{"id":"F2007L01349","name":"AD/BELL 206/168 - Upper Left Hand Tailboom Attachment","slug":"ad-bell-206-168-upper-left-hand-tailboom-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":65591,"registerId":"commonwealth-F2007L01349-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 206/168 | Upper Left Hand Tailboom Attachment | 6/2007 |\n| --------------- | ----------------------------------- | ------ |\n\n| Applicability: | Model 206A, 206B, 206L, 206L-1, 206L-3, and 206L-4 helicopters.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Determine if the upper left hand tailboom attachment fitting is a CRES steel fitting, part number 407-030-750-103.If a CRES fitting is installed, inspect the bolt and, if required, correct the washer installation in accordance with Part I of Bell Helicopter Textron Canada Alert Service Bulletin 206-06-110 or 206L-06-140, as applicable; or later Transport Canada approved revisions.If replacement is necessary as a result of the bolt inspection, proceed as follows:2. Replace the upper left hand bolt in accordance with Part II of Bell Helicopter Textron Canada Alert Service Bulletin 206-06-110 or 206L-06-140, as applicable; or later Transport Canada approved revisions.3. Perform a torque check of the upper left hand tailboom attaching hardware in accordance with the applicable maintenance manual.Note: Transport Canada AD CF-2007-01 refers. |\n| Compliance:    | 1. Within 50 hours time in service after 10 May 2007, unless already accomplished.2. At the next scheduled 100-hour inspection or annual inspection, whichever occurs first; following accomplishment of Part I of the applicable Requirement document.3. At the next scheduled 100-hour inspection following bolt replacement.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n|                | This Airworthiness Directive becomes effective on 7 June 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n\n| Background: | The manufacturer has determined that some helicopters that have a CRES steel fitting installed at the upper left hand location of the tailboom, may have an attachment bolt that does not meet the design criteria. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n24 April 2007","sortOrder":0},{"sectionNumber":"AD/BELL 206/168","sectionType":"part","heading":"AD/BELL 206/168","content":"## AD/BELL 206/168","sortOrder":1},{"sectionNumber":"Upper Left Hand Tailboom Attachment","sectionType":"part","heading":"Upper Left Hand Tailboom Attachment","content":"## Upper Left Hand Tailboom Attachment","sortOrder":2},{"sectionNumber":"6/2007","sectionType":"part","heading":"6/2007","content":"## 6/2007","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":3,"scope_assessment":{"changed":false,"description":"The directive addresses a specific non‑conforming bolt at the upper left tailboom attachment for the listed 206 models and prescribes inspection, correction, replacement and torque checks. It does not expand applicability beyond the stated models or add unrelated components; it implements remedial actions consistent with the stated safety finding."},"complexity_factors":["Applicability covers multiple 206 models (operational scope across fleet).","Requirements reference external Bell Alert Service Bulletins (Part I/II) and Transport Canada–approved revisions (dependency on external documents).","Three distinct technical actions: inspect/correct washer installation, replace bolt if required, and perform a torque check (sequencing and technical skill required).","Multiple compliance windows: within 50 hours TIS, at next 100‑hour/annual inspection, and at the next 100‑hour after replacement (scheduling complexity).","Identification of a specific CRES steel fitting (part 407-030-750-103) and bolt condition (needs technical inspection capability).","Operator bears costs and operational downtime for inspection, corrective action and parts (implied by Requirement and Compliance sections).","Cross-reference to Transport Canada AD CF-2007-01 adds regulatory linkage and potential for differing amendment paths."],"plain_english_summary":"Requires operators of specified Bell/Agusta 206 helicopters to inspect the upper left tailboom attachment when a CRES fitting (part 407-030-750-103) is installed, correct washer installation or replace the bolt if required, and perform a torque check using Bell Alert Service Bulletins and the maintenance manual. Deadlines: within 50 hours TIS, at the next 100‑hour/annual inspection, or after bolt replacement. Operators pay for inspections, repairs and downtime. It responds to bolts that may not meet design criteria."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific manufacturing defect in a defined parts population. The scope remains precisely limited to the identified safety issue with the upper left hand tailboom attachment fitting on specified Bell 206 variants."},"complexity_factors":["Short, single-purpose directive with clear sequential steps","Only 6 defined helicopter models in applicability","Two alternative service bulletins referenced (206-06-110 or 206L-06-140) depending on model","Three-tier compliance schedule with conditional timing","One technical term requiring knowledge (CRES steel = Corrosion-Resistant Steel)","No nested exceptions or complex cross-referencing to other legislation"],"plain_english_summary":"Owners and operators of certain Bell 206 series helicopters must inspect the upper left tailboom attachment for a CRES steel fitting with a potentially non‑conforming attachment bolt. If present, the bolt and washer installation must be inspected and corrected per Bell's service bulletin, with replacement and torque checks as needed.\n\nThis mandatory AD (initial inspection within 50 flight hours after 10 May 2007) prevents possible tailboom separation and catastrophic failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-168-upper-left-hand-tailboom-attachment","history":"/api/acts/ad-bell-206-168-upper-left-hand-tailboom-attachment/history","analysis":"/api/acts/ad-bell-206-168-upper-left-hand-tailboom-attachment/analysis","conflicts":"/api/acts/ad-bell-206-168-upper-left-hand-tailboom-attachment/conflicts","importantCases":"/api/acts/ad-bell-206-168-upper-left-hand-tailboom-attachment/important-cases","documents":"/api/acts/ad-bell-206-168-upper-left-hand-tailboom-attachment/documents"}}