{"id":"F2006B08616","name":"AD/CL-600/53 - Fuel Migration and Centre of Gravity Limit","slug":"ad-cl-600-53-fuel-migration-and-centre-of-gravity-limit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51561,"registerId":"commonwealth-F2006B08616-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\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\n![](image.001.png)\n\nBombardier (Canadair) CL-600 (Challenger) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/CL-600/53 Fuel Migration and Centre o","sectionType":"part","heading":"AD/CL-600/53 Fuel Migration and Centre of Gravity Limit 7/2002","content":"# AD/CL-600/53 Fuel Migration and Centre of Gravity Limit 7/2002\n\nDM\n\nApplicability: Model CL-600-2B16 (CL-604) aircraft, serial numbers 5301 through 5489.\n\nRequirement: Amend all copies of the CL-604 Aircraft Flight Manual (AFM), PSP 604 1, as follows:\n\n    In Figure 02-03-01, Centre of Gravity Limits (MTOW 47,600lb) (page 02-03- 01):\n\nChange the aft C of G limit to 34.5% for weights above the maximum landing weight of 38,000lb / 17,237kg.\n\n    b. In Figure 02-03-02, Centre of Gravity Limits (MTOW 48,200lb) (page 02-03- 02):\n\nChange the aft C of G limit to 34.5% for weights above the maximum landing weight of 38,000lb / 17,237kg.\n\nInsertion of Temporary Revision TR 604/13 into the AFM terminates the requirements of this Directive.\n\nNote 1: Transport Canada AD CF-2001-07 refers.\n\nCompliance: Within 2 calendar days after 15 May 2002, unless already accomplished.","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 condition in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, specific aircraft model and serial number range (narrow applicability)","One clear mechanical action required (amend flight manual figures)","Simple alternative compliance path (insert temporary revision)","No nested conditions, exceptions, or cross-references to other legislation","Straightforward deadline calculation (2 calendar days from fixed date)","Only one defined term of note ('MTOW' — Maximum Take-Off Weight, though not explicitly defined here)"],"plain_english_summary":"This AD mandates that operators of Bombardier Challenger 604 jets (S/N 5301–5489) revise their flight manuals to tighten rear centre-of-gravity limits for weights above 38,000 lb. It addresses fuel migration that can shift balance and risk loss of control. Compliance is quick — update the manual pages or insert Temporary Revision TR 604/13 — and was required within two days of 15 May 2002."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This AD changes the previously published aft centre-of-gravity limit in the CL-604 AFM for weights above the maximum landing weight to 34.5% for serials 5301–5489, imposing a new operational limit until Temporary Revision TR 604/13 is inserted ( Requirement; Applicability; Compliance )."},"complexity_factors":["Narrow technical change: amend aft centre-of-gravity limit in AFM charts ( Requirement )","Limited applicability to specific aircraft model and serial numbers ( Applicability )","Very short compliance window — 2 calendar days after 15 May 2002 ( Compliance )","Termination mechanism via insertion of Temporary Revision TR 604/13 ( Requirement )","Cross-reference to foreign authority AD (Transport Canada AD CF-2001-07) introduces regulatory linkage ( Note 1 )","Operational impact on loading, flight planning and dispatch procedures despite simple textual amendment"],"plain_english_summary":"Requires operators of Bombardier CL-604 aircraft (serials 5301–5489) to amend the Aircraft Flight Manual by lowering the aft centre-of-gravity limit to 34.5% for weights above the maximum landing weight (38,000 lb). (Requirement, Applicability)\n\nOperators must insert Temporary Revision TR 604/13 to terminate the directive or comply within two calendar days after 15 May 2002; operators bear the compliance burden and must adjust loading and flight planning to meet the new limit. (Compliance)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-53-fuel-migration-and-centre-of-gravity-limit","history":"/api/acts/ad-cl-600-53-fuel-migration-and-centre-of-gravity-limit/history","analysis":"/api/acts/ad-cl-600-53-fuel-migration-and-centre-of-gravity-limit/analysis","conflicts":"/api/acts/ad-cl-600-53-fuel-migration-and-centre-of-gravity-limit/conflicts","importantCases":"/api/acts/ad-cl-600-53-fuel-migration-and-centre-of-gravity-limit/important-cases","documents":"/api/acts/ad-cl-600-53-fuel-migration-and-centre-of-gravity-limit/documents"}}