{"id":"F2006B08609","name":"AD/CL-600/47 - Center Tank Fuel Transfer Shutoff Valve","slug":"ad-cl-600-47-center-tank-fuel-transfer-shutoff-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51530,"registerId":"commonwealth-F2006B08609-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\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\n![](image.001.png)\n\nBombardier (Canadair) CL-600 (Challenger) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/CL-600/47 Center Tank Fuel Transfer S","sectionType":"part","heading":"AD/CL-600/47 Center Tank Fuel Transfer Shutoff Valve 2/2002","content":"# AD/CL-600/47 Center Tank Fuel Transfer Shutoff Valve 2/2002\n\nTX\n\nApplicability: CL-600-2B19 \"Regional Jet\" aircraft, serial numbers 7003 and subsequent. Requirement: Applicable to all affected aircraft.\n\n    Open and install a lock ring on applicable circuit breakers in accordance with the Accomplishment Instructions of the Bombardier Alert Service Bulletin (ASB) A601R-28-045, Revision A, dated 7 December 2001.\n\n    2. Disconnect and stow the electrical wires from the circuit breakers opened per Requirement 1, in accordance with the Accomplishment Instructions of ASB A601R-28-045, Revision A.\n\n    3. Determine the part number (P/N) of the fuel transfer shutoff valves installed in the center fuel tank. Replace any valve P/N 601R62256-5 with a valve P/N 601R62256-3.\n\n    4. If, as a result of Requirement 3, it has been verified that only valves with P/N 601R62256-3 are installed, reconnect the circuit breaker wires that have been disconnected and stowed in accordance with Requirement 2, remove lock rings and reset the associated circuit breakers.\n\n    5. Dispatch of aircraft with inoperative fuel transfer shutoff valves:\n\nOperation of the affected aircraft is permitted with the center fuel tank full and with both fuel transfer shutoff valves inoperative (applicable circuit breakers opened in accordance with Requirement 1), subject to the restrictions imposed in Requirement 6, if applicable.","sortOrder":1},{"sectionNumber":"The Flight Crew must be briefed that the","sectionType":"part","heading":"The Flight Crew must be briefed that the wing tanks will indicate full until the center tank is empty. An Engine Indicating and Crew Alerting System LR XFER SOV message will be indicated on the ground. This message may disappear during climb but will remain on during the remainder of the flight.","content":"## The Flight Crew must be briefed that the wing tanks will indicate full until the center tank is empty. An Engine Indicating and Crew Alerting System LR XFER SOV message will be indicated on the ground. This message may disappear during climb but will remain on during the remainder of the flight.\n\nThis may be accomplished by inserting a copy of this Directive into the Aircraft Operations Manual.","sortOrder":2},{"sectionNumber":"Bombardier (Canadair) CL-600 (Challenger","sectionType":"part","heading":"Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes","content":"## Bombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\nAD/CL-600/47 (continued)","sortOrder":3},{"sectionNumber":"Applicable to aircraft with serial numbe","sectionType":"part","heading":"Applicable to aircraft with serial numbers 7003 through 7109.","content":"## Applicable to aircraft with serial numbers 7003 through 7109.\n\n    6. Determine whether the fuel vent system has been modified in accordance with the requirements of Bombardier Service Bulletin 601R-28-024, Revision A, dated 11 November 1998). Aircraft, which have not incorporated the fuel vent system modification, must operate with less than 200 pounds of fuel in the center fuel tank. Amend the limitation section of the Aircraft Flight Manual (AFM) to reflect this limit.\n\nThis amendment may be accomplished by inserting a copy of this Directive into the AFM limitation section.\n\nNote: Transport Canada CF-2001-47 refers.\n\nCompliance: For Requirement 1 - Within one day after the effective date of this Directive. For Requirement 2 - Within four days after the effective date of this Directive. For Requirement 3 - Within 45 days after the effective date of this Directive For Requirement 4 - Concurrent with Requirement 3.\n\nFor Requirement 5 - As of the effective date of this Directive until Requirement 4 is accomplished.\n\nFor Requirement 6 - Within one day after the effective date of this Directive, until Requirement 4 is accomplished.\n\nThis Airworthiness Directive becomes effective on 19 December 2001.\n\nBackground: Transport Canada has advised that during bench testing of the center tank fuel transfer shutoff valve, it was found that, if the valve fails, it could overheat to a temperature that exceeds the fuel hot surface ignition point.\n\n![Signature of Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 17 December 2001\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 19 December 2001.","sortOrder":4}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The Directive's scope is as stated in the instrument: it targets Bombardier CL-600-2B19 aircraft (serials 7003 onward, with text specifying 7003–7109) and specific valve P/Ns (Requirement 3; Applicability). There is no material change of scope from the AD text provided—the measures apply only to the listed aircraft/parts and the stated operational limits."},"complexity_factors":["Technical maintenance work: physical installation of lock rings and wire stowage, plus valve part-number identification and replacement (Requirement 1–4).","Operational constraints: permits operation with both transfer valves inoperative only under specified conditions and requires crew briefing on indications (Requirement 5).","AFM/operations paperwork: insertion of the Directive into the Aircraft Operations Manual and AFM limitation section, and briefing obligations (Requirement 5 and Requirement 6).","Multiple, short compliance deadlines creating scheduling pressure (Compliance: 1 day, 4 days, 45 days for different Requirements).","Parts and SB dependency: replacement specifies particular P/Ns (Requirement 3) and references Bombardier ASB A601R-28-045 and Service Bulletin 601R-28-024, creating reliance on supplier/maintenance logistics.","Applicability limits and potential ambiguity: applies to CL-600-2B19 serials 7003 and subsequent, with a repeated statement limiting to 7003–7109 (Applicability; \"Applicable to aircraft with serial numbers 7003 through 7109\").","Safety-critical risk and enforcement: addresses a hot-surface ignition hazard (Background), increasing consequences for non-compliance and requiring coordination between maintenance and flight crew."],"plain_english_summary":"This Airworthiness Directive imposes mandatory maintenance and operational steps for Bombardier CL-600-2B19 aircraft (serials listed) to address a centre-tank fuel transfer shutoff valve failure that can overheat to fuel-ignition temperatures (Background). It requires circuit-breaker locking/disconnection, valve part-number checks and replacements, temporary dispatch limits, and crew/AFM briefings until corrective work is done."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive addressing a specific unsafe condition in a specific aircraft type. The scope remains tightly focused on the fuel transfer shutoff valve issue identified in the background."},"complexity_factors":["Multiple interdependent requirements with different compliance timeframes (1 day, 4 days, 45 days, concurrent actions)","Conditional logic: Requirement 4 only applies if Requirement 3 verifies specific part numbers are installed","Nested applicability: Requirement 6 only applies to specific serial number range (7003-7109) and only if fuel vent system modification not incorporated","Cross-reference to external technical document (Bombardier Alert Service Bulletin A601R-28-045)","Operational restrictions require manual amendments (inserting directive copies into Aircraft Flight Manual and Operations Manual)","Temporary dispatch provisions (Requirement 5) create parallel compliance paths with ongoing restrictions"],"plain_english_summary":"This CASA safety order targets Bombardier CL-600-2B19 Regional Jets (serials 7003+) after tests showed a center‑tank fuel valve can overheat and risk ignition. It requires disabling the affected valve circuitry now and replacing faulty valve units within a short compliance window, with staged reconnection once safe.\n\nAffected aircraft may operate under strict temporary restrictions (tank fill rules, pilot warnings and a cockpit alert) to prevent fuel‑tank fires while repairs are completed."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-47-center-tank-fuel-transfer-shutoff-valve","history":"/api/acts/ad-cl-600-47-center-tank-fuel-transfer-shutoff-valve/history","analysis":"/api/acts/ad-cl-600-47-center-tank-fuel-transfer-shutoff-valve/analysis","conflicts":"/api/acts/ad-cl-600-47-center-tank-fuel-transfer-shutoff-valve/conflicts","importantCases":"/api/acts/ad-cl-600-47-center-tank-fuel-transfer-shutoff-valve/important-cases","documents":"/api/acts/ad-cl-600-47-center-tank-fuel-transfer-shutoff-valve/documents"}}