{"id":"F2008L03687","name":"AD/CL-600/103 - Refuel/Defuel Valve Electrical Bonding","slug":"ad-cl-600-103-refuel-defuel-valve-electrical-bonding","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":75393,"registerId":"commonwealth-F2008L03687-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-600/103 | Refuel/Defuel Valve Electrical Bonding | 11/2008 |\n| ------------- | -------------------------------------- | ------- |\n\n| Applicability: | Model CL-600-2B19 aircraft as follows: |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| | - Serial numbers 7003 through 7067, 7069 through 7939 that have not incorporated the modification of the refuel/defuel shutoff valves according to the original issue of Bombardier Service Bulletin (SB) 601R-28-053. |\n| | - Serial numbers 7989, 7990 and 8000 through 8034. |\n| Requirement: | Carry out the modification of refuel/defuel system in the centre wing fuel tank according to the Accomplishment Instructions of Bombardier SB 601R-28-053, Revision C, dated 14 March 2006 or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada. |\n| | Note 1: Modification of refuel/defuel system accomplished prior to the effective date of this Directive according to Revision A or Revision B of the SB601R-28-053 satisfy the requirements of this Directive. |\n| | Note 2: Transport Canada AD CF-2008-20 refers. |\n| Compliance: | Within 5000 hours time in service after the effective date of this Directive. |\n| | This Airworthiness Directive becomes effective on 23 October 2008. |\n| Background: | Bombardier Aerospace has completed a system safety review of the CL-600-2B19 aircraft fuel system against the new fuel tank safety standards, introduced in Chapter 525 of the Transport Canada Airworthiness Manual through Notice of Proposed Amendment (NPA) 2002-043. The identified non-compliances were assessed using Transport Canada Policy Letter 525-001 to determine if mandatory corrective action is required.The assessment showed that insufficient electrical bonding between the refuel/defuel shutoff valves and the aircraft structure could occur due to the presence of a non-conductive gasket (Gask-O-Seal). In addition, it was also determined that the presence of an anodic coating on the shutoff valve electrical conduit connection fitting could affect electrical bonding. The above conditions, if not corrected, could result in arcing and potential ignition source inside the fuel tank during lightning strikes and consequent fuel tank explosion. |\n\n| | To correct the unsafe condition, this Directive mandates the modification of the refuel/defuel system. |\n| --- | ------------------------------------------------------------------------------------------------------ |\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n9 September 2008","sortOrder":0},{"sectionNumber":"AD/CL-600/103","sectionType":"part","heading":"AD/CL-600/103","content":"## AD/CL-600/103","sortOrder":1},{"sectionNumber":"Refuel/Defuel Valve Electrical Bonding","sectionType":"part","heading":"Refuel/Defuel Valve Electrical Bonding","content":"## Refuel/Defuel Valve Electrical Bonding","sortOrder":2},{"sectionNumber":"11/2008","sectionType":"part","heading":"11/2008","content":"## 11/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The Directive's scope aligns with its stated purpose: mandate a hardware modification for specified CL-600-2B19 serial numbers to address identified electrical-bonding non-compliances. It restricts applicability to listed airframes, accepts certain prior SB revisions as compliant, and sets a 5,000-hour compliance window—no expansion or narrowing beyond those stated measures is indicated in the text."},"complexity_factors":["Applicability limited to specific CL-600-2B19 serial-number ranges (differentiated inclusion/exclusion increases tracking burden)","Mandated action is to carry out Bombardier SB 601R-28-053 (Rev C) or later approved revisions — requires access to and compliance with a manufacturer service bulletin","Note allowing prior compliance with SB Revisions A or B to satisfy the Directive (creates equivalence rules to track)","Compliance timeframe set at 5,000 flight-hours from the Directive effective date — scheduling and maintenance-planning constraint for operators","Technical issue involves electrical bonding (non-conductive gasket and anodic coating) inside fuel tank — requires specific hardware/electrical work and verification","Reference to approval by the Chief, Continuing Airworthiness, Transport Canada introduces administrative discretion over acceptable later revisions","Cross-reference to Transport Canada AD CF-2008-20 (regulatory cross-linkage increases document-tracking)","Safety risk (arcing/ignition) is localized but severe; corrective action is hardware-modification rather than operational change, concentrating costs on operators"],"plain_english_summary":"Mechanically, this Directive requires modifying the refuel/defuel system in the centre wing fuel tank by performing Bombardier Service Bulletin 601R-28-053 (Revision C or later approved revisions). It applies to specified Bombardier CL-600-2B19 airframes and must be completed within 5,000 flight hours of the Directive’s effective date.\n\nTransport Canada and Bombardier state the change corrects poor electrical bonding caused by a non-conductive gasket and anodic coatings that could permit arcing during lightning strikes and risk fuel-tank ignition. Operators bear the cost and installation burden under the compliance window."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific electrical bonding defect in a specific aircraft model's fuel system. The directive remains focused on the single safety issue identified in the Transport Canada safety review."},"complexity_factors":["Single, specific technical requirement with clear reference to manufacturer service bulletin (SB 601R-28-053)","Limited applicability — only specific serial number ranges affected","Two straightforward compliance exceptions (Notes 1 and 2) for prior modifications","Single compliance timeframe (5,000 hours time in service)","No nested conditional logic or extensive cross-referencing to other legislation","Technical aviation terminology requires some domain knowledge but is standard for the industry"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires owners/operators of certain Bombardier Challenger CL-600-2B19 aircraft to modify/replace refuel/defuel valve fittings so the valves are electrically bonded to the airframe. The fix prevents arcing in the centre wing fuel tank (which could lead to an explosion) during lightning strikes. Affected aircraft must comply within 5,000 flight hours from 23 October 2008; prior equivalent work satisfies the requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-103-refuel-defuel-valve-electrical-bonding","history":"/api/acts/ad-cl-600-103-refuel-defuel-valve-electrical-bonding/history","analysis":"/api/acts/ad-cl-600-103-refuel-defuel-valve-electrical-bonding/analysis","conflicts":"/api/acts/ad-cl-600-103-refuel-defuel-valve-electrical-bonding/conflicts","importantCases":"/api/acts/ad-cl-600-103-refuel-defuel-valve-electrical-bonding/important-cases","documents":"/api/acts/ad-cl-600-103-refuel-defuel-valve-electrical-bonding/documents"}}