{"id":"F2007L02680","name":"AD/BO 105/17 - Main Rotorhead Parts","slug":"ad-bo-105-17-main-rotorhead-parts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":68563,"registerId":"commonwealth-F2007L02680-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Eurocopter BO 105 Series Helicopters","sectionType":"division","heading":"Eurocopter BO 105 Series Helicopters","content":"### Eurocopter BO 105 Series Helicopters\n\n| AD/BO 105/17 | Main Rotorhead Parts | 10/2007 |\n| ------------ | -------------------- | ------- |\n\n| Applicability: | All Eurocopter Canada model BO 105 LS A-3 helicopters.                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Incorporate the changes to the “TCI-List”, in accordance with the Accomplishment Instructions of Eurocopter Canada Alert Service Bulletin No. ASB BO 105 LS 10-11, dated 11 May 2005, or later Transport Canada approved revision.Replace and re-identify affected parts in accordance with Item 1.D. (Compliance) and Item 2. (Accomplishment Instructions) of ASB BO 105 LS 10-11, dated 11 May 2005, or later Transport Canada approved revision.Note: Transport Canada AD CF-2005-17 refers. |\n| Compliance:    | Unless already accomplished, within 4 weeks after 27 September 2007.                                                                                                                                                                                                                                                                                                                                                                                                                             |\n|                | This Airworthiness Directive becomes effective on 27 September 2007.                                                                                                                                                                                                                                                                                                                                                                                                                             |\n| Background:    | On various BO 105 types, several structurally identical parts of the same part numbers are being used. However, because these parts are subject to different loadings, their life limitations will vary. Therefore, it is necessary to re-identify these parts and establish their life limits.                                                                                                                                                                                                  |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n13 August 2007","sortOrder":0},{"sectionNumber":"AD/BO 105/17","sectionType":"part","heading":"AD/BO 105/17","content":"## AD/BO 105/17","sortOrder":1},{"sectionNumber":"Main Rotorhead Parts","sectionType":"part","heading":"Main Rotorhead Parts","content":"## Main Rotorhead Parts","sortOrder":2},{"sectionNumber":"10/2007","sectionType":"part","heading":"10/2007","content":"## 10/2007","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 directive confines its effect to Eurocopter Canada BO 105 LS A-3 helicopters and to main rotorhead parts, and it mandates implementation of an existing Eurocopter Canada service bulletin. There is no text indicating an expansion or narrowing of scope beyond requiring operators to follow the ASB and Transport Canada AD; therefore the scope appears consistent with the instrument’s stated intent to re-identify parts and establish life limits."},"complexity_factors":["Directs compliance with an external technical document (Eurocopter Canada ASB BO 105 LS 10-11) and cross-references Transport Canada AD CF-2005-17 — dependency on outside material raises procedural complexity.","Technical task: re-identification and possible replacement of structurally identical parts that have different life limits — requires shop capability for marking, part-traceability and inspection.","Short compliance window (4 weeks after 27 Sep 2007) increases scheduling pressure for operators and maintenance providers.","Financial and operational impact concentrated on BO 105 LS A-3 owners/operators who must pay for parts, labour and administrative record updates.","Terminology ambiguity: terms like “TCI‑List” and specific re-identification procedures are defined by the cited ASB rather than in the AD itself, requiring reliance on the ASB for implementation details.","Limited applicability (single model) reduces regulatory breadth but concentrates compliance burden on a small set of operators.","Recordkeeping and certification of compliance required, creating administrative burden for maintenance organisations."],"plain_english_summary":"This Airworthiness Directive requires operators of Eurocopter Canada BO 105 LS A-3 helicopters to apply changes to the parts identification list (the “TCI‑List”) and to replace and re‑identify affected main rotorhead parts in accordance with Eurocopter Canada Alert Service Bulletin ASB BO 105 LS 10‑11. The mandated work must be completed within four weeks after 27 September 2007. Mechanically, it forces maintenance organisations and owners to mark or swap parts so each part’s life limit matches the loading it actually experiences; owners/operators bear the parts and labour costs and must record compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive addressing a specific safety issue (part identification and life limits) for a specific helicopter model. The scope remains tightly focused on the original safety concern without expansion into unrelated areas."},"complexity_factors":["Single, specific helicopter model affected (BO 105 LS A-3)","Only two main requirements: update TCI-List and replace/re-identify parts","Clear compliance deadline (4 weeks from effective date)","References only one external document (Eurocopter Canada ASB BO 105 LS 10-11)","No nested exceptions or conditional logic","Background explanation is straightforward and concise","Total length is approximately 200 words of substantive content"],"plain_english_summary":"CASA issued a mandatory Airworthiness Directive for owners/operators of Eurocopter Canada BO 105 LS A-3 helicopters requiring an update to the TCI‑List and the replacement and re‑identification of certain main-rotorhead parts per Eurocopter ASB.\n\nIdentical part numbers masked different stress/life limits depending on installation, risking parts being used beyond their safe life and possible catastrophic rotor failure; compliance was required within four weeks of 27 September 2007."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bo-105-17-main-rotorhead-parts","history":"/api/acts/ad-bo-105-17-main-rotorhead-parts/history","analysis":"/api/acts/ad-bo-105-17-main-rotorhead-parts/analysis","conflicts":"/api/acts/ad-bo-105-17-main-rotorhead-parts/conflicts","importantCases":"/api/acts/ad-bo-105-17-main-rotorhead-parts/important-cases","documents":"/api/acts/ad-bo-105-17-main-rotorhead-parts/documents"}}