{"id":"F2008L00400","name":"AD/CL-600/93 - Fuel Quantity Gauging System Wiring","slug":"ad-cl-600-93-fuel-quantity-gauging-system-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119056,"registerId":"commonwealth-F2008L00400-current","compilationNumber":null,"startDate":"2026-04-03","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-600/93 | Fuel Quantity Gauging System Wiring | 3/2008 |\n| ------------ | ----------------------------------- | ------ |\n\n| Applicability: | Model CL-600-2B19 aircraft, serial numbers 7003 through 7067, 7069 through 7982. |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | Modify the Fuel Quantity Gauging System (FQGS) harness routing according to the Accomplishment Instructions of Bombardier Service Bulletin (SB) 601R-28-059, Revision E, dated 29 October 2007, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada. |\n| | Note 1: Modification of FQGS harness routing prior to the effective date of this directive according to the original issue, Revision A, Revision B, Revision C or Revision D of the above noted SB satisfies the requirements of this Directive. |\n| | Note 2: Transport Canada AD CF-2007-36 refers. |\n| Compliance: | Within 10 000 hours time in service after the effective date of this Directive. |\n| | This Airworthiness Directive becomes effective on 13 March 2008. |\n| Background: | Bombardier Aerospace has completed a system safety review of the CL-600-2B19 aircraft fuel system against new fuel tank safety standards, introduced in Chapter 525 of the Airworthiness Manual through Notice of Proposed Amendment (NPA)2002-043. The identified non-compliances were assessed using Transport Canada Policy Letter No. 525-001 to determine if mandatory corrective action is required.This assessment showed that the electrical harness of the FQGS is installed in the same routing as the 28 Volts AC, 28 Volts DC and 115 Volts AC electrical harnesses. A chafing condition between these electrical harnesses and the FQGS harness could increase the surface temperatures of fuel quantity probes and high level sensors inside the fuel tank, resulting in potential ignition source and consequent fuel tank explosion.To correct the unsafe condition, this Directive mandates the modification of FQGS electrical harness routing. |\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n21 January 2008","sortOrder":0},{"sectionNumber":"AD/CL-600/93","sectionType":"part","heading":"AD/CL-600/93","content":"## AD/CL-600/93","sortOrder":1},{"sectionNumber":"Fuel Quantity Gauging System Wiring","sectionType":"part","heading":"Fuel Quantity Gauging System Wiring","content":"## Fuel Quantity Gauging System Wiring","sortOrder":2},{"sectionNumber":"3/2008","sectionType":"part","heading":"3/2008","content":"## 3/2008","sortOrder":3}],"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific wiring safety issue in a defined aircraft series. It has not expanded beyond its original purpose of mitigating fuel tank ignition risks through harness rerouting."},"complexity_factors":["Single, specific technical requirement with clear reference to external manufacturer document (Bombardier Service Bulletin)","Limited applicability — only one aircraft model with defined serial number ranges","Straightforward compliance timeline (10,000 hours time in service)","Two simple notes providing grandfathering for prior compliance and cross-reference to Canadian authority","No nested exceptions, conditional logic, or extensive defined terms","Background section explains rationale in plain technical language"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires owners/operators of specified Bombardier Challenger 600-2B19 jets (S/N 7003–7067, 7069–7982) to reroute fuel quantity gauging system wiring away from high-voltage power cables to eliminate chafing that could spark inside the fuel tank and risk explosion. \n\nAffected operators must complete the modification within 10,000 flight hours after 13 March 2008; previously completed fixes under earlier Bombardier instructions remain acceptable."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive maintains the original scope: mandating re-routing of the FQGS harness on the specified CL-600-2B19 serial numbers to address chafing/ignition risk. Notes permit earlier SB revisions to satisfy the requirement and it references Transport Canada's AD, but it does not expand applicability or create new types of obligations beyond the specified modification and compliance timeframe."},"complexity_factors":["Technical work requires certified maintenance action to re-route aircraft wiring and verify compliance with SB procedures.","Reliance on a manufacturer Service Bulletin (SB) as the mandated method, with only Transport Canada approval allowed for later revisions.","Safety-critical electrical-fuel interaction: requires correct routing to mitigate chafing and potential ignition sources in fuel tanks.","Narrow applicability limited to specific serial-number range, requiring aircraft-by-aircraft applicability checks.","Compliance metric expressed in flight hours (10,000 hours), adding planning and tracking burden for operators.","Provision that earlier SB revisions already performed satisfy the AD introduces record-review steps for operators and inspectors.","Cross-reference to Transport Canada AD (CF-2007-36) may require coordination of foreign/reciprocal regulatory approvals and records."],"plain_english_summary":"This directive requires owners/operators of Bombardier CL-600-2B19 aeroplanes (serials 7003–7067, 7069–7982) to re-route the Fuel Quantity Gauging System (FQGS) wiring per Bombardier Service Bulletin 601R-28-059 (Revision E or later approved by Transport Canada). Modification must be done within 10,000 flight hours. Operators pay for the maintenance and must use the approved SB (or earlier approved revisions). The measure separates the FQGS harness from other power harnesses to reduce chafing and the risk of ignition inside fuel tanks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-93-fuel-quantity-gauging-system-wiring","history":"/api/acts/ad-cl-600-93-fuel-quantity-gauging-system-wiring/history","analysis":"/api/acts/ad-cl-600-93-fuel-quantity-gauging-system-wiring/analysis","conflicts":"/api/acts/ad-cl-600-93-fuel-quantity-gauging-system-wiring/conflicts","importantCases":"/api/acts/ad-cl-600-93-fuel-quantity-gauging-system-wiring/important-cases","documents":"/api/acts/ad-cl-600-93-fuel-quantity-gauging-system-wiring/documents"}}