{"id":"F2006B08600","name":"AD/CL-600/39 - Fuel Level Sensing Wiring Chafing","slug":"ad-cl-600-39-fuel-level-sensing-wiring-chafing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51493,"registerId":"commonwealth-F2006B08600-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \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.","sortOrder":0},{"sectionNumber":"AD/CL-600/39 Fuel Level Sensing Wiring C","sectionType":"part","heading":"AD/CL-600/39 Fuel Level Sensing Wiring Chafing 1/2001","content":"# AD/CL-600/39 Fuel Level Sensing Wiring Chafing 1/2001\n\nApplicability: Model CL-600-2B19 “Regional Jet” aeroplanes, serial numbers 7003 through 7295 inclusive.\n\nRequirement: 1. Visually inspect the fuel-level sensing wires in the centre fuel tank for damage and for clearance from adjacent structure in accordance with the Accomplishment Instructions of Bombardier Alert Service Bulletin (ASB) 601R-28-042 dated 14 August 2000. Clearance between the fuel probe wires and adjacent structure must not be less than 3.125mm (0.125 inch). Clearance between the loose wires and the adjacent structure must not be less than 12.5mm (0.5 inch).\n\n    2. If any damage to fuel-level sensing wires is found, replace the damaged wires Part Number (P/N) 601R57137-1/01 with wires P/N 601R57137-1/S01 in accordance with the Accomplishment Instructions of ASB 601R-28-042.\n\n    3. Install cushioned clamps between the fuel-level sensor wires and pipe P/N 601R62261-55 in accordance with the Accomplishment Instructions of ASB 601R- 28-042.\n\n    4. Report the finding of the Requirement 1 inspection to Bombardier in accordance with the procedures detailed in Annex A of ASB 601R-28-042.\n\nNote: Transport Canada AD CF-2000-31 refers.\n\nCompliance: For Requirement 1 \\- At the next “A” check or within 500 hours time in service after the effective date of this Directive, whichever occurs first.\n\nFor Requirement 2 \\- Before further flight.\n\nFor Requirement 3 \\- At the next “A” check or within 500 hours time in service after the effective date of this Directive, whichever occurs first.\n\nFor requirement 4 \\- Within 14 days after the Requirement 1 inspection. This Airworthiness Directive becomes effective on 25 January 2001.","sortOrder":1}],"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 is a standard airworthiness directive with focused scope. It addresses a specific technical safety issue (wiring chafing in fuel tanks) on a defined aircraft type. There is no indication of scope creep; the directive remains tightly targeted at the identified unsafe condition."},"complexity_factors":["Single specific aircraft model and limited serial number range (7003-7295)","Four distinct requirements with different compliance timeframes","References to external technical document (Bombardier Alert Service Bulletin 601R-28-042) for detailed instructions","Specific part numbers and precise measurements (3.125mm, 12.5mm clearances)","Conditional logic ('if damage found, replace before further flight')","Cross-reference to Canadian aviation regulation (Transport Canada AD CF-2000-31)"],"plain_english_summary":"This CASA safety order requires operators of Bombardier CRJ200 (CL-600-2B19, serials 7003–7295) to inspect and, where needed, repair or replace centre‑tank fuel‑level sensor wiring and install protective clamps because wires are chafing against nearby structure — a fire/explosion risk. Inspections and clamps must be done at the next A‑check or within 500 flight hours; damaged wires must be replaced before further flight and findings reported to Bombardier within 14 days."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive applies specifically to CL-600-2B19 serial numbers 7003–7295 and mandates inspections, replacements, clamp installations, and reporting as set out. The text contains no indication that the applicability or core requirements were expanded or narrowed beyond that stated scope; it cross-references Bombardier ASB 601R-28-042 and Transport Canada AD CF-2000-31 but does not alter the listed applicability or compliance times."},"complexity_factors":["Technical tolerances specified (clearance minima 3.125 mm and 12.5 mm) require careful measurement and skilled maintenance.","Limited applicability by serial number (7003–7295) narrows the population but requires fleet-specific tracking.","Mandatory replacement uses defined part numbers (P/N 601R57137-1/01 → P/N 601R57137-1/S01), creating procurement and inventory tasks.","Procedural work is governed by an external document (Bombardier ASB 601R-28-042), so operators must obtain and follow that SB exactly.","Staggered compliance windows: inspection/installation by next “A” check or 500 hours, immediate action (before further flight) if damage is found, and 14-day reporting — operational scheduling impact.","Reporting requirement to manufacturer (Annex A of ASB) imposes administrative burden and creates a data-flow obligation.","Reference to Transport Canada AD indicates cross-jurisdictional alignment, which may affect international operators.","Issued under delegated regulatory power (subregulation 39.1(1) of CAR 1998), so enforcement and interpretation rest with the regulator and its delegate."],"plain_english_summary":"This Airworthiness Directive requires operators of Bombardier CL-600-2B19 regional jets (serial numbers 7003–7295) to inspect centre-tank fuel-level sensing wires for damage and minimum clearances, fit cushioned clamps, replace any damaged wires with a specified part, and report findings to Bombardier. Operators must carry out work to the procedures in Bombardier Alert Service Bulletin 601R-28-042 and meet the time limits in the Compliance paragraph: inspection at the next “A” check or within 500 hours, replacement before further flight, clamps within 500 hours, report within 14 days."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-39-fuel-level-sensing-wiring-chafing","history":"/api/acts/ad-cl-600-39-fuel-level-sensing-wiring-chafing/history","analysis":"/api/acts/ad-cl-600-39-fuel-level-sensing-wiring-chafing/analysis","conflicts":"/api/acts/ad-cl-600-39-fuel-level-sensing-wiring-chafing/conflicts","importantCases":"/api/acts/ad-cl-600-39-fuel-level-sensing-wiring-chafing/important-cases","documents":"/api/acts/ad-cl-600-39-fuel-level-sensing-wiring-chafing/documents"}}