{"id":"F2008L00149","name":"AD/CL-600/91 - Fuel System Safety","slug":"ad-cl-600-91-fuel-system-safety","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":72295,"registerId":"commonwealth-F2008L00149-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-600/91 | Fuel System Safety | 3/2008 DM |\n| ------------ | ------------------ | --------- |\n\n```html\n

Applicability:

Model CL-600-2B19 aircraft, all serial numbers.

Requirement:

1. Revise the approved maintenance schedule by incorporating the following inspection requirements as contained in Revision 7 of Canadair Regional Jet Model CL-600-2B19 Maintenance Requirements Manual, CSP A-053, Part 2, Appendix D, “Fuel System Limitations”:

Task Number

Task Description

28-11-00-601

Detailed Inspection of the critical bonding jumpers for corrosion and damage

28-11-00-602

Function Check of the critical bonding jumpers

28-11-00-603

Detailed Inspection of the sealant on the in-tank LRUs

28-11-00-604

Detailed Inspection of the fuel tank wiring harness clipping along the front and rear spar of the centre and wing fuel tanks for condition and security

2. For aircraft with more than 15 000 hours total time in service (TIS) on the effective date of this Directive, carry out the initial inspection of the tasks detailed in Requirement 1.

3. Revise the approved maintenance schedule by incorporating the following inspection and maintenance requirements as contained in Revision 7 of Canadair Regional Jet Model CL-600-2B19 Maintenance Requirements Manual, CSP A-053, Part 2, Appendix D, “Fuel System Limitations”:

Task Number

Task Description

29-33-01-601

Function Check of the hydraulic system No. 1, No. 2 and No. 3 reservoir temperature transducer

29-33-01-602

Discard of the hydraulic system No. 1, No. 2 and No. 3 reservoir temperature transducer

\n```\n\n| | 4. If not already accomplished, carry out the initial check of task number 29-33-01-601 detailed in Requirement 3. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| | 5. For aircraft with more than 27 500 hours total TIS on the effective date of this Directive, carry out task number 29-33-01-602 detailed in Requirement 3. |\n| | Note: Transport Canada AD CF-2007-29 refers. |\n| Compliance: | For Requirement 1 - Within 60 days after the effective date of this Directive. |\n| | For Requirement 2 - Within 5 000 hours TIS after the effective date of this Directive. |\n| | For Requirement 3 - Within 60 days after the effective date of this Directive. |\n| | For Requirement 4 - Within 5 000 hours TIS after the effective date of this Directive. |\n| | For Requirement 5 - Initially within 2 500 hours TIS after the effective date of this Directive. |\n| | This Airworthiness Directive becomes effective on 31 January 2008. |\n| Background: | Bombardier Aerospace has completed a system safety review of the aircraft fuel system against 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 then assessed using Transport Canada Policy Letter No. 525-001, to determine if mandatory corrective action is required.The assessment showed that supplemental maintenance tasks are required to prevent potential ignition sources inside the fuel system, which could result in a fuel tank explosion. Revision has been made to Canadair Regional Jet Model CL-600-2B19 Maintenance Requirements Manual, CSP A-053, Part 2, Appendix D, “Fuel System Limitations” to introduce the required maintenance tasks. |\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n16 January 2008","sortOrder":0},{"sectionNumber":"AD/CL-600/91","sectionType":"part","heading":"AD/CL-600/91","content":"## AD/CL-600/91","sortOrder":1},{"sectionNumber":"Fuel System Safety","sectionType":"part","heading":"Fuel System Safety","content":"## Fuel System Safety","sortOrder":2},{"sectionNumber":"3/2008 DM","sectionType":"part","heading":"3/2008 DM","content":"## 3/2008 DM","sortOrder":3}],"analysis":{"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"},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The Directive implements Bombardier's system safety review corrections by mandating maintenance tasks from the aircraft's Maintenance Requirements Manual to address fuel-tank ignition risks. It is limited to CL-600-2B19 aeroplanes and to the specified inspection/maintenance items and compliance windows in the Directive; the text does not indicate an expansion beyond that corrective scope."},"complexity_factors":["Multiple distinct tasks to incorporate (Task Nos 28-11-00-601–604 and 29-33-01-601–602) increasing procedural steps and tracking.","Tiered TIS thresholds determining who needs immediate action (aircraft >15,000 TIS; >27,500 TIS) (Requirements 2 and 5).","Varied compliance windows (60 days; within 5,000 hours TIS; initial within 2,500 hours TIS) requiring different scheduling treatments (Compliance section).","Mandatory revision of the approved maintenance schedule — administrative and regulatory approval burden on operators (Requirement 1 and 3).","Dependency on an external document: Revision 7 of CSP A-053 Part 2 Appendix D is normatively referenced (Requirements 1 and 3).","One task requires physical discard of components (29-33-01-602) — immediate parts/replacement cost and logistics (Requirement 3, Requirement 5).","Cross-reference to Transport Canada AD CF-2007-29 introduces a need for coordination with related foreign AD guidance (Note).","Applicability to all serial numbers increases universality but concentrates costs on operators of older/high-TIS airframes."],"plain_english_summary":"Requires operators of Bombardier CL-600-2B19 aircraft to revise their approved maintenance schedules to add specified fuel-system inspection and maintenance tasks taken from Revision 7 of the aircraft Maintenance Requirements Manual. The Directive applies to all serial numbers, sets compliance deadlines and hours-in-service triggers for initial inspections, and aims to reduce possible ignition sources inside fuel tanks."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive maintaining its original purpose of mandating specific safety inspections. The scope remains focused on fuel system and hydraulic system safety for the CL-600-2B19 aircraft type, consistent with the directive's stated intent to address identified non-compliances with fuel tank safety standards."},"complexity_factors":["Multiple conditional requirements based on aircraft flight hours (15,000 hours vs 27,500 hours thresholds)","Cross-references to external technical documents (Canadair Regional Jet Maintenance Requirements Manual CSP A-053, Revision 7)","Specific task numbering system (28-11-00-601 format) requiring technical manual lookup","Five separate requirements with different compliance timeframes (60 days vs 2,500 vs 5,000 flight hours)","Reference to Canadian aviation regulation (Transport Canada AD CF-2007-29) for additional context","Technical aviation terminology requiring domain knowledge (LRUs, bonding jumpers, TIS - Time In Service)"],"plain_english_summary":"Australia’s Civil Aviation Safety Authority issued a mandatory Airworthiness Directive for Bombardier CL‑600‑2B19 (CRJ) aircraft requiring updated maintenance schedules to inspect and test fuel‑tank electrical bonding jumpers, sealant, wiring security, and hydraulic reservoir temperature sensors. Operators and maintenance organisations must meet flight‑hour deadlines (inspections at >15,000 hours; certain sensor replacements at >27,500 hours) to reduce spark/explosion risk. Effective 31 January 2008."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-91-fuel-system-safety","history":"/api/acts/ad-cl-600-91-fuel-system-safety/history","analysis":"/api/acts/ad-cl-600-91-fuel-system-safety/analysis","conflicts":"/api/acts/ad-cl-600-91-fuel-system-safety/conflicts","importantCases":"/api/acts/ad-cl-600-91-fuel-system-safety/important-cases","documents":"/api/acts/ad-cl-600-91-fuel-system-safety/documents"}}