{"id":"F2006B08583","name":"AD/CL-600/23 Amdt 1 - Brakes","slug":"ad-cl-600-23-amdt-1-brakes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51431,"registerId":"commonwealth-F2006B08583-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CL-600/23 Amdt 1 - Brakes","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-600/23\n\nAmdt 1\n\n  \nBrakes 12/98\n\nApplicability: Model CL-600-1A11, serial numbers 1004 through 1066, and 1068 through 1085; and Model CL-600-2A12, serial numbers 3001 through 3050.\n\nRequirement: To reduce the possibility of frozen brakes, install inboard wheel discs, water shields, water deflectors and, for CL-600-2A12 aircraft, trailing arm sealing caps:\n\nFor CL-600-1A11 aircraft:\n\nAction in accordance with Canadair Service Bulletin (SB) 600-0369 Revision 3.\n\nFor CL-600-2A12 aircraft:\n\nAction in accordance with Canadair SB 601-0024 Revision 2.\n\nIt is permissible to remove the inboard and/or outboard wheel discs, provided the aircraft does not take off from a wet runway where the ambient temperature is below 10 degrees C. The Aircraft Flight Manual Limitations section (Configuration Deviation List) refers. Removal and reinstallation of discs shall be done in accordance with the following:\n\nFor CL-600-1A11 aircraft:\n\nCanadair Drawing K600-85022, or SB 600-0662.\n\nFor CL-600-2A12 aircraft:\n\nCanadair Drawing K600-85022, or SB 601-0467.\n\nNote: Transport Canada AD CF-84-04R2 refers.\n\nCompliance: Unless already accomplished, within 300 hours time in service after 5 November 1998.\n\nThis Amendment becomes effective on 5 November 1998.\n\nBackground: Tyre burst on landing occurred on a number of aircraft when operating from contaminated surfaces.\n\nAmendment 1 is issued in response to a revision of the related Transport Canada AD, which introduces disc removal and reinstallation requirement documents.\n\nThe original issue of this Airworthiness Directive became effective on 20 August 1992.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original 1992 directive mandated permanent installation of brake protection hardware. Amendment 1 (1998) significantly expanded scope by introducing a conditional removal/reinstallation regime—effectively creating a 'part-time' compliance option that didn't exist originally. This transformed a simple installation mandate into a complex operational flexibility framework with ongoing maintenance documentation requirements."},"complexity_factors":["Multiple conditional pathways: two aircraft models with distinct compliance documents (SB 600-0369 vs SB 601-0024)","Nested permission structure: exemption allowing disc removal contingent on operational restriction (wet runway + temperature threshold) plus cross-reference to Aircraft Flight Manual","Dual compliance pathways for removal/reinstallation: two approved document options per aircraft model","External document dependencies: references to Transport Canada AD, multiple Service Bulletins, technical drawings, and Flight Manual sections not reproduced in text","Time-bound compliance with retrospective element ('unless already accomplished')"],"plain_english_summary":"This safety order for specific Bombardier Challenger CL-600 series jets mandates installation of revised brake wheel discs, shields and deflectors to stop brake freezing on wet, cold runways. It affects operators of certain 1980s-era serial-numbered Challengers and is intended to prevent brake-induced tyre explosions on landing. The amendment also creates a temporary exemption allowing removal of the protective discs if operators avoid wet takeoffs below 10°C and follow specified reinstallation requirements."},"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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 adds explicit requirement documents for removal and reinstallation of wheel discs (references to Canadair drawings/SBs), while preserving the original directive to install inboard discs, water shields and deflectors (and sealing caps for CL-600-2A12). The affected models/serial ranges and the 300-hour compliance deadline remain the same; the change introduces procedures and permissible operational conditions for disc removal."},"complexity_factors":["Applicability limited to specific models and serial-number ranges (clear but requires fleet filtering)","Model-specific mandatory actions with different service bulletin revisions (Requirement: Canadair SB 600-0369 Rev 3; SB 601-0024 Rev 2)","Permissive but conditional removal of wheel discs tied to an operational restriction (no takeoff from wet runway when ambient <10°C)","Dependence on external technical documents for installation/removal/reinstallation (service bulletins and Canadair drawings K600-85022 or named SBs)","Compliance deadline expressed as hours time-in-service after an effective date (300 hours after 5 November 1998)","Cross-reference to Aircraft Flight Manual Configuration Deviation List for limitation handling","Amendment introduces additional procedural documents for disc removal/reinstallation (adds administrative layering)"],"plain_english_summary":"Requires operators of Bombardier CL-600-1A11 (s/n 1004–1066, 1068–1085) and CL-600-2A12 (s/n 3001–3050) to install inboard wheel discs, water shields and water deflectors — and trailing arm sealing caps on CL-600-2A12 — to reduce the possibility of frozen brakes. The AD allows removal of wheel discs provided the aircraft does not take off from a wet runway below 10°C and requires compliance within 300 hours time in service after 5 November 1998, using the specified Canadair service bulletins or drawings."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-23-amdt-1-brakes","history":"/api/acts/ad-cl-600-23-amdt-1-brakes/history","analysis":"/api/acts/ad-cl-600-23-amdt-1-brakes/analysis","conflicts":"/api/acts/ad-cl-600-23-amdt-1-brakes/conflicts","importantCases":"/api/acts/ad-cl-600-23-amdt-1-brakes/important-cases","documents":"/api/acts/ad-cl-600-23-amdt-1-brakes/documents"}}