{"id":"F2007L02123","name":"AD/CL-600/72 - Thrust Reverser Casades Configuration","slug":"ad-cl-600-72-thrust-reverser-casades-configuration","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":67257,"registerId":"commonwealth-F2007L02123-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-600/72 | Thrust Reverser Cascades Configuration | 8/2007 |\n| ------------ | -------------------------------------- | ------ |\n\n| Applicability: | CL-600-2C10 Regional Jet Series 700 Aircraft, Serial Numbers 10003 to 10116 inclusive.Note 1: Aircraft serial numbers 10002, 10117 and subsequent will have Service Bulletin No. 670BA-78-003 incorporated by Bombardier before initial delivery.                                                                                                                                                                                                                                                                                                                                      |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. For CL-600-2C10 Regional Jet Series 700 Aircraft Serial Numbers 10005 through 100040:Perform an inspection of the thrust reverser cascades configuration, and correct the cascades installation if required, in accordance with Bombardier Alert SB A670BA-78-001, Revision A, dated 23 April 2002, or later NAA approved revisions.2. For all CL-600-2C10 Regional Jet Series 700 Aircraft, inspect the thrust reverser cascades configuration in accordance with Bombardier Alert SB A670BA-78-001 Revision A.Note 2: Transport Canada AD CF-2002-30R1 dated 22 June 2004 refers. |\n| Compliance:    | 1. Within 72 flight hours or 30 days following the effective date of this AD, whichever occurs first.2. Each time the thrust reverser cascade assemblies are changed.                                                                                                                                                                                                                                                                                                                                                                                                                  |\n|                | This Airworthiness Directive becomes effective on 2 August 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n| Background:    | An incident occurred during a pre-delivery flight where upon landing and application of maximum thrust reverser, the aircraft veered to the right from the runway heading.The investigation determined that the thrust reverser cascades configuration on the left engine was incorrect. The cascades have different part numbers to control the correct installation location; however, it is physically possible that diagonally opposed cascades can be intermixed.                                                                                                                 |\n\n|     | Bombardier has issued Alert Service Bulletin (SB) A670BA-78-001 to introduce an inspection and to confirm the proper installation of the thrust reverser cascades. |\n| --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n\n![](image.001.png)  \nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n21 June 2007","sortOrder":0},{"sectionNumber":"AD/CL-600/72","sectionType":"part","heading":"AD/CL-600/72","content":"## AD/CL-600/72","sortOrder":1},{"sectionNumber":"Thrust Reverser Cascades Configuration","sectionType":"part","heading":"Thrust Reverser Cascades Configuration","content":"## Thrust Reverser Cascades Configuration","sortOrder":2},{"sectionNumber":"8/2007","sectionType":"part","heading":"8/2007","content":"## 8/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"The instrument's intended scope is unclear because the Applicability paragraph limits affected aircraft to serial numbers 10003–10116, while Requirement 1 cites serial numbers '10005 through 100040'. This discrepancy appears to expand or misstate scope beyond the Applicability range and therefore changes or obscures the original intended population of affected aircraft. The AD also notes some serial numbers will have the SB incorporated before delivery, further differentiating in‑service obligations."},"complexity_factors":["Ambiguous serial number ranges: Applicability states serial numbers 10003–10116, but Requirement 1 refers to serial numbers '10005 through 100040', creating uncertainty about which aircraft are in scope.","Multiple compliance triggers and timing: initial inspection required within 72 flight hours OR 30 days, plus mandatory inspection whenever cascade assemblies are changed (ongoing compliance burden).","Dependence on external documents: requires compliance with Bombardier Alert SB A670BA-78-001 Revision A or later NAA‑approved revisions, placing interpretative reliance on the Service Bulletin and any later national authority approvals.","Cross-reference to another authority: cites Transport Canada AD CF-2002-30R1, introducing potential cross-jurisdictional differences in acceptable revisions or interpretations.","Technical source of risk: physical interchangeability of diagonally opposed cascade parts despite different part numbers increases inspection complexity and error risk during maintenance.","Operational impact concentrated on operators and MROs: inspections and corrective work are the direct cost and execution responsibility of aircraft operators/maintenance organisations.","Pre-modification note: certain serial numbers (10002, 10117 and subsequent) may have the SB incorporated before delivery, requiring verification of production status on individual aircraft."],"plain_english_summary":"This Airworthiness Directive requires operators of certain Bombardier CL-600-2C10 Series 700 aircraft to inspect the thrust reverser cascade installation and fix any incorrect installations following Bombardier Alert Service Bulletin A670BA-78-001 (or later NAA‑approved revisions). Inspections must occur within 72 flight hours or 30 days of the AD and each time cascade assemblies are changed. It affects aircraft operators and maintenance organisations, who must carry out and pay for the inspections and any corrective work to address a configuration fault that can cause directional control loss on landing."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific mechanical installation error on a specific aircraft model. It has not expanded beyond the original safety issue identified in the 2002 Bombardier service bulletin and the referenced Canadian airworthiness directive."},"complexity_factors":["Very short document (approximately 300 words)","Only 2 main requirements with clear conditional logic (serial number ranges)","Minimal defined terms — only standard aviation terminology (AD, SB, NAA)","Single cross-reference to a Canadian Transport Canada AD (CF-2002-30R1)","Clear compliance timeframe with simple alternative triggers (flight hours OR days)","Straightforward applicability section with explicit serial number ranges and one exemption note"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection—and correction if needed—of engine thrust reverser cascade assemblies on certain Bombardier CL-600-2C10 Series 700 (Challenger) aircraft (serials 10003–10116; some newer serials were corrected at the factory). \n\nIncorrect cascade installation can cause asymmetric braking and runway excursions; operators must inspect within 72 flight hours or 30 days and correct per Bombardier guidance, and repeat whenever cascade assemblies are replaced."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-72-thrust-reverser-casades-configuration","history":"/api/acts/ad-cl-600-72-thrust-reverser-casades-configuration/history","analysis":"/api/acts/ad-cl-600-72-thrust-reverser-casades-configuration/analysis","conflicts":"/api/acts/ad-cl-600-72-thrust-reverser-casades-configuration/conflicts","importantCases":"/api/acts/ad-cl-600-72-thrust-reverser-casades-configuration/important-cases","documents":"/api/acts/ad-cl-600-72-thrust-reverser-casades-configuration/documents"}}