{"id":"F2007L02144","name":"AD/CL-600/74 - Horizontal Stabiliser Trim Actuator Secondary Load Path Indicator","slug":"ad-cl-600-74-horizontal-stabiliser-trim-actuator-secondary-load-path-indicator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":67322,"registerId":"commonwealth-F2007L02144-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bombardier (Canadair) CL-600 (Challenger","sectionType":"division","heading":"Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes","content":"### Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\n| AD/CL-600/74 | Horizontal Stabiliser Trim ActuatorSecondary Load Path Indicator | 8/2007 |\n| ------------ | ---------------------------------------------------------------- | ------ |\n\n| Applicability: | Model CL-600-2B19 aircraft, serial number 7003 and subsequent.                                                                                                                                                                                                                                 |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with requirements of Transport Canada AD CF-2005-04.                                                                                                                                                                                                                      |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of2 August 2007.                                                                                                                                                                                                       |\n|                | This Airworthiness Directive becomes effective on 2 August 2007.                                                                                                                                                                                                                               |\n| Background:    | This Directive mandates the introduction of a Certification Maintenance Requirement (CMR) task into the maintenance schedule; to inspect the Horizontal Stabiliser Trim Actuator (HSTA) secondary load path indicator to ensure that HSTA primary load path failure is detected and corrected. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n22 June 2007","sortOrder":0},{"sectionNumber":"AD/CL-600/74","sectionType":"part","heading":"AD/CL-600/74","content":"## AD/CL-600/74","sortOrder":1},{"sectionNumber":"Horizontal Stabiliser Trim ActuatorSecon","sectionType":"part","heading":"Horizontal Stabiliser Trim ActuatorSecondary Load Path Indicator","content":"## Horizontal Stabiliser Trim Actuator  \nSecondary Load Path Indicator","sortOrder":2},{"sectionNumber":"8/2007","sectionType":"part","heading":"8/2007","content":"## 8/2007","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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive with a single, specific safety purpose. It has not expanded beyond its original intent of mandating a specific maintenance inspection for a particular aircraft component."},"complexity_factors":["Very short document (under 300 words)","Only one substantive requirement: comply with an existing Canadian directive","Single applicability criterion (specific model and serial number range)","No defined terms section — relies on external reference to Transport Canada AD","No conditional logic or nested exceptions","Minimal cross-referencing (only to the Canadian AD CF-2005-04)"],"plain_english_summary":"This mandatory Airworthiness Directive requires operators of Bombardier Challenger CL-600-2B19 (serials 7003 onward) to add a maintenance inspection of the horizontal stabiliser trim actuator’s secondary load-path indicator. The check ensures failure of the actuator’s primary load path is clearly detected so repairs can be made before safety is compromised. It implements Transport Canada AD CF-2005-04 in Australia, effective 2 August 2007."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This Directive adopts the Transport Canada AD CF-2005-04 requirements for the specified CL-600-2B19 serials, adds a CMR inspection task and sets an effective date. It does not expand applicability beyond the stated aircraft or add obligations beyond those in the referenced Transport Canada AD."},"complexity_factors":["Narrow applicability: applies only to Model CL-600-2B19, serial 7003 and subsequent (Applicability).","Incorporation by reference: substantive inspection and compliance details are contained in Transport Canada AD CF-2005-04, not repeated here (Requirement).","Operational change: mandates insertion of a CMR task into maintenance schedules, creating planning and record-keeping work for operators and maintenance organisations (Background).","Compliance timing: revised effective date set to 2 August 2007, an administrative detail operators must meet (Compliance).","Technical execution: the task targets the HSTA secondary load-path indicator and therefore requires appropriate inspection skills and potential corrective maintenance if defects are found (Background)."],"plain_english_summary":"Requires operators of Bombardier CL-600-2B19 aircraft (serial number 7003 and subsequent) to add a Certification Maintenance Requirement (CMR) to inspect the horizontal stabiliser trim actuator (HSTA) secondary load-path indicator, in accordance with Transport Canada AD CF-2005-04. The measure is intended to ensure primary load-path failures are detected and corrected; compliance follows the referenced Transport Canada AD and takes effect 2 August 2007."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-74-horizontal-stabiliser-trim-actuator-secondary-load-path-indicator","history":"/api/acts/ad-cl-600-74-horizontal-stabiliser-trim-actuator-secondary-load-path-indicator/history","analysis":"/api/acts/ad-cl-600-74-horizontal-stabiliser-trim-actuator-secondary-load-path-indicator/analysis","conflicts":"/api/acts/ad-cl-600-74-horizontal-stabiliser-trim-actuator-secondary-load-path-indicator/conflicts","importantCases":"/api/acts/ad-cl-600-74-horizontal-stabiliser-trim-actuator-secondary-load-path-indicator/important-cases","documents":"/api/acts/ad-cl-600-74-horizontal-stabiliser-trim-actuator-secondary-load-path-indicator/documents"}}