{"id":"F2009L03825","name":"AD/CL-600/122 - Thrust Reverser Transcowl Assembly","slug":"ad-cl-600-122-thrust-reverser-transcowl-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":81063,"registerId":"commonwealth-F2009L03825-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-600/122 | Thrust Reverser Transcowl Assembly | 12/2009 |\n| ------------- | ---------------------------------- | ------- |\n\n| Applicability: | Model CL-600-2C10 aircraft, serial numbers 10003 through 10265.Model CL-600-2D15 and CL-600-2D24 aircraft, serial numbers 15001 through 15192.                                                                                                                                                                                                                                                          |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of Transport Canada AD CF-2009-33.                                                                                                                                                                                                                                                                                                                           |\n| Compliance:    | As specified in the Requirement document.                                                                                                                                                                                                                                                                                                                                                               |\n|                | This Airworthiness Directive becomes effective on 19 November 2009.                                                                                                                                                                                                                                                                                                                                     |\n| Background:    | Several cases have been reported of cracks in the joint extrusions securing the outer bondment to the acoustic panel of the nacelle transcowl assemblies. Although there is no effect on flight safety (thrust reverser stowed), thrust reverser deployment under rejected take-off or emergency landing load conditions could potentially result in acoustic panel failure and possible runway debris. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n28 September 2009","sortOrder":0},{"sectionNumber":"AD/CL-600/122","sectionType":"part","heading":"AD/CL-600/122","content":"## AD/CL-600/122","sortOrder":1},{"sectionNumber":"Thrust Reverser Transcowl Assembly","sectionType":"part","heading":"Thrust Reverser Transcowl Assembly","content":"## Thrust Reverser Transcowl Assembly","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":false,"description":"The directive's scope is aligned with its stated purpose: require inspections/repairs on specified CL-600 serials to address reported cracks in transcowl assemblies. No expansion or narrowing of applicability or requirements is indicated in the text provided."},"complexity_factors":["Cross-reference to Transport Canada AD CF-2009-33 (external normative dependency rather than full text in this instrument)","Limited applicability by specific models and serial number ranges (precision increases administrative tracking)","Technical nature of required inspections/repairs (structural crack detection and bondment repair require specialist maintenance)","Compliance timeline (effective date obliges scheduling within operators' maintenance programs)","Operational disruption risk while aircraft are grounded for inspection/repair","Regulatory enforcement by CASA delegate (administrative discretion in oversight and acceptance of compliance records)"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Bombardier CL-600 Challenger aeroplanes (listed serial numbers) to carry out the inspections and corrective actions set out in Transport Canada AD CF-2009-33. CASA issued the requirement effective 19 November 2009. It responds to reported cracks in the transcowl thrust‑reverser assembly that could permit acoustic‑panel failure and produce runway debris if a thrust reverser deployed under rejected‑takeoff or emergency‑landing loads. Operators pay for and must schedule the inspections/repairs."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: addressing a specific structural defect in specific aircraft models. It does not expand beyond its original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined applicability ranges (specific aircraft serial numbers)","Single requirement: comply with external document (Transport Canada AD CF-2009-33)","No nested conditions or exceptions","No cross-references to other Australian legislation","Straightforward causal chain: identified defect → mandatory action → compliance deadline"],"plain_english_summary":"This CASA Airworthiness Directive mandates that owners/operators of certain Bombardier Challenger CL-600 series aircraft comply with Transport Canada AD CF-2009-33 to inspect and repair cracks found in the thrust reverser transcowl assembly. It applies to specified CL-600-2C10, -2D15 and -2D24 serial ranges and requires following the Canadian instructions (compliance deadlines in that document). The issue can cause parts to break apart if reversers are deployed in an emergency, creating runway debris and compromising stopping performance; the AD took effect 19 Nov 2009."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-122-thrust-reverser-transcowl-assembly","history":"/api/acts/ad-cl-600-122-thrust-reverser-transcowl-assembly/history","analysis":"/api/acts/ad-cl-600-122-thrust-reverser-transcowl-assembly/analysis","conflicts":"/api/acts/ad-cl-600-122-thrust-reverser-transcowl-assembly/conflicts","importantCases":"/api/acts/ad-cl-600-122-thrust-reverser-transcowl-assembly/important-cases","documents":"/api/acts/ad-cl-600-122-thrust-reverser-transcowl-assembly/documents"}}