{"id":"F2009L03824","name":"AD/CL-600/121 - Stick Pusher Capstan Shaft","slug":"ad-cl-600-121-stick-pusher-capstan-shaft","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":81062,"registerId":"commonwealth-F2009L03824-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-600/121 | Stick Pusher Capstan Shaft | 12/2009 |\n| ------------- | -------------------------- | ------- |\n\n| Applicability: | Bombardier CL-600-2B19, serial numbers 7003 through 7990, 8000 and subsequent.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Amend the Aircraft Flight Manual (AFM) by inserting Temporary Revision (TR) RJ/178, dated 15 February 2008 or later approved revision. TR RJ/178 introduces a limitation to ensure that the Stall Protection System test is accomplished before the first flight of the day; andAdvise all flight crews on the changes introduced through the AFM TR.2. Amend the Transport Canada approved maintenance schedule by incorporating the inspection requirements of Certification Maintenance Requirement (CMR) Number C27-35-300-01, as introduced by Temporary Revision (TR) 2A-43, dated 7 May 2008, of Canadair Regional Jet Maintenance Requirements Manual, Part 2, Appendix A, “Certification Maintenance Requirements”.3. For aeroplanes with more than 5,000 flight hours at the effective date of thisAD - perform initial compliance with the new CMR task.Note: Transport Canada AD CF-2009-36 dated 2 September 2009 refers. |\n| Compliance:    | For Requirements 1 and 2 - Within 30 days of the effective date of this AD.For Requirement 3 - Within 500 flight hours after the effective date of this AD unless previously accomplished.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n|                | This Airworthiness Directive becomes effective on 19 November 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n| Background:    | There have been several Stick Pusher Capstan Shaft failures causing severe degradation of the stick pusher function. This directive is issued to revise the first flight of the day check of the stall protection system to detect degradation of the stick pusher function. It also introduces a new repetitive maintenance task to limit exposure to dormant failure of the stick pusher capstan shaft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n28 September 2009","sortOrder":0},{"sectionNumber":"AD/CL-600/121","sectionType":"part","heading":"AD/CL-600/121","content":"## AD/CL-600/121","sortOrder":1},{"sectionNumber":"Stick Pusher Capstan Shaft","sectionType":"part","heading":"Stick Pusher Capstan Shaft","content":"## Stick Pusher Capstan Shaft","sortOrder":2},{"sectionNumber":"12/2009","sectionType":"part","heading":"12/2009","content":"## 12/2009","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":true,"description":"This directive expands regulatory obligations for the specified CL-600‑2B19 fleet by converting a recommended/implicit check into a mandatory AFM requirement (pre‑flight stall protection test) and by adding a mandatory, repetitive Certification Maintenance Requirement for the stick pusher capstan shaft. It also creates an accelerated initial compliance requirement for aeroplanes with more than 5,000 flight hours, thereby broadening the set of compulsory operational and maintenance actions (Requirement 1–3; Compliance)."},"complexity_factors":["Targeted applicability by serial number narrows affected fleet but requires operators to verify serials (Applicability).","Two distinct mandatory administrative actions: AFM amendment with Temporary Revision and incorporation of a CMR inspection into the approved maintenance schedule (Requirement 1–2).","Initial compliance tied to aeroplane utilisation: separate deadline for aircraft with >5,000 flight hours (Requirement 3).","Short compliance timelines: AFM and CMR insertion within 30 days, initial CMR task within 500 flight hours (Compliance).","Operational impact on flight crews: mandatory pre‑flight Stall Protection System test and crew advisories (Requirement 1).","Maintenance burden: introduction of a recurring certification maintenance requirement increases routine inspection workload and record‑keeping (Requirement 2).","Safety‑critical hardware diagnosis: detecting dormant capstan‑shaft degradation may require specific inspections or procedures (Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Bombardier CL-600-2B19 aeroplanes (serials 7003–7990, 8000 and up) to insert a Temporary Revision into the Aircraft Flight Manual forcing a stall‑protection (stick pusher) check before the first flight of each day, and to add a recurring maintenance inspection (a CMR task) for the stick pusher capstan shaft. The changes target known capstan‑shaft failures that have degraded stick pusher function and impose short compliance windows and an initial action for aeroplanes with over 5,000 flight hours."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific mechanical failure mode in a specific aircraft type. It does not expand beyond the stick pusher capstan shaft issue described in the background."},"complexity_factors":["Single, specific aircraft type and serial number range limits applicability clearly","Only three distinct requirements with straightforward compliance timelines","References to external documents (AFM Temporary Revision RJ/178, CMR C27-35-300-01, Transport Canada AD CF-2009-36) but these are standard aviation regulatory cross-references","No nested exceptions or conditional logic — compliance dates are fixed or based on simple flight hour thresholds","Technical terminology is aircraft-specific but clearly defined in context (capstan shaft, stick pusher, CMR)","Short document length with clear tabular structure"],"plain_english_summary":"This CASA Airworthiness Directive mandates safety fixes for Bombardier CL-600-2B19 aircraft after failures of the stick‑pusher capstan shaft. Affected owners/operators must update flight manuals so crews test the stall‑protection system daily and add recurring maintenance inspections of the capstan shaft, with high‑time aircraft inspected within 500 flight hours.\n\nIt applies to CL‑600‑2B19 serials 7003–7990 and 8000+, with a 30‑day window to implement the manual/crew change."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-121-stick-pusher-capstan-shaft","history":"/api/acts/ad-cl-600-121-stick-pusher-capstan-shaft/history","analysis":"/api/acts/ad-cl-600-121-stick-pusher-capstan-shaft/analysis","conflicts":"/api/acts/ad-cl-600-121-stick-pusher-capstan-shaft/conflicts","importantCases":"/api/acts/ad-cl-600-121-stick-pusher-capstan-shaft/important-cases","documents":"/api/acts/ad-cl-600-121-stick-pusher-capstan-shaft/documents"}}