{"id":"F2006L04146","name":"AD/BELL 206/165 - Main Rotor Latch Bolts - Replacement","slug":"ad-bell-206-165-main-rotor-latch-bolts-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":61087,"registerId":"commonwealth-F2006L04146-current","compilationNumber":null,"startDate":"2026-04-02","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 206/165 | Main Rotor Latch Bolts - Replacement | 2/2007 TX |\n| --------------- | ------------------------------------ | --------- |\n\n| Applicability: | All Agusta helicopters AB206A and AB206B series, with Main Rotor latch boltsP/N 206-010-169-1/-3 or P/N 206-011-122-3 installed.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. For main rotor hub assemblies that have accumulated less than 1200 hours time in service (TIS) and are fitted with bolts P/N 206-010-169-1/-3 or 206-011-122-3 which have never been replaced, replace the bolts with new bolts P/N206-011-260-103.2. For main rotor hub assemblies that have accumulated less than 1200 hours time in service (TIS) and bolts P/N 206-010-169-1/-3 or 206-011-122-3 have been replaced; and main rotor hub assemblies that have accumulated 1200 flight hours or more, replace latch bolts with new bolts P/N 206-011-260-103.Note: EASA AD 2006-0371-E and Agusta Alert Bolletino Technico 206-241 dated5 December 2006, or later EASA approved revision, refer. |\n| Compliance:    | 1. Before accumulating 1200 hours time in service (TIS), but not later than25 January 2007, whichever occurs first.2. Within the next 10 hours time in service (TIS) after 18 December 2006, but not later than 25 January 2007, whichever occurs first. However, if it can be determined that bolts P/N 206-010-169-1/-3 and P/N 206-011-122-3 have less than 1200 hours time in service (TIS), they can be replaced with new latch bolts P/N 206-011-260-103 upon accumulating 1200 hours time in service (TIS), but not later than 25 January 2007, whichever occurs first.                                                                                                                        |\n|                | This Airworthiness Directive becomes effective on 18 December 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |\n\n| Background: | A new fatigue analysis of the latch bolts has shown that their fatigue life is less than desired. Hence, the bolts are being replaced with a new bolt with a more acceptable fatigue life. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n15 December 2006","sortOrder":0},{"sectionNumber":"AD/BELL 206/165","sectionType":"part","heading":"AD/BELL 206/165","content":"## AD/BELL 206/165","sortOrder":1},{"sectionNumber":"Main Rotor Latch Bolts - Replacement","sectionType":"part","heading":"Main Rotor Latch Bolts - Replacement","content":"## Main Rotor Latch Bolts - Replacement","sortOrder":2},{"sectionNumber":"2/2007 TX","sectionType":"part","heading":"2/2007 TX","content":"## 2/2007 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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Scope is limited to Agusta AB206A and AB206B helicopters fitted with the specified latch-bolt part numbers; the instrument directs replacement of those bolts due to reduced fatigue life and does not expand to other models or components."},"complexity_factors":["Multiple specific part numbers involved (old P/N 206-010-169-1/-3 and 206-011-122-3; new P/N 206-011-260-103) requiring precise identification (Applicability/Requirement).","Conditional replacement rules depending on accumulated hours time in service (TIS) and whether bolts have previously been replaced (Requirement).","Multiple, overlapping compliance deadlines (before 1200 TIS, within 10 TIS after 18 Dec 2006, and an absolute date of 25 Jan 2007) increasing scheduling complexity (Compliance).","Necessitates verification of maintenance records to determine bolt history and TIS, creating an administrative burden for operators (Requirement/Compliance).","Cross-reference to EASA AD and Agusta Alert Bolletino Technico creates dependence on external documents for implementation details (Requirement/Note).","Immediate effective date (18 Dec 2006) and short near-term windows can pressure parts procurement and operational availability (Compliance/Background)."],"plain_english_summary":"Requires replacement of specific main-rotor latch bolts on Agusta AB206A/B helicopters because a fatigue analysis found the existing bolts have insufficient fatigue life. Operators with bolts P/N 206-010-169-1/-3 or 206-011-122-3 must install new bolts P/N 206-011-260-103 by the specified hours-in-service thresholds or by 25 January 2007; short compliance windows and part-tracking determine who pays, when aircraft are grounded, and the administrative burden."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive addressing a specific mechanical defect in a defined aircraft fleet. The scope remains precisely limited to main rotor latch bolt replacement on the specified helicopter models, consistent with the original safety purpose."},"complexity_factors":["Multiple conditional compliance paths based on flight hours (TIS) and replacement history","Nested date and hour thresholds creating four possible compliance scenarios","Cross-reference to European aviation safety documentation (EASA AD 2006-0371-E and Agusta technical bulletin)","Specific part number tracking required (three old P/Ns, one new P/N)","Dual deadline structure (flight hours vs. calendar date — 'whichever occurs first')"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of Agusta AB206A/AB206B helicopters with original main-rotor latch bolts to replace them with the specified stronger bolts because fatigue-prone originals can fail and cause catastrophic rotor loss. Replacement is mandated by flight-hour thresholds or a near-term calendar deadline; failure to comply grounds the aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-165-main-rotor-latch-bolts-replacement","history":"/api/acts/ad-bell-206-165-main-rotor-latch-bolts-replacement/history","analysis":"/api/acts/ad-bell-206-165-main-rotor-latch-bolts-replacement/analysis","conflicts":"/api/acts/ad-bell-206-165-main-rotor-latch-bolts-replacement/conflicts","importantCases":"/api/acts/ad-bell-206-165-main-rotor-latch-bolts-replacement/important-cases","documents":"/api/acts/ad-bell-206-165-main-rotor-latch-bolts-replacement/documents"}}