{"id":"F2007L04271","name":"AD/CL-600/89 - Fuel Tank Sealant","slug":"ad-cl-600-89-fuel-tank-sealant","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":70503,"registerId":"commonwealth-F2007L04271-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-600/89 | Fuel Tank Sealant | 12/2007 |\n| ------------ | ----------------- | ------- |\n\n| Applicability: | Bombardier Inc. Model CL-600-2B19 aircraft, serial numbers 7003 through 7067 and 7069 through 7924. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement: | Application of Sealant to the Collector Fuel Tank Bolts (Applicable to Aircraft Serial Numbers 7003 through 7067 and 7069 through 7797)1. Apply sealant to bolts on the collector fuel tanks according to the Accomplishment Instructions of Revision A of Bombardier Service Bulletin (SB) 601R-28-051, dated 30 March 2005, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.Application of sealant prior to the effective date of this directive according to the original issue of the above-noted SB satisfies the requirement 1 of this AD.Application of Sealant to the Transfer Ejector Pumps (Applicable to Aircraft Serial Numbers 7003 through 7067 and 7069 through 7924)2. Carry out a general visual inspection of the left and right transfer ejector pumps for the presence of a fillet seal on the edge of the pumps and sealant on the bolts, according to the Accomplishment Instructions of Revision A of Bombardier SB 601R-28-060, dated 30 March 2005, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.3. If sealant is missing from the edge of the transfer ejector pump or from any of the bolts, prior to further flight, apply sealant to the affected areas according to the Accomplishment Instructions of Revision A of Bombardier SB 601R-28-060, dated 30 March 2005, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.Inspection and application of sealant prior to the effective date of this directive according to the original issue of SB 601R-28-060 satisfies requirements 2 and 3 of this AD.Note: Transport Canada AD CF-2007-17 dated 4 September 2007 refers. |\n| Compliance: | Within 5000 flight hours after the effective date of this directive, unless already accomplished. |\n\n| | This Airworthiness Directive becomes effective on 22 November 2007. |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Background: | Bombardier Aerospace has completed a system safety review of the CL-600-2B19 aircraft fuel system against new fuel tank safety standards.The assessment showed that sealant has not been applied to bolts on the collector fuel tanks or the transfer ejector fuel pumps. Lack of sealant on the above-noted locations, if not corrected, could result in arcing and potential ignition source inside the fuel tank during lightning strikes and consequent fuel tank explosion. To correct the unsafe condition, this AD mandates the application of sealant to the bolts that attach various fittings on the collector fuel tanks, to the edges of the transfer ejector pumps and to the bolts that attach the transfer ejector pump to the transfer ejector pump casing. |\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n24 September 2007","sortOrder":0},{"sectionNumber":"AD/CL-600/89","sectionType":"part","heading":"AD/CL-600/89","content":"## AD/CL-600/89","sortOrder":1},{"sectionNumber":"Fuel Tank Sealant","sectionType":"part","heading":"Fuel Tank Sealant","content":"## Fuel Tank Sealant","sortOrder":2},{"sectionNumber":"12/2007","sectionType":"part","heading":"12/2007","content":"## 12/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD implements a corrective maintenance requirement limited to specified serial numbers and specific parts (collector tank bolts; transfer ejector pumps) and permits prior compliance under the original service bulletin to satisfy the directive (Requirement; Applicability). The directive therefore follows the original safety intent to mitigate lightning‑induced ignition risk without expanding affected aircraft or tasks beyond that intent (Background; Requirement)."},"complexity_factors":["Narrow applicability by serial number range (Applicability).","Two distinct corrective tasks with overlapping but different serial-number applicability: collector fuel tank bolts and transfer ejector pumps (Requirement: parts 1–3).","Mandates work to be done in accordance with specific Bombardier Service Bulletins, but only revisions approved by the Chief, Continuing Airworthiness, Transport Canada (Requirement: references to SB Revision A or later approved revisions) — creates regulator approval dependence.","Allows prior compliance under the original issue of the service bulletins to satisfy the AD (Requirement: satisfying language) — reduces duplication but requires record verification.","Compliance deadline set as 5,000 flight hours from the AD effective date (Compliance) — provides operators with a measurable scheduling window.","Inspection standard is a \"general visual inspection\" with an immediate correction obligation \"prior to further flight\" if sealant is missing from ejector pumps (Requirement 2–3) — creates low technical complexity but high immediacy for missing sealant.","Safety rationale tied to risk of arcing and ignition during lightning strikes (Background) — explains purpose but does not change technical steps.","Transport Canada airworthiness directive cross-reference (Note) introduces an international regulatory alignment factor."],"plain_english_summary":"Requires operators of Bombardier CL-600-2B19 aircraft (specified serial numbers) to apply sealant to collector fuel tank bolts and to inspect/apply sealant to transfer ejector pumps and their bolts, following Bombardier service bulletins approved by Transport Canada. Compliance is required within 5,000 flight hours. The rule addresses a potential lightning‑induced arcing risk inside fuel tanks; aircraft owners/operators pay for and schedule the required maintenance."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific fuel tank sealant deficiency identified through Bombardier's safety review. The document applies targeted fixes to defined aircraft serial numbers without expanding into broader operational or design requirements."},"complexity_factors":["Multiple serial number ranges with different applicability (7003-7067, 7069-7797, 7069-7924)","Two distinct technical requirements with different aircraft coverage","Cross-references to external technical documents (Bombardier Service Bulletins 601R-28-051 and 601R-28-060, Revision A)","Conditional compliance logic (prior application under original SB issues satisfies requirements)","Reference to foreign aviation authority directive (Transport Canada AD CF-2007-17)","Technical aviation terminology requiring specialised knowledge (collector fuel tanks, transfer ejector pumps, fillet seals, arcing)"],"plain_english_summary":"This AD orders owners/operators of specified Bombardier Challenger CL-600-2B19 jets (S/N 7003–7067, 7069–7924) to seal collector tank bolts (older serials up to 7797) and inspect/seal transfer ejector pumps to stop lightning-induced arcing that could ignite fuel. Compliance is mandatory within 5,000 flight hours from 22 Nov 2007; work already done per earlier Bombardier service bulletins is acceptable relief."},"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-600-89-fuel-tank-sealant","history":"/api/acts/ad-cl-600-89-fuel-tank-sealant/history","analysis":"/api/acts/ad-cl-600-89-fuel-tank-sealant/analysis","conflicts":"/api/acts/ad-cl-600-89-fuel-tank-sealant/conflicts","importantCases":"/api/acts/ad-cl-600-89-fuel-tank-sealant/important-cases","documents":"/api/acts/ad-cl-600-89-fuel-tank-sealant/documents"}}