{"id":"F2007L01252","name":"AD/BELL 206/170 - Horizontal Stabiliser Skin at the Tailboom Attachment Inserts","slug":"ad-bell-206-170-horizontal-stabiliser-skin-at-the-tailboom-attachment-inserts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":65389,"registerId":"commonwealth-F2007L01252-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 206/170 | Horizontal Stabiliser Skin at theTailboom Attachment Inserts | 7/2007 DM |\n| --------------- | ------------------------------------------------------------ | --------- |\n\n| Applicability: | Model 206L series helicopters.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Verify the serial number of the horizontal stabiliser in accordance with Part I of BHTC Alert Service Bulletin (ASB) 206L-06-141 original issue, or later Transport Canada approved revision.If the horizontal stabiliser installed on the helicopter has a serial number listed below, accomplish Requirement 2.Affected Serial Numbers:BP1516, -1519, -1521, -1530, -1533, -1536, -1539, -1542, -1560, -1566, -1569,-1572, -1584, -1587, -1607, -1608, -1610, -1612, -1615, -1622, -1629, -1630,-1631, -1634, -1643, -1646, -1659.2. Inspect the affected parts in accordance with Part II of ASB 206L-06-141 original issue, or later Transport Canada approved revision.If damaged parts are detected during any inspection, replace the parts before further flight. If parts are not damaged, repeat the inspection.3. Replace the affected horizontal stabiliser in accordance with Part III of ASB 206L-06-141 original issue, or later Transport Canada approved revision.Note: Transport Canada AD CF-2007-03 refers. |\n| Compliance:    | 1. Within 100 hours time in service after 8 May 2007, but no later than 8 June 2007; unless already accomplished.2. Initially at the time of Requirement 1 compliance, if affected. Repetitively inspect thereafter at intervals not to exceed 600 flight hours or the annual inspection, whichever occurs first; until accomplishment of Requirement 3.3. No later than 30 September 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n|                | This Airworthiness Directive becomes effective on 8 May 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n\n| Background: | Horizontal stabilisers part number 206-023-119-167 may have manufacturing flaws on the inside surface of the upper and/or lower skin at the tailboom attachment inserts. These flaws may result in cracking of the skin and failure of the horizontal stabiliser. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n2 May 2007","sortOrder":0},{"sectionNumber":"AD/BELL 206/170","sectionType":"part","heading":"AD/BELL 206/170","content":"## AD/BELL 206/170","sortOrder":1},{"sectionNumber":"Horizontal Stabiliser Skin at theTailboo","sectionType":"part","heading":"Horizontal Stabiliser Skin at theTailboom Attachment Inserts","content":"## Horizontal Stabiliser Skin at the  \nTailboom Attachment Inserts","sortOrder":2},{"sectionNumber":"7/2007 DM","sectionType":"part","heading":"7/2007 DM","content":"## 7/2007 DM","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":5,"scope_assessment":{"changed":false,"description":"The directive’s scope is confined to Model 206L helicopters fitted with the specified horizontal stabiliser part and the listed serial numbers. It requires inspections and replacement limited to those identified items, matching the stated manufacturing-flaw safety concern (Applicability; Requirement 1; Background)."},"complexity_factors":["Multiple action stages: serial-number verification, detailed inspection, immediate repair/replace of damaged parts, and mandatory eventual replacement (Requirements 1–3).","Short and staged compliance windows: initial check within 100 flight hours or by a calendar date, recurring inspections up to 600 flight hours or annually, and a final replacement deadline (Compliance 1–3).","Narrow applicability but many affected serial numbers: single model series (206L) but a long list of specific stabiliser serial numbers increases tracking and record-check burden (Applicability; Requirement 1; Affected Serial Numbers).","Reliance on an external document: inspections and procedures must follow BHTC ASB 206L-06-141 original issue or later Transport Canada–approved revision, introducing dependency on an external service bulletin and regulator approval (Requirement 1; Requirement 2; Requirement 3).","Operational disruption risk: requirement to replace or ground parts before further flight if damage found creates potential unplanned downtime and replacement costs borne by operators (Requirement 2; Compliance).","Regulatory cross-reference: Transport Canada AD CF-2007-03 is noted, which may affect harmonisation and duplicate compliance steps (Note).","Clear regulator authority and effective date: directive is effective from 8 May 2007, creating an immediate enforcement timeline (Compliance; effective date)."],"plain_english_summary":"This directive orders operators of Bell 206L helicopters to check if their horizontal stabiliser (part 206-023-119-167) is one of a listed set of serial numbers, inspect the skin at the tailboom attachment per the Bell Alert Service Bulletin, repair or replace any damaged parts before further flight, and ultimately replace affected stabilisers by a set deadline. It affects owners, operators and maintenance providers of the listed Model 206L helicopters because identified manufacturing flaws can cause skin cracking and failure."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a narrow, specific safety purpose. It addresses a known manufacturing defect in a particular aircraft part and follows the typical AD format: identify affected products, prescribe inspection/replacement actions, and set compliance deadlines. There is no indication of scope creep or expansion beyond the original safety intent."},"complexity_factors":["Short, single-purpose document (approximately 400 words)","Only 3 main requirements with clear sequential numbering","27 specific serial numbers listed explicitly (no ranges or formulas)","References to external technical document (BHTC Alert Service Bulletin 206L-06-141) without reproducing its contents","Simple conditional logic: 'If affected → inspect; if damaged → replace; if not damaged → repeat inspection'","Three distinct compliance deadlines with clear dates or flight hour intervals","No defined terms section or interpretation provisions","Minimal cross-referencing (only one reference to Transport Canada AD CF-2007-03)"],"plain_english_summary":"This AD requires owners/operators of Bell 206L helicopters to inspect and, if necessary, replace certain horizontal stabilisers identified by serial number because of a manufacturing defect that can cause cracking and failure. It affects only stabilisers listed in the AD.\n\nIf an affected stabiliser is cracked it must be removed before flight; if not, recurring inspections are required and all listed units must be replaced by the AD’s final deadline."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-170-horizontal-stabiliser-skin-at-the-tailboom-attachment-inserts","history":"/api/acts/ad-bell-206-170-horizontal-stabiliser-skin-at-the-tailboom-attachment-inserts/history","analysis":"/api/acts/ad-bell-206-170-horizontal-stabiliser-skin-at-the-tailboom-attachment-inserts/analysis","conflicts":"/api/acts/ad-bell-206-170-horizontal-stabiliser-skin-at-the-tailboom-attachment-inserts/conflicts","importantCases":"/api/acts/ad-bell-206-170-horizontal-stabiliser-skin-at-the-tailboom-attachment-inserts/important-cases","documents":"/api/acts/ad-bell-206-170-horizontal-stabiliser-skin-at-the-tailboom-attachment-inserts/documents"}}