{"id":"F2006B08607","name":"AD/CL-600/45 - Engine Support Beam","slug":"ad-cl-600-45-engine-support-beam","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51521,"registerId":"commonwealth-F2006B08607-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nBombardier (Canadair) CL-600 (Challenger) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/CL-600/45 Engine Support Beam 11/2001","sectionType":"part","heading":"AD/CL-600/45 Engine Support Beam 11/2001","content":"# AD/CL-600/45 Engine Support Beam 11/2001\n\nApplicability: Model CL-600-2B19 aircraft, serial numbers 7003 through 7999.\n\nRequirement: Perform a detailed visual inspection in accordance with Part 2 of the Accomplishment Instructions of Bombardier Alert Service Bulletin A601R-53-059, dated 14 June 2001.\n\nIf cracks are found, repair before further flight. Contact Bombardier Aerospace for approved repair instructions.\n\nNote: Transport Canada AD CF-2001-26 refers.\n\nCompliance: For aircraft that have accumulated 7,500 or less total flight cycles at 1 November 2001, accomplish before exceeding 8,000 total flight cycles.\n\nFor aircraft that have accumulated more than 7,500 total flight cycles but less than 11,750 total flight cycles at 1 November 2001, accomplish within 500 flight cycles after 1 November 2001 or before 12,000 total flight cycles, whichever occurs first.\n\nFor aircraft that have accumulated more than 11,750 total flight cycles at 1 November 2001, accomplish within 250 flight cycles after 1 November 2001.\n\nThereafter, repeat the inspection at intervals not to exceed 740 flight cycles. This Airworthiness Directive becomes effective on 1 November 2001.\n\nBackground: Cracks have been found on the upper and lower web of the engine support beam at fuselage station 640 on several high time aircraft in service. Consequential failure of the engine support beam, which is a principal structural element, could possibly affect the structural integrity of the aircraft.\n\n![Signature of David Alan Villiers Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nDavid Alan Villiers\n\n![](image.001.png)Delegate of the Civil Aviation Safety Authority 19 September 2001","sortOrder":1}],"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":4,"scope_assessment":{"changed":false,"description":"The AD implements inspection and repair measures targeted at CL-600‑2B19 aircraft s/n 7003–7999 to address discovered cracks in the engine support beam (Applicability; Requirement; Background). It does not expand beyond that serial‑number range or introduce additional structural elements to inspect, so the scope aligns with the stated safety concern and original corrective intent."},"complexity_factors":["Multiple flight‑cycle thresholds with different compliance windows (Compliance) increase tracking and scheduling complexity.","Mandated use of a specific manufacturer Alert Service Bulletin for inspection procedures (Requirement) creates dependency on external technical instructions.","Requirement to obtain Bombardier‑approved repair instructions if cracks are found (Requirement) adds administrative steps and potential downtime.","Recurring inspection interval (every 740 flight cycles) imposes ongoing compliance burden.","Applicability limited to a serial‑number range (Applicability) narrows scope but requires fleet‑level record checks."],"plain_english_summary":"Mandates detailed visual inspections of the engine support beam on Bombardier CL-600‑2B19 aeroplanes, serial numbers 7003–7999, using Bombardier Alert Service Bulletin A601R‑53‑059; any cracks must be repaired before further flight and repairs must follow Bombardier‑approved instructions (Requirement). Compliance deadlines depend on total flight cycles as of 1 November 2001, with recurring inspections every 740 flight cycles, and the AD responds to discovered cracks that could affect structural integrity (Compliance; Background).\n\nThe inspection and repair costs and operational disruption fall to aircraft operators; approved repair instructions require contacting the manufacturer (Requirement)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific structural defect in a specific aircraft model. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, clearly defined applicability (one aircraft model, specific serial number range)","Straightforward conditional compliance structure based on three flight cycle thresholds","Single technical requirement referencing an external manufacturer document (Service Bulletin)","No nested definitions or extensive interpretation sections","Clear binary outcome (cracks found = repair before flight; no cracks = continue with recurring inspections)","Minimal cross-referencing (only one reference to Canadian Transport Canada AD)"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections of the engine support beam on Bombardier Challenger CL-600-2B19 aircraft (S/N 7003–7999) using Bombardier's service instructions. If cracks are found the aircraft is grounded until approved repairs are done.\n\nIt affects operators of those Challengers, with inspection timing tied to an aircraft's flight-cycle history and repeat checks required (every 740 cycles), aiming to detect fatigue before failure that could cause structural damage or an accident."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-45-engine-support-beam","history":"/api/acts/ad-cl-600-45-engine-support-beam/history","analysis":"/api/acts/ad-cl-600-45-engine-support-beam/analysis","conflicts":"/api/acts/ad-cl-600-45-engine-support-beam/conflicts","importantCases":"/api/acts/ad-cl-600-45-engine-support-beam/important-cases","documents":"/api/acts/ad-cl-600-45-engine-support-beam/documents"}}