{"id":"F2009L03446","name":"AD/CL-600/80 Amdt 1 - Air Supply Duct Flanges","slug":"ad-cl-600-80-amdt-1-air-supply-duct-flanges","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":141082,"registerId":"commonwealth-F2009L03446-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-600/80 Amdt 1 | Air Supply Duct Flanges | 10/2009 |\n| ------------------- | ----------------------- | ------- |\n\n| Applicability: | Bombardier Inc. Model CL-600-2B19 aircraft, serial number 7003 through 7477.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with Transport Canada AD CF-2003-05R2.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n| Compliance:    | As detailed in Transport Canada AD CF-2003-05R2 with a revised effective date of 24 September 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |\n|                | This Amendment becomes effective on 24 September 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| Background:    | The manufacturing procedure used to attach the flanges to the air supply ducts has resulted in bonds that may lose shear strength at elevated temperatures. This condition could potentially cause the duct to disconnect and in combination with the failure of a bulkhead check valve, result in the in-flight loss of aircraft pressurization.Part A of Transport Canada, mandated by the original issue of this AD has been superseded by Transport Canada AD 2009-31. This AD retains the remaining parts of Transport Canada AD 2003-05R1.The original issue of this AD became effective on 30 August 2007. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n14 August 2009","sortOrder":0},{"sectionNumber":"AD/CL-600/80 Amdt 1","sectionType":"part","heading":"AD/CL-600/80 Amdt 1","content":"## AD/CL-600/80 Amdt 1","sortOrder":1},{"sectionNumber":"Air Supply Duct Flanges","sectionType":"part","heading":"Air Supply Duct Flanges","content":"## Air Supply Duct Flanges","sortOrder":2},{"sectionNumber":"10/2009","sectionType":"part","heading":"10/2009","content":"## 10/2009","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Scope changed from the original issue: Part A of the original AD has been superseded by Transport Canada AD 2009-31, while the remaining parts of Transport Canada AD CF-2003-05R1 are retained. The amendment updates the effective date to 24 September 2009 and preserves continuing obligations for the listed serial-number range."},"complexity_factors":["Cross-reference to an external mandatory document: action must be taken in accordance with Transport Canada AD CF-2003-05R2 (Requirement).","Narrow applicability: affects a specific model and serial-number range (CL-600-2B19, s/n 7003–7477) (Applicability).","Technical cause and operational risk: manufacturing bond defects that lose shear strength at elevated temperatures, potentially causing duct separation and pressurization loss (Background).","Amendment history and interplay with other ADs: Part A of the original AD was superseded by Transport Canada AD 2009-31 while other parts are retained, creating layered compliance obligations (Background).","Revised effective date: the AD sets a specific revised effective date (24 September 2009) which affects timing for compliance (Compliance)."],"plain_english_summary":"This amendment requires Bombardier CL-600-2B19 aircraft (serials 7003–7477) to follow Transport Canada AD CF-2003-05R2 procedures to address air-supply duct flange bonds that can lose shear strength at elevated temperatures. It becomes effective 24 September 2009. The AD retains the remaining parts of the earlier Transport Canada AD while Part A was superseded by Transport Canada AD 2009-31. It matters because degraded bonds could allow a duct to disconnect and, with a failed bulkhead check valve, risk in‑flight loss of pressurization."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard amendment to an existing Airworthiness Directive. It updates the effective date and incorporates a revised Canadian directive while maintaining the original safety purpose (addressing defective air duct flanges). The scope remains tightly focused on the specific aircraft model and the specific mechanical defect."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 1 defined applicability criterion (specific aircraft serial number range)","No nested conditional logic or exceptions — single straightforward requirement to follow another document","No internal cross-references beyond referring to external Transport Canada directive","Simple linear structure: applicability → requirement → compliance date → background explanation"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of Bombardier Challenger CL-600-2B19 aircraft (S/N 7003–7477) to comply with Transport Canada AD CF-2003-05R2 addressing potentially weak air supply duct flanges. The manufacturing bond can fail at high temperatures, risking duct separation and, if a backup valve also fails, in‑flight loss of cabin pressure. Compliance is mandatory from 24 September 2009 and affects operators and maintenance personnel."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-80-amdt-1-air-supply-duct-flanges","history":"/api/acts/ad-cl-600-80-amdt-1-air-supply-duct-flanges/history","analysis":"/api/acts/ad-cl-600-80-amdt-1-air-supply-duct-flanges/analysis","conflicts":"/api/acts/ad-cl-600-80-amdt-1-air-supply-duct-flanges/conflicts","importantCases":"/api/acts/ad-cl-600-80-amdt-1-air-supply-duct-flanges/important-cases","documents":"/api/acts/ad-cl-600-80-amdt-1-air-supply-duct-flanges/documents"}}