{"id":"F2008L03619","name":"AD/CL-600/98 Amdt 1 - Enhancement to Takeoff Operational Safety Margins","slug":"ad-cl-600-98-amdt-1-enhancement-to-takeoff-operational-safety-margins","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":75263,"registerId":"commonwealth-F2008L03619-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-600/98 Amdt 1 | Enhancement to Takeoff Operational Safety Margins | 12/2008 DM |\n| ------------------- | ------------------------------------------------- | ---------- |\n\n| Applicability: | Bombardier Inc. CL-600-1A11, CL-600-2A12 and CL-600-2B16 aircraft. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. a. Amend the Aircraft Flight Manual (AFM) by inserting the following Temporary Revisions, as applicable:CL-600-1A11 (CL-600):PSP 600 (DOT) TR 600/26-2, dated 07 August 08PSP 600-1 (DOT) TR 600-1/22-2, dated 07 August 08CL-600-2A12 (CL-601):PSP 601-1A TR 601/30-2, dated 07 August 08PSP 601-1A-1 TR 601/18-2, dated 07 August 08PSP 601-1B TR 601/22-2, dated 07 August 08PSP 601-1B-1 TR 601/17-2, dated 07 August 08CL-600-2B16 (CL-601-3A/3R):PSP 601A-1 TR 601/29-2, dated 07 August 08PSP 601A-1-1 TR 601/30-2, dated 07 August 08CL-600-2B16 (CL-604):PSP 604-1 TR 604/24-2, dated 07 August 08CL-600-2B16 (CL-605):PSP 605-1 TR 605/1-2, dated 07 August 08b. Insert a copy of this Airworthiness Directive in the AFM.Note 1: This AD is applicable to all Challenger CL-600, 601, 601-3A/3R, 604 and 605 models. If the operator has an AFM that is not listed above, consult Bombardier Aerospace.c. Advise all flight crews on the changes introduced through the AFM TR; and,2. Review the “Pilot’s Checklist” to ensure that the instructions regarding selection of the wing anti-ice system to “ON”, as specified in the AFM Limitations Section, are incorporated. |\n\n| | Note 2: Canadian Airworthiness Directive No. CF-2008-16R1 dated 20 August 2008 refers. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | Within 14 days after the effective date of this directive. |\n| | This Amendment becomes effective on 6 October 2008. |\n| Background: | Following three recent events where Bombardier CL-600-2B19/CL-600-2B16 aircraft experienced un-commanded roll during take-off, it has been determined that it is necessary to further enhance the AFM limitations and procedures to ensure safe operation, particularly in cold weather or icing conditions.This AD mandates the introduction of additional limitations and procedures to the current AFM and requires that any Operators’ Pilot’s checklists fully reflect these procedures. In order not to compromise the takeoff operational safety margin, strict adherence to all the AFM procedures and limitations is required.This amendment introduces the latest revision to the AFM. The latest AFM revision requires specific pilot training with regard to enhanced take-off procedures and winter operations.The original issue of this AD became effective 13 March 2008. |\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n30 September 2008","sortOrder":0},{"sectionNumber":"AD/CL-600/98 Amdt 1","sectionType":"part","heading":"AD/CL-600/98 Amdt 1","content":"## AD/CL-600/98 Amdt 1","sortOrder":1},{"sectionNumber":"Enhancement to Takeoff Operational Safet","sectionType":"part","heading":"Enhancement to Takeoff Operational Safety Margins","content":"## Enhancement to Takeoff Operational Safety Margins","sortOrder":2},{"sectionNumber":"12/2008 DM","sectionType":"part","heading":"12/2008 DM","content":"## 12/2008 DM","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose of enhancing takeoff safety margins for CL-600 series aircraft following icing-related incidents. It updates the previous March 2008 directive with revised flight manual temporary revisions and additional training requirements, but does not expand beyond the original safety intent."},"complexity_factors":["Multiple aircraft variants listed with specific temporary revision numbers (8 different TR documents across 5 model variants)","Cross-reference to Canadian Airworthiness Directive CF-2008-16R1","Nested requirements: amendment of AFM, insertion of AD copy, crew briefing, and checklist review","Technical aviation terminology (AFM, TR, PSP, wing anti-ice system) assumes industry knowledge","Conditional applicability note requiring consultation with manufacturer for non-standard manuals"],"plain_english_summary":"This mandatory CASA Airworthiness Directive affects Bombardier Challenger CL‑600/601/604/605 operators and requires inserting temporary AFM revisions (dated 7 Aug 2008), briefing pilots on revised cold‑weather/icing takeoff procedures, and ensuring checklists direct wing anti‑ice to ON as per the AFM.\n\nThe changes, to be implemented within 14 days of the AD (effective 6 Oct 2008), address three incidents of unexpected roll during takeoff and aim to restore safe takeoff margins in icing conditions."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment updates and tightens the original AD’s documentary and procedural requirements (new AFM Temporary Revisions, explicit crew notification and a checklist review) but stays within the original safety-focused purpose (enhancing takeoff safety margins after uncommanded roll events). It does not materially broaden the regulatory scope beyond the original safety objective or add unrelated regulatory effects; it requires operators to adopt the latest AFM TRs and associated training, rather than expanding applicability to new aircraft types or introducing economic regulation."},"complexity_factors":["Short directive focused on a limited set of documentary and procedural actions","Lists multiple Temporary Revisions across several model variants (nine TR identifiers across CL-600/601/601-3/604/605 variants)","Four discrete requirements (insert TRs, insert AD copy, advise crews, review checklist) with a single short compliance window (14 days)","Cross-reference to a foreign (Canadian) Airworthiness Directive (CF-2008-16R1)","Some operational complexity implicit in AFM changes (performance specifics left to AFM rather than repeated in the AD) which requires operators to consult the AFM for technical detail"],"plain_english_summary":"**What this instrument does (mechanically)\n\n- Requires operators of Bombardier Challenger CL-600 series aeroplanes (models CL-600-1A11, CL-600-2A12, CL-600-2B16 and related variants) to update their Aircraft Flight Manual (AFM) by inserting specified Temporary Revisions (TRs) and to insert a copy of this Airworthiness Directive (Requirement 1.a–1.b).\n- Requires operators to advise all flight crews of the AFM changes introduced by those TRs (Requirement 1.c).\n- Requires operators to review their Pilot’s Checklist to ensure the AFM instruction that the wing anti-ice system be selected ON (as specified in the AFM Limitations section) is actually present in the checklist (Requirement 2).\n- Sets a 14-day compliance deadline from the directive’s effective date for completing the above actions (Compliance).\n\n**Who this affects\n\n- Aircraft operators (airlines, charter companies, business-jet operators) who operate the listed Challenger CL-600 family aeroplanes. Operators must update documentation, brief crews and may need to provide pilot training noted in the AFM revisions.\n- Flight crew members, who must follow the revised AFM procedures and ensure checklists reflect the new instructions.\n- Maintenance/continuing airworthiness personnel, who must manage the AFM insertion and maintain compliance records.\n\n**Why it matters (stated purpose and the intervention’s mechanics)\n\n- The directive follows three uncommanded roll events during take-off on certain Challenger variants. The stated purpose is to enhance takeoff operational safety margins, particularly in cold-weather or icing conditions, by tightening AFM limitations and procedures and ensuring pilot awareness and checklist compliance (Background).\n- Mechanically, the intervention forces immediate administrative changes (AFM TR insertion and checklist amendment), and operational changes insofar as crews must adopt the revised procedures (for example, selecting wing anti-ice ON as required by the AFM). The AFM revisions also require specific pilot training about enhanced takeoff and winter procedures (Requirement text and Background).\n\n**Practical effects, costs and trade-offs (analyst’s lens)\n\n- Who pays: operators bear the direct costs — updating AFMs, distributing the AD, briefing crews, and any training costs. These are one-off administrative/training expenses but could include recurring costs if revised procedures change routine operations.\n- Operational trade-offs: requiring wing anti-ice ON for takeoff in relevant conditions can alter takeoff performance (increased drag, possible changes to takeoff speeds or reduced allowable takeoff weight). Operators may face indirect costs such as reduced payload, altered fuel planning, or scheduling impacts if performance limits are tightened. The AFM revisions typically specify performance numbers; operators must apply them (Requirement 1.a, Requirement 2).\n- Compliance burden and timing: the 14-day deadline is short, so operators must act quickly to insert the TRs, amend checklists and brief crews. That creates administrative pressure and may require rapid briefing/training sessions.\n- Enforcement and decision-making: compliance is enforced by the Civil Aviation Safety Authority (CASA) via the AD; operators remain responsible for ensuring their crews and documentation conform. Pilots must follow the AFM and checklists in flight operations.\n- Risk and implementation: the measure reduces the specific risk identified (uncommanded roll in takeoff/icing conditions) by changing procedures and mandating training. Implementation risk arises from incomplete checklist adoption, inadequate briefing/training, or operational pressure to bypass new limits. There is no removal of operator discretion to adopt more conservative practices; the AD imposes minimum mandatory changes.\n- Market effects: the directive does not change ownership, competition rules or market access. It imposes compliance costs on operators of the affected fleet; smaller operators with less administrative capacity may find the short compliance window more burdensome. There are no direct subsidies, fees or transfers described.\n\n**Source claims vs. costs and incentives\n\n- The stated safety intent (preventing uncommanded roll during takeoff in cold or icing conditions) is directly addressed by procedural and training changes in the AFM and by checklist amendments (Background and Requirement). Those measures produce safety benefits concentrated on crews and passengers of affected aircraft.\n- Costs are diffuse across operators and include administrative updates, crew training and potential operational performance impacts (e.g. payload restrictions, conservative dispatch in cold/icing conditions). The directive creates a clear incentive for operators to update procedures and train crews; it also raises the opportunity cost of marginal payload or scheduling choices when revised performance limits apply.\n\n**References within the directive\n\n- The AD lists specific AFM Temporary Revisions by aircraft variant to be inserted (Requirement 1.a) and cross-references Canadian AD CF-2008-16R1 (Note 2). Compliance timing and the effective date are stated in the Compliance section.\n\nOverall, the instrument is a focused safety directive: it mandates rapid AFM and checklist changes plus crew notification/training to mitigate specific takeoff risks identified in several events. Operators must act quickly and may face operational impacts from revised performance and procedural requirements."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-98-amdt-1-enhancement-to-takeoff-operational-safety-margins","history":"/api/acts/ad-cl-600-98-amdt-1-enhancement-to-takeoff-operational-safety-margins/history","analysis":"/api/acts/ad-cl-600-98-amdt-1-enhancement-to-takeoff-operational-safety-margins/analysis","conflicts":"/api/acts/ad-cl-600-98-amdt-1-enhancement-to-takeoff-operational-safety-margins/conflicts","importantCases":"/api/acts/ad-cl-600-98-amdt-1-enhancement-to-takeoff-operational-safety-margins/important-cases","documents":"/api/acts/ad-cl-600-98-amdt-1-enhancement-to-takeoff-operational-safety-margins/documents"}}