{"id":"F2006B08585","name":"AD/CL-600/25 Amdt 1 - Throttle Quadrant","slug":"ad-cl-600-25-amdt-1-throttle-quadrant","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51438,"registerId":"commonwealth-F2006B08585-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CL-600/25 Amdt 1 - Throttle 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\nAD/CL-600/25\n\nAmdt 1\n\n  \nThrottle Quadrant 7/94\n\nApplicability: Model CL-600 aircraft with serial numbers, and with throttle quadrant part numbers listed in the Requirement Document.\n\nRequirement: Action in accordance with the technical requirements of Transport Canada AD CF-92-23R1.\n\nNote: Canadair Challenger ASB A600-0615, ASB A601-0374 Revision 1, SB 600-0629, and SB 601-0410 refer.\n\nCompliance: As specified in the Requirement Document with a revised effective date of 23 June 1994.\n\nBackground: A report had been received of unintentional engine shut-down in flight. This shut- down resulted from the throttle lever overriding the idle stop, during throttle retardation, and moving into the shut-off position. Amendment 1 is issued in response to a revision of the Requirement Document which requires an additional fault detection check and another modification to the aircraft throttle quadrant.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical safety directive focused on a specific mechanical defect in a specific aircraft type. Amendment 1 slightly expands the original requirements by adding a fault detection check and additional modification, but this is consistent with the original safety purpose — preventing inadvertent engine shutdown. No scope creep beyond aviation safety maintenance."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined applicability criterion (specific aircraft models/serial numbers)","Single requirement: comply with external Transport Canada directive","No nested exceptions or conditional logic","Cross-references are simple citations to external technical documents rather than legislative cross-references","Plain language background explanation included"],"plain_english_summary":"This is an **Airworthiness Directive** — essentially a mandatory safety order for aircraft owners and operators. It applies to specific **Bombardier Challenger CL-600 series aircraft** (business jets) that have certain throttle quadrant part numbers.\n\n**What it does:**\n- Requires owners to inspect and modify the **throttle quadrant** — the cockpit control that manages engine power\n- The fix addresses a dangerous fault where the throttle lever could accidentally slip past the \"idle\" position and shut off the engine in flight\n- Amendment 1 adds extra steps: a **fault detection check** and an **additional modification** to the throttle mechanism\n\n**Who must comply:**\n- Operators of affected CL-600 aircraft with specific serial numbers and throttle part numbers listed in the technical document (Transport Canada AD CF-92-23R1)\n\n**Why it matters:**\n- An unintentional engine shutdown during flight is a serious safety risk. This directive prevents that by ensuring the throttle can't accidentally move into the fuel cut-off position when pilots are simply reducing power.\n\n**Key technical references:**\n- Transport Canada AD CF-92-23R1 (the master technical requirement)\n- Canadair Service Bulletins: ASB A600-0615, ASB A601-0374 Rev 1, SB 600-0629, SB 601-0410"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"Amendment 1 expands the original Requirements by adding an additional fault-detection check and an additional modification to the throttle quadrant. The Background explicitly states Amendment 1 was issued in response to a revision of the Requirement Document that requires these extra actions, thereby broadening the technical tasks operators must perform under the AD. (Background; Requirement)"},"complexity_factors":["Cross-reference to an external Transport Canada AD (CF-92-23R1) for the detailed technical requirements (Requirement).","Delegation of procedural detail to a Requirement Document that lists specific serial numbers and part numbers but is not reproduced in the AD (Applicability; Requirement).","Multiple related service documents referenced (ASBs and SBs) that operators must consult to complete compliance tasks (Note).","Amendment 1 adds further technical actions (an additional fault-detection check and another modification), increasing steps operators must follow (Background).","Compliance is anchored to a revised effective date, requiring operators to track timing and possibly retrofit aircraft within a set schedule (Compliance).","Regulatory enforcement is clear but the AD’s reliance on external documents creates operational dependency and potential for implementation delays (Requirement; Note)."],"plain_english_summary":"This AD requires specified Bombardier CL‑600 (Challenger) aeroplanes to have their throttle quadrants inspected and modified per Transport Canada AD CF‑92‑23R1 and its Requirement Document. Amendment 1 adds an extra fault‑detection check and an additional modification. It affects owners, operators and maintenance organisations responsible for listed aircraft/parts, aims to prevent unintended in‑flight engine shutdown, and places inspection/modification costs, downtime and compliance burden on operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-25-amdt-1-throttle-quadrant","history":"/api/acts/ad-cl-600-25-amdt-1-throttle-quadrant/history","analysis":"/api/acts/ad-cl-600-25-amdt-1-throttle-quadrant/analysis","conflicts":"/api/acts/ad-cl-600-25-amdt-1-throttle-quadrant/conflicts","importantCases":"/api/acts/ad-cl-600-25-amdt-1-throttle-quadrant/important-cases","documents":"/api/acts/ad-cl-600-25-amdt-1-throttle-quadrant/documents"}}