{"id":"F2006B08613","name":"AD/CL-600/50 - Main Fuel Tank Vent System Modification","slug":"ad-cl-600-50-main-fuel-tank-vent-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51549,"registerId":"commonwealth-F2006B08613-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.001.png)\n\n![](image.001.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.\n\nBombardier (Canadair) CL-600 (Challenger) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/CL-600/50 Main Fuel Tank Vent System ","sectionType":"part","heading":"AD/CL-600/50 Main Fuel Tank Vent System Modification 5/2002","content":"# AD/CL-600/50 Main Fuel Tank Vent System Modification 5/2002\n\nApplicability: CL-600-2B19 “Regional Jet” aeroplanes serial numbers 7003 to 7067 and 7069 to 7109.\n\nRequirement: Modify the main fuel tank fuel vent tubing in accordance with Bombardier Service Bulletin 601R-28-024, Revision A dated 11 November 1998.\n\nNote: Transport Canada AD CF-2001-31 refers.\n\nCompliance: Before further flight after the effective date of this Airworthiness Directive.\n\nThis Airworthiness Directive becomes effective on 16 May 2002.\n\nBackground: During refuelling, ground or flight manoeuvres, fuel trapped in the main tank vent line system may spill from the NACA scoops, run along the lower wing skin, accumulate in the dry bay and possibly drip onto the main landing gear and brakes. This Airworthiness Directive therefore requires modification of the fuel vent system to prevent the possibility of a fire occurring.\n\n![Signature of Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 10 April 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 24 April 2002.","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":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific unsafe fuel vent condition on specific aircraft models. No scope creep is evident."},"complexity_factors":["Single, clearly defined applicability (specific aircraft serial numbers)","Single requirement referencing an external technical document (Bombardier Service Bulletin)","No defined terms section","No nested exceptions or conditional logic","Straightforward compliance deadline (before further flight after effective date)","Total length: approximately 250 words"],"plain_english_summary":"This AD mandates a fuel-vent modification on Bombardier CL-600-2B19 Regional Jets (S/N 7003–7067, 7069–7109) to reroute vent tubing per the manufacturer’s bulletin. It addresses a fuel-trap/fire hazard from vented fuel pooling and dripping onto landing gear/brakes. Owners/operators must complete the modification before the aircraft’s next flight after 16 May 2002; compliance is mandatory."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD implements a targeted modification to the main fuel tank vent tubing for the listed CL-600-2B19 serial numbers and repeats the stated safety rationale (preventing fuel spillage and fire risk). It does not expand applicability or add requirements beyond the Bombardier service bulletin and the referenced Transport Canada AD."},"complexity_factors":["Narrow, serial-numbered applicability (7003–7067 and 7069–7109) requires precise fleet tracking for compliance.","Technical compliance relies on Bombardier Service Bulletin 601R-28-024 Revision A for the modification details (workshop procedures, parts, certified personnel).","Immediate compliance requirement: 'Before further flight' imposes potential operational disruption and aircraft grounding until work is done.","Safety-critical system: fuel vent modification involves fuel system access and certified maintenance, increasing labour/inspection burden and regulatory oversight.","Regulatory basis: issued by a CASA delegate under CAR 1998 subreg 39.1(1), making the requirement mandatory rather than advisory.","Cross-reference to Transport Canada AD CF-2001-31 indicates international regulatory alignment but dependence on foreign service instructions."],"plain_english_summary":"Requires modification of the main fuel tank vent tubing on specified Bombardier CL-600-2B19 Regional Jet aeroplanes (serial numbers 7003–7067 and 7069–7109) to the configuration in Bombardier Service Bulletin 601R‑28‑024 Revision A, with compliance required before the next flight. CASA issued the directive under CAR 1998 subreg 39.1(1) to prevent fuel from spilling from vent lines onto the wing, landing gear and brakes, which the AD identifies as a fire risk. Operators bear the cost and must arrange immediate maintenance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-50-main-fuel-tank-vent-system-modification","history":"/api/acts/ad-cl-600-50-main-fuel-tank-vent-system-modification/history","analysis":"/api/acts/ad-cl-600-50-main-fuel-tank-vent-system-modification/analysis","conflicts":"/api/acts/ad-cl-600-50-main-fuel-tank-vent-system-modification/conflicts","importantCases":"/api/acts/ad-cl-600-50-main-fuel-tank-vent-system-modification/important-cases","documents":"/api/acts/ad-cl-600-50-main-fuel-tank-vent-system-modification/documents"}}