{"id":"F2006B08587","name":"AD/CL-600/27 Amdt 1 - Rudder Control Quadrant","slug":"ad-cl-600-27-amdt-1-rudder-control-quadrant","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51442,"registerId":"commonwealth-F2006B08587-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CL-600/27 Amdt 1 - Rudder Control Quadrant","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\n| AD/CL-600/27Amdt 1   | Rudder Control Quadrant | 3/95DM |\n| -------------------- | ----------------------- | ------ |\n| Applicability: MODEL | SERIAL NUMBER           |        |\n| CL-600-1A11          | 1004 through 1085       |        |\n| CL-600-2A12          | 3001 through 3066       |        |\n| CL-600-2B16          | 5001 through 5147       |        |\n| CL-600-2B19          | 7003 through 7038       |        |\n\nRequirement: 1. Perform an ultrasonic inspection of the rudder quadrant, part number 600-92614-1 (original quadrant) or 600-92614-3 (quadrant modified with undercut), for cracks at the inside root radius of the spigot in accordance with the following service bulletins:\n\n    For CL-600-1A11, \\-2A12 and \\-2B16 aircraft: Accomplishment Instructions Part A of the applicable Canadair Challenger Service Bulletins 600-0637 Revision 1 or 601-0426 Revision 1.\n\n    b. For CL-600-2B19 aircraft: Accomplishment Instructions of Canadair Regional Jet Alert Service Bulletin A601R-27-011 Revision A.\n\nAlternatively, the above inspection may be performed with the fluorescent penetrant method if the quadrant assembly is first removed from the aircraft.\n\nIf cracks are found in the quadrant, modify the rudder quadrant assembly in accordance with Requirement 2 of this Directive.\n\nNote: Rudder quadrants, part number 600-92614-1 and 600-92614-3, are part of rudder quadrant assemblies, part number 600-92619-1 and 600-62619-5, respectively.\n\n    2. Modify the rudder quadrant assembly, part number 600-92619-1 or 600-92619-5, in accordance with the following service bulletins:\n\n    For CL-600-1A11, -2A12 and -2B16 aircraft: Accomplishment Instructions Part B of the applicable Canadair Service Bulletin 600-0637 Revision 1 or 601- 0426 Revision 1.\n\n    b. For CL-600-2B19 aircraft: Accomplishment Instructions of Canadair Regional Jet Service Bulletin 601R-27-015 Revision A.\n\nNote: Transport Canada AD CF-94-23 refers.\n\nCompliance: 1. Unless Requirement 2 is already accomplished, prior to 28 February 1995.\n\n2. Prior to 30 June 1995.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\nBackground: There has been one instance of an in-flight failure of a rudder control quadrant P/N 600-92614-1. The failure was caused by stress corrosion cracking and resulted in partial loss of rudder control. Amendment 1 is issued to introduce modification action as required by Transport Canada.","sortOrder":0}],"analysis":{"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":"Scope was expanded by Amendment 1: the directive adds a mandatory modification requirement to the earlier inspection action. The AD now requires initial inspection for cracks (Requirement 1) and, where cracks are found, modification of the rudder quadrant assembly per the applicable service bulletins (Requirement 2). The amendment explicitly introduces the modification action as required by Transport Canada and sets specific compliance deadlines for inspection and modification."},"complexity_factors":["Multiple affected aircraft models and serial number ranges (Applicability) increase tracking and record-keeping burden.","Two inspection methods permitted: ultrasonic in situ or fluorescent penetrant if assembly is removed (Requirement 1) — technical capability and labour vary by method.","Mandatory modification if cracks found (Requirement 2) ties corrective action to service bulletin procedures, creating dependency on manufacturer documentation.","Different service bulletin references by model (600-0637/601-0426 for some models; A601R-27-011/A601R-27-015 for others) adds administrative complexity.","Parts/assembly numbering: quadrant PN versus assembly PN distinction and notes require correct parts identification before action.","Fixed compliance deadlines (inspection prior to 28 Feb 1995 unless already modified; modification prior to 30 Jun 1995) create scheduling and operational disruption risk.","Reference to Transport Canada AD CF-94-23 (Background) implies inter-jurisdictional coordination and reliance on foreign-issued corrective action."],"plain_english_summary":"Requires operators of specified Bombardier CL-600 series aeroplanes (listed by model and serial range) to inspect the rudder control quadrant (PN 600-92614-1 or -3) for cracks using ultrasonic inspection (or fluorescent penetrant if removed) and to modify the quadrant assembly (PN 600-92619-1 or -5) per Canadair/Regional Jet service bulletins where cracks are found. The Civil Aviation Safety Authority sets deadlines for inspection and modification; aircraft owners/operators pay for and arrange the inspections and required modifications."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of the airworthiness directive. Amendment 1 adds the modification requirement (Requirement 2) that was mandated by Transport Canada, but this is a logical extension of the original safety action rather than scope creep. The directive remains tightly focused on the specific rudder quadrant defect across the identified aircraft fleet."},"complexity_factors":["Multiple aircraft variants with different service bulletin references (four model types requiring two different sets of instructions)","Cross-references to external manufacturer documents (Canadair Service Bulletins) that are not reproduced in the directive itself","Conditional logic: alternative inspection method permitted only if quadrant is removed first","Nested part number relationships (quadrant part numbers vs. assembly part numbers) explained in notes","Reference to foreign aviation authority (Transport Canada AD CF-94-23) for additional context"],"plain_english_summary":"This urgent safety order requires owners and operators of listed Bombardier CL-600 series Challenger and Regional Jet aircraft to inspect the rudder control quadrant for stress-corrosion cracks and to modify it if cracking is found. Inspections must be done ultrasonically (or by fluorescent dye if the assembly is removed), with compliance deadlines set in 1995. It follows an in‑flight partial rudder failure and aims to prevent loss of directional control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-27-amdt-1-rudder-control-quadrant","history":"/api/acts/ad-cl-600-27-amdt-1-rudder-control-quadrant/history","analysis":"/api/acts/ad-cl-600-27-amdt-1-rudder-control-quadrant/analysis","conflicts":"/api/acts/ad-cl-600-27-amdt-1-rudder-control-quadrant/conflicts","importantCases":"/api/acts/ad-cl-600-27-amdt-1-rudder-control-quadrant/important-cases","documents":"/api/acts/ad-cl-600-27-amdt-1-rudder-control-quadrant/documents"}}