{"id":"F2009L03390","name":"AD/CL-600/119 Amdt 1 - Power Control Unit Rod Centering Mechanism","slug":"ad-cl-600-119-amdt-1-power-control-unit-rod-centering-mechanism","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":140975,"registerId":"commonwealth-F2009L03390-current","compilationNumber":null,"startDate":"2026-04-03","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-600/119 Amdt 1 | Power Control Unit Rod Centering Mechanism | 11/2009 DM |\n| -------------------- | ------------------------------------------ | ---------- |\n\n| Applicability: | Bombardier Inc. Models:CL-600-2C10, serial numbers 10003 to 10259.CL-600-2D15 and CL-600-2D24, serial numbers 15001 to 15099.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Install the new Elevator Power Control Unit (PCU) centering mechanism in accordance with Accomplishment Instructions in Part 2 of Bombardier Aerospace Service Bulletin 670BA-27-042, Revision B, dated 2 June 2009, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.Incorporation of Bombardier Aerospace Service Bulletin 670BA-27-042, Original Issue, dated 14 October 2008, or Revision A, dated 8 January 2009, meets the intent of this AD only if Bombardier Aerospace Repair Engineering Order (REO)670-27-31-001, or Service Non-Incorporated Engineering Order (SNIEO) S01 or S02 from kit drawing KBA670-93702 is also incorporated at the same time.Note: Transport Canada AD CF-2009-28R1 dated 14 August 2009 refers. |\n| Compliance:    | Within 6,000 flight hours after the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n|                | This Amendment becomes effective on 24 September 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n| Background:    | During a PCU Centering Functional Check on two CL-600-2C10 aircraft, sustained oscillations were discovered when a control rod was disconnected. These sustained oscillations could render the elevator surface inoperable and cause subsequent loss of pitch control of the aircraft.This AD mandates incorporation of a new centering mechanism on the elevator torque tube to prevent these sustained oscillations.This amendment corrects date of Revision B of the referenced SB.                                                                                                                                                                                                                                                                                    |\n\n|     | The original issue of this AD becomes effective 24 September 2009. |\n| --- | ------------------------------------------------------------------ |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n2 September 2009","sortOrder":0},{"sectionNumber":"AD/CL-600/119 Amdt 1","sectionType":"part","heading":"AD/CL-600/119 Amdt 1","content":"## AD/CL-600/119 Amdt 1","sortOrder":1},{"sectionNumber":"Power Control Unit Rod Centering Mechani","sectionType":"part","heading":"Power Control Unit Rod Centering Mechanism","content":"## Power Control Unit Rod Centering Mechanism","sortOrder":2},{"sectionNumber":"11/2009 DM","sectionType":"part","heading":"11/2009 DM","content":"## 11/2009 DM","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive. The amendment is narrow and technical — it corrects only the date of Revision B of the referenced Service Bulletin (from an incorrect date to 2 June 2009). The scope remains identical to the original AD: mandating installation of a specific safety modification to prevent elevator control oscillations. No expansion of applicability, requirements, or intent."},"complexity_factors":["Single, specific technical requirement with clear reference to manufacturer service bulletin","Limited applicability to specific aircraft models and serial number ranges (3 model variants, defined serial ranges)","One main compliance pathway with two alternative historical compliance options (Original Issue or Revision A of SB) requiring additional engineering orders","Simple time-based compliance (6,000 flight hours)","Cross-reference to Canadian Transport Canada AD CF-2009-28R1 for context","No nested exceptions or conditional logic — amendment simply corrects a date error in the referenced document"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of specified Bombardier Challenger CL-600-2C10/2D15/2D24 serial ranges to install a centering mechanism on the elevator power control unit per Bombardier Service Bulletin 670BA-27-042 (or later). The retrofit, required within 6,000 flight hours from the AD’s effective date, prevents elevator sustained oscillations that could cause loss of pitch control."},"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 amendment corrects the date of Revision B of the referenced Bombardier Service Bulletin. It does not alter the AD's technical requirement to install the new PCU centering mechanism, the specified applicability (models/serial numbers), or the compliance time of 6,000 flight hours; the original AD effective date remains 24 September 2009."},"complexity_factors":["Applicability limited to specific models and serial-number ranges (CL-600-2C10 SN 10003–10259; CL-600-2D15 and -2D24 SN 15001–15099) — requires precise fleet identification.","Mandated work must follow Bombardier Service Bulletin 670BA-27-042 Revision B or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada — creates dependency on external document and regulator approval.","Alternative compliance path: Original issue or Revision A meet intent only if Bombardier Repair Engineering Order (REO) 670-27-31-001 or Service Non-Incorporated Engineering Order (SNIEO) S01/S02 from kit drawing KBA670-93702 is incorporated simultaneously — adds conditionality to acceptable methods.","Compliance measured in flight hours (6,000 FH) rather than calendar days — scheduling and tracking burden for operators.","Safety-critical flight-control hardware change with potential need for parts/kits and maintenance-line engineering input.","Amendment scope limited to correcting the referenced Service Bulletin date — minimal substantive change but requires users to reconcile document revisions."],"plain_english_summary":"Requires operators of specified Bombardier CL-600 Challenger aeroplanes (listed serial numbers) to install a redesigned elevator Power Control Unit (PCU) centering mechanism following Bombardier Service Bulletin 670BA-27-042 (Revision B or later Transport Canada–approved revisions). The change mechanically fits a new centering device to the elevator torque tube to prevent sustained control-rod oscillations that could lead to loss of pitch control. Compliance is required within 6,000 flight hours; operators pay for parts and installation and must use Transport Canada–approved revisions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-119-amdt-1-power-control-unit-rod-centering-mechanism","history":"/api/acts/ad-cl-600-119-amdt-1-power-control-unit-rod-centering-mechanism/history","analysis":"/api/acts/ad-cl-600-119-amdt-1-power-control-unit-rod-centering-mechanism/analysis","conflicts":"/api/acts/ad-cl-600-119-amdt-1-power-control-unit-rod-centering-mechanism/conflicts","importantCases":"/api/acts/ad-cl-600-119-amdt-1-power-control-unit-rod-centering-mechanism/important-cases","documents":"/api/acts/ad-cl-600-119-amdt-1-power-control-unit-rod-centering-mechanism/documents"}}