{"id":"F2006B08575","name":"AD/CL-600/15 Amdt 1 - Aileron and Elevator Flutter Dampers","slug":"ad-cl-600-15-amdt-1-aileron-and-elevator-flutter-dampers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51414,"registerId":"commonwealth-F2006B08575-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CL-600/15 Amdt 1 - Aileron and Elevator Flutter Dampers","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\nAD/CL-600/15\n\nAmdt 1\n\n  \nAileron and Elevator Flutter Dampers 6/89\n\nApplicability: All model CL 600-1A11. All model CL 600-2A12. Model CL 600-2B16 with serial numbers 5001 through 5033.\n\nRequirement: Action in accordance with Canadair Alert Wire TA 600-000-32/194 Rev 1.\n\nNote: Canadian AD CF-86-04 R1 refers.\n\nCompliance: 1. Dampers which have not previously been inspected in accordance with Alert Wire TA 600-000-32/194 Rev 1:\n\nWithin 100 hours time in service after 31 October 1986, and thereafter in accordance with 2 below.\n\n    2. Dampers which have been inspected in accordance with Alert Wire TA 600-000- 32/194 Rev 1:\n\n    Dampers P/Nos 600-75134-7 and 600-75135-3, that indicated green at the last inspection: At intervals of 200 hours time in service or 6 months, whichever occurs first.\n\n    b. Dampers P/Nos 600-75134-9 and 600-75135-5, that indicated green at the last inspection: At intervals of 300 hours time in service or 12 months, whichever occurs first.\n\n    c. Dampers P/Nos 600-75134-7 and -9, and P/Nos 600-75135-3 and -5, that indicated completely red at the last inspection: Within 100 hours time in service from the previous inspection, or 3 months, whichever occurs first.\n\nBackground: A number of aileron and elevator flutter dampers have been found to be leaking in service, which could render them unserviceable. This could permit flutter to occur in the event of the failure of any two hydraulic systems.","sortOrder":0}],"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":"As Amendment 1, the AD requires inspections per Canadair Alert Wire TA 600-000-32/194 Rev 1 and sets explicit initial and recurring inspection intervals differentiated by damper part-number and last-inspection indication; it also specifies applicability including CL-600-2B16 serial numbers 5001–5033 (see \"Requirement\", \"Compliance\" and \"Applicability\")."},"complexity_factors":["Directs compliance with an external manufacturer document rather than prescribing full procedures in the AD (\"Requirement: Action in accordance with Canadair Alert Wire TA 600-000-32/194 Rev 1\").","Different inspection intervals tied to specific part numbers and inspection outcomes (P/Ns 600-75134-7, -9 and 600-75135-3, -5 with different hour/month intervals and separate rules for 'completely red') (\"Compliance: 2(a)-(c)\").","Initial compliance deadline requires short-term scheduling (within 100 hours TIS after 31 October 1986 for non‑previously inspected dampers) which requires monitoring flight hours (\"Compliance: 1\").","Applicability narrows affected fleet to specific models and a serial-number subset for CL-600-2B16 (5001–5033), creating uneven operator impact (\"Applicability\").","Cross-reference to a foreign authority's AD (Canadian AD CF-86-04 R1) adds an extra layer of regulatory linkage (\"Note\").","Operational/administrative burden: operators must track hours-in-service and calendar intervals and act on inspection indications, and perform corrective maintenance where dampers are unserviceable (implied by Background and Compliance).","Safety rationale is technical (leaking dampers can permit flutter if two hydraulic systems fail), so compliance requires certified maintenance capability and access to spare parts or repairs (\"Background\")."],"plain_english_summary":"This airworthiness directive requires operators of specified *Bombardier CL-600 (Challenger)* aircraft to inspect aileron and elevator flutter dampers following Canadair Alert Wire TA 600-000-32/194 Rev 1, and to meet repeat inspection intervals that depend on damper part number and inspection indication. It affects operators of the listed CL-600 variants and imposes scheduled inspection, tracking and corrective-action costs to reduce the risk of flutter if two hydraulic systems fail."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 1 to an existing Airworthiness Directive. The scope remains tightly focused on the specific safety issue of flutter damper maintenance for specific CL-600 aircraft models. The amendment appears to refine inspection intervals based on part numbers and previous inspection results, but does not expand beyond the original safety purpose."},"complexity_factors":["Multiple conditional compliance paths based on inspection history (never inspected vs. previously inspected)","Nested conditions based on part numbers (P/Nos) and indicator status (green vs. red)","Cross-reference to external technical document (Canadair Alert Wire TA 600-000-32/194 Rev 1) without reproducing its contents","Reference to Canadian AD CF-86-04 R1 for additional context","Dual measurement systems for compliance intervals (flight hours OR calendar time — whichever comes first)"],"plain_english_summary":"This CASA Airworthiness Directive mandates recurring inspections of aileron and elevator flutter dampers on specified Bombardier Challenger CL-600 series jets (CL-600-1A11, CL-600-2A12 and CL-600-2B16 SN 5001–5033) after reports of hydraulic fluid leaks. Leaking dampers, combined with loss of two hydraulic systems, can allow destructive flutter; the AD requires prompt and repeated checks until a permanent corrective action is accomplished to prevent loss of control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-15-amdt-1-aileron-and-elevator-flutter-dampers","history":"/api/acts/ad-cl-600-15-amdt-1-aileron-and-elevator-flutter-dampers/history","analysis":"/api/acts/ad-cl-600-15-amdt-1-aileron-and-elevator-flutter-dampers/analysis","conflicts":"/api/acts/ad-cl-600-15-amdt-1-aileron-and-elevator-flutter-dampers/conflicts","importantCases":"/api/acts/ad-cl-600-15-amdt-1-aileron-and-elevator-flutter-dampers/important-cases","documents":"/api/acts/ad-cl-600-15-amdt-1-aileron-and-elevator-flutter-dampers/documents"}}