{"id":"F2006B08621","name":"AD/CL-600/58 - Aileron Stiffness","slug":"ad-cl-600-58-aileron-stiffness","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51582,"registerId":"commonwealth-F2006B08621-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CL-600/58 - Aileron Stiffness","content":"![](image.001.png)\n\n![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/CL-600/58 and issues the following 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\n\nAD/CL-600/58\n\nAmdt 1\n\n  \n\nAileron Stiffness 10/2002 DM\n\nApplicability: All CL-600-2B19 aircraft.\n\nRequirement: 1. Amend the Aircraft Flight Manual (AFM) by inserting Temporary Revision (TR) RJ/109-2 dated 9 August 2002. TR RJ/109-2 introduces the following:\n\n    An amendment to Emergency Procedures for aileron system jams. This change is applicable to all aircraft.\n\n    b. An aileron control check procedure to the Limitations Section. This change is applicable to aircraft that have accumulated 5,000 total flight hours.\n    2. Insert a copy of this Directive in each AFM.\n\n    3. Advise all flight crews on the changes introduced through the AFM TR.\n\nNote: Transport Canada AD CF-2002-35R1 refers.\n\nCompliance: Within 14 days after 28 August 2002, unless already accomplished.\n\nThis amend ment becomes effective on 28 August 2002.\n\nBackground: A significant number of reports of aileron control stiffness have been received following climb to altitude after takeoff from a contaminated runway or during heavy rain. In every case, the aileron stiffness disappeared upon descent to lower altitude and the aircraft landed safely. The aircraft that have encountered aileron control stiffness had accumulated in excess of 5,000 total flight hours when the problem appeared.\n\nBombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\nAD/CL-600/58 Amdt 1 (continued)\n\nAmendment 1 is issued in response to a revision of the related Transport Canada AD which introduces an amended AFM TR which increases the minimum altitude for commencement of the aileron control checks.\n\nThe original issue of this Airworthiness Directive became effective on 7 August 2002.\n\n![Signature of David Alan Villiers Delegate of the Civil Aviation Safety Authority](image.002.jpeg)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 21 August 2002\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 28 August 2002.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment does not expand the subject matter beyond the original safety purpose. Amendment 1 revises the previously issued AFM Temporary Revision to increase the minimum altitude for commencing the aileron control checks and otherwise clarifies procedural requirements; it remains a targeted, procedural safety measure addressing reported aileron stiffness on high-hour CL-600-2B19 aircraft rather than introducing new categories of regulated activity or wider obligations."},"complexity_factors":["Short document with 3 core operator requirements (AFM insertion, AFM copy retention, crew briefing).","Single aircraft type applicability: CL-600-2B19 (all aircraft of this model).","One conditional measure: aileron control check applies only to aircraft with >5,000 total flight hours.","Cross-reference to a single related foreign AD (Transport Canada AD CF-2002-35R1 / related TR).","Clear, single compliance deadline: within 14 days after 28 August 2002.","No technical modifications or complex inspection protocols mandated — procedural change only."],"plain_english_summary":"**What this directive does (mechanically)\n\n- Requires operators of Bombardier (Canadair) CL-600-2B19 (Challenger) aeroplanes to update their Aircraft Flight Manual (AFM) by inserting Temporary Revision (TR) RJ/109-2 dated 9 August 2002. (Requirement 1)\n- The TR adds an amended emergency procedure for aileron system jams that applies to all affected aircraft, and it adds an aileron control check procedure to the AFM Limitations section for aircraft that have more than 5,000 total flight hours. (Requirement 1a–1b)\n- Requires that a copy of this Airworthiness Directive be placed in each AFM. (Requirement 2)\n- Requires that all flight crews be advised of the AFM changes. (Requirement 3)\n- Operators had to comply within 14 days after 28 August 2002 (i.e. the compliance window specified). (Compliance)\n\n**Who this affects\n\n- Operators and owners of all Bombardier CL-600-2B19 aircraft.\n- The aileron control check requirement specifically targets aircraft with more than 5,000 total flight hours.\n- Flight crews who must be briefed on and follow the new AFM emergency and check procedures.\n\n**Why it matters (stated reason and practical effect)\n\n- The directive responds to multiple reports of aileron control stiffness experienced after climb following take-off from contaminated runways or during heavy rain. The stiffness reportedly disappeared on descent and no accidents were recorded. The problem has been observed on aircraft with more than 5,000 total flight hours. (Background)\n- Mechanically, the AD does not order structural or hardware modification; it imposes procedural changes (AFM emergency procedure and a control-check limitation) and requires operator notification and AFM insertion. These are intended to reduce operational risk by changing crew response and limiting operations until checks are performed. (Requirement)\n\n**Costs, incentives and trade-offs (practical analysis)\n\n- Direct costs: primarily administrative and training — updating the AFM, distributing the TR, and briefing flight crews. No mandatory physical maintenance or parts replacement is required by this AD.\n- Operational effect: crews must perform and follow the new emergency and control-check procedures. For aircraft over 5,000 hours, a new control-check step is added to the Limitations section; that may slightly change pre-flight or climb procedures and could impose minimal time or operational constraints.\n- Compliance burden and timing: the compliance window is short (14 days after 28 August 2002), which concentrates implementation effort on operators in that period. That short deadline raises the cost of rapid administrative action but does not impose ongoing monitoring beyond routine operations and training.\n- Incentives: the rule targets higher-hour aircraft (a 5,000-hour threshold). That creates an incentive for operators of older/higher-utilisation airframes to pay particular attention to the check procedures and possibly to schedule additional inspections or earlier maintenance if problems are found. It does not mandate inspections or technical fixes, so any escalation to maintenance is left to operator judgment and maintenance rules.\n- Implementation risk: effectiveness depends on crew compliance with the AFM TR and on operators keeping the AFM and crew briefings current. The AD relies on procedures rather than on hardware fixes, so if the root cause is maintenance- or component-related, the procedural TR may reduce operational risk but not eliminate the underlying fault.\n- Interaction with overseas rules: the AD cross-references Transport Canada AD CF-2002-35R1 and follows an amended Transport Canada TR, so it harmonises Australian requirements with the Canadian regulator's actions. (Note; Background/Amendment)\n\n**Summary statement of consequences\n\n- Who pays: aircraft operators (administrative/training costs, and any follow-up inspections they choose to perform).\n- Who decides in practice: CASA enforces the AD; operators decide whether to take additional maintenance action beyond the procedural measures.\n- Behaviour change required: insert the TR in the AFM, brief crews, and carry out the new aileron-control check procedure on aircraft over 5,000 hours when the conditions prompting the check apply.\n\n(References: Requirement 1–3, Compliance, Background, Amendment text explaining the AFM TR change.)"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific aileron stiffness issue in a specific aircraft type. Amendment 1 merely updates the technical requirements in response to a revised Canadian directive, without expanding the aircraft types covered or the nature of the safety measures required."},"complexity_factors":["Short, single-purpose instrument (approximately 400 words)","Only 4 defined structural elements (Applicability, Requirement, Compliance, Background)","Minimal cross-referencing — only one external reference to Transport Canada AD CF-2002-35R1","Simple conditional logic: applies to 'all' aircraft in the series, with one sub-requirement (the aileron control check) limited to aircraft with >5,000 flight hours","No nested exceptions or complex definitional provisions","Clear, sequential compliance instructions","Amendment structure is straightforward (replaces previous version, explains the change in one sentence)"],"plain_english_summary":"This AD revokes and replaces the previous order for Bombardier CL-600-2B19 Challengers, requiring operators to insert a temporary AFM revision adding emergency procedures for aileron jams, add a control preflight check for aircraft >5,000 flight hours, insert the Directive into the AFM, and brief crews. \n\nIt responds to incidents of stiff/jammed ailerons after takeoff from wet/contaminated runways at high altitude that could impair control. Compliance: within 14 days of 28 Aug 2002."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-58-aileron-stiffness","history":"/api/acts/ad-cl-600-58-aileron-stiffness/history","analysis":"/api/acts/ad-cl-600-58-aileron-stiffness/analysis","conflicts":"/api/acts/ad-cl-600-58-aileron-stiffness/conflicts","importantCases":"/api/acts/ad-cl-600-58-aileron-stiffness/important-cases","documents":"/api/acts/ad-cl-600-58-aileron-stiffness/documents"}}