documents"}}