{"id":"F2006B08611","name":"AD/CL-600/49 Amdt 1 - Angle of Attack Transducer","slug":"ad-cl-600-49-amdt-1-angle-of-attack-transducer","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51540,"registerId":"commonwealth-F2006B08611-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CL-600/49 Amdt 1 - Angle of Attack Transducer","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\n \n\n \n\n\n\n AIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/CL- 600/49 and issues the following AD under subregulation 39.1 (1) of CASR 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 \n\n\n \n\nBombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\n \n\nAD/CL-600/49\n\nAmdt 1\n\n\nAngle of Attack Transducer 2/2005 DM\n\n \n\nApplicability: Model CL-600 “Challenger” aeroplanes listed in the following table:\n\n \n\n# Aeroplane Model Serial Number Range\n\n \n\nCL-600-1A11 (CL-600) CL-600-2A12 (CL-601)\n\nCL-600-2B16 (CL-601-3A/-3R) CL-600-2B16 (CL-604)\n\n\n1004 to 1085\n\n3001 to 3066\n\n5001 to 5194\n\n5301 to 5579\n\n \n\nRequirement: 1. Unless previously accomplished, amend the Aircraft Flight Manual (AFM) by inserting the applicable Temporary Revision (TR) detailed below:\n\n \n\n| Aeroplane Model | AFM | T/R |\n| --- | --- | --- |\n| CL-600-1A11 (CL-600) | PSP 600 DOT | 600/21 |\n| | PSP 600 | 600/20 |\n| | PSP 600-1 DOT | 600-1/17 |\n| | PSP 600-1-18 | 600-1/13 |\n|
CL–600-2A12 and |
PSP 601-1A |
601/25 |\n| CL-600-2B16 (CL-601) | PSP 601-1A-1 | 601/13 |\n| | PSP 601-1A-17 | 601/24 |\n| | PSP 601-1A-18 | 601/25 |\n| | PSP 601-1B | 601/17 |\n| | PSP 601-1B-1 | 601/12 |\n| | PSP 601A-1 | 601/23 |\n| | PSP 601A-1-1 | 601/22 |\n| | PSP 601A-1-17 | 601/22 |\n| | PSP 601A-1-18 | 601/21 |\n| | PSP 601A-1-18A | 601/24 |\n| | PSP 601A-1-20A | 601/15 |\n| CL-600-2B16 (CL-604) | PSP 604-1 | 604/9-5 |\n\n \n\nNote 1: Amendment of the AFM may have been accomplished in accordance with AD/CL-600/49 or Transport Canada AD CF-2002-05R1.\n\n \n\n2. Unless previously accomplished, carry out the checks specified in sub-paragraphs\n\n2.a. through 2.c. in accordance with paragraph 2.A. Aircraft Setup and paragraph\n\n2.B Part A - Special Check, of the Accomplishment Instructions of the following applicable Bombardier Aerospace Alert Service Bulletin (ASB) or later revisions approved by Transport Canada:\n\n \n\n# Aircraft Model ASB\n\n \n\nCL-600-1A11 (CL-600) CL-600-2A12 (CL-601)\n\nCL-600-2B16 (CL-601-3A/-3R) CL-600-2B16 (CL-604)\n\n\nA600-0715 dated 7 January 2002, or\n\nA600-0715 R1 dated 27 February 2004\n\nA601-0550 dated 7 January 2002, or\n\nA601-0550 R1 dated 27 February 2004\n\nA601-0550 dated 7 January 2002, or\n\nA601-0550 R1 dated 27 February 2004\n\nA604-27-011 dated 7 January 2002, or\n\nA604-27-011 R1 dated 27 February 2004\n\n \n\n1. Conduct a special check of both the left and right angle of attack (AOA) transducers and record the voltage and vane angle value results for the shaker and pusher firing angles.\n\n\n \n\nb. Assess the recorded voltages against the voltage tolerances specified in Table\n\n1.1 and Table 1.2 of Appendix A of the above referenced applicable ASB. If any of the voltages are outside of the specified tolerances, replace the unserviceable Stall Protection Computer and then repeat the initial special check of both the left and right AOA transducers as specified in Requirement\n\n2.a. Repeat the assessment of the recorded voltages as detailed above in this paragraph.\n\n \n\nc. Assess the recorded vane angles for the shaker and the pusher against the tolerances detailed in Table 1.1 and Table 1.2 of Appendix A. and, if required, against the expanded tolerances detailed in Table A of the Accomplishment Instructions of the above referenced applicable ASB.\n\n \n\n(i) If all of the recorded vane angles, for both AOA transducers, are within the tolerances in Table 1.1 and Table 1.2, the AOA transducers can remain in service and no further checks are required under Requirement\n\n2. However, compliance with Requirement 4 is required before the aircraft is returned to service.\n\n \n\n(ii) If one or more recorded vane angles for either or both of the AOA transducers is outside the tolerances in Table 1.1 and Table 1.2 of Appendix A but all recorded vane angles are within the expanded tolerances in Table A of the Accomplishment Instructions of the applicable ASB, replacement of the out-of-tolerance AOA transducer(s) may be delayed for 150 hours time in service (TIS) from the date that the check is carried out. Until Requirement 4 is completed, continue to comply with the applicable AFM TR, or later approved version, introduced under Requirement 1.\n\n \n\nNote 2: AOA special check may have been accomplished in accordance with AD/CL- 600/49 or Transport Canada AD CF-2002-05R1.\n\n \n\n3. If, as a result of the Requirement 2 checks, any of the recorded vane angles is outside the expanded tolerances in Table A of the applicable ASB, comply with Requirement 4.\n\n \n\n4. Remove any AOA transducer or transducer assembly that was not within the tolerances in Table 1.1 and 1.2 of Appendix A and install a new AOA transducer or transducer assembly. On each newly installed AOA transducer or transducer assembly, measure the AOA vane angles and voltage readings for shaker and pusher and ensure that the values are within the ranges specified. The foregoing shall be accomplished in accordance with paragraph 2.C. Part B of the Accomplishment Instructions of the applicable ASB as listed at Requirement 2.\n\n \n\n5. Remove the applicable AFM amendment introduced under Requirement 1 of this Directive.\n\n \n\n6. Amend the approved Maintenance Schedule by incorporating the Time Limits Maintenance Checks (TLMC) introduced by the following temporary revisions (TRs) to the appropriate Aircraft Maintenance Manuals (AMM):\n\n \n\nAeroplane Model\n\n \n\nCL-600-1A11 (CL-600) CL-600-2A12 (CL-601)\n\nCL-600-2B16 (CL-601-3A/-3R) CL-600-2B16 (CL-604)\n\n\nAMM\n\n \n\nPSP 605 TR 5-124 dated 27 February 2004\n\nPSP 601-5 TR 5-210 dated 27 February 2004\n\nPSP 601A-5 TR 5-228 dated 27 February 2004\n\nTLMC TR 5-2-16, dated 27 February 2004\n\n \n\nNote 3: Transport Canada AD CF-2002-05R1 refers.\n\n \n\nCompliance: For Requirement 1:\n\n \n\nAeroplanes with 300 or more hours time in service (TIS) since new - Within seven days of the effective date of this Directive, unless Requirement 4 of this Directive has been complied with.\n\n \n\nAeroplanes with less than 300 hours TIS at the effective date of this Directive - Before reaching 300 hours TIS unless Requirement 4 of this Directive has been complied with.\n\n \n\nFor Requirement 2:\n\n \n\nAeroplanes with more than 100 hours TIS since new - At or before accumulating 200 hours TIS from the effective date of this Amendment.\n\n \n\nAeroplanes with 100 hours TIS or less since new - At or before accumulating 300 hours TIS since new.\n\n \n\nFor Requirement 3 - Before further flight after the Requirement 2 check.\n\n \n\nFor Requirement 4 - Except as authorised under Requirement 2.c.(ii) above, before returning the aircraft to service following completion of the checks specified under Requirement 2.\n\n \n\nFor Requirement 5 - Following compliance with Requirement 4.\n\n \n\nFor Requirement 6 - Within 30 days after the effective date of this Amendment. This Amendment becomes effective on 22 December 2004.\n\nBackground: Bombardier Aerospace has determined that the potentiometers of the angle of attack transducers can develop flat spots which can cause a delay in the commands for stall warning, stick shaker and stick pusher operation. The problem is dormant and an out- of-tolerance AOA transducer can only be identified on an in service aircraft through introduction of a special check.\n\n \n\nThe original issue of this Directive required the amendment of the AFM and special checks of AOA transducers.\n\n \n\nThis Amendment amends the applicability for CL-604 aeroplanes, corrects the reference for the CL-604 AFM TR, deletes the repetitive AOA checks required by the original issue of this Directive and introduces an AOA check in the TLMC of the applicable AMM.\n\n \n\nThe original issue of this Airworthiness Directive became effective on 6 March 2002.\n\n \n\n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 16 December 2004\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 22 December 2004.\n","sortOrder":0}],"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"},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"The Amendment alters the original AD by expanding/correcting CL-604 applicability and AFM temporary revision references, deleting the repetitive AOA checks from the original AD, and instead introducing the AOA check into the Time Limits Maintenance Checks (TLMC) of the applicable AMMs. These changes are described in the Background and implemented via Requirements 1, 2 and 6 (Background; Requirement 6)."},"complexity_factors":["Multiple aircraft models and distinct serial-number ranges listed in the Applicability table, requiring operators to check if each aeroplane is covered (Applicability).","Layered mandatory actions: AFM amendment (Requirement 1), special measurements (Requirement 2), conditional immediate grounding if out-of-expanded-tolerance (Requirement 3), mandatory replacement before return-to-service (Requirement 4), AFM removal (Requirement 5), and AMM TLMC amendment (Requirement 6) — sequencing increases procedural complexity.","Technical measurement tolerances and data comparisons reference multiple tables in manufacturer ASBs (Table 1.1, Table 1.2, Appendix A and Table A), creating dependence on precise measurement and interpretation (Requirement 2; Appendix A of ASB).","Cross-references to specific Bombardier Alert Service Bulletins and their later revisions “approved by Transport Canada” introduce regulatory coordination and third-party approval dependency (Requirement 2).","Conditional allowances and limited deferral: replacement may be delayed up to 150 hours TIS if values fall within expanded tolerances, requiring operators to track TIS and comply with AFM temporary revisions until replacement (Requirement 2.c.(ii)).","Differentiated compliance windows based on aircraft time-in-service (TIS) since new for several requirements increases administrative tracking burden (Compliance section for Requirements 1 and 2).","Requirement to amend approved Maintenance Schedule and incorporate TLMC TRs within 30 days creates an ongoing maintenance-program obligation (Requirement 6; Compliance for Requirement 6).","Detection relies on a special in-service check because the problem is dormant and not readily apparent without the prescribed tests, adding operational risk if checks are missed (Background; Requirement 2).","Interaction with prior ADs and Transport Canada AD CF-2002-05R1 requires operators to reconcile previous compliance and records (Notes 1–3; Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of the listed Bombardier CL-600 Challenger aeroplanes to insert a specified temporary revision into the Aircraft Flight Manual, perform special checks of both left and right angle-of-attack (AOA) transducers using Bombardier Alert Service Bulletins, and replace any transducer outside tolerance. It also requires adding AOA checks into the maintenance time-limits schedule. The measures apply to specific serial-numbered aircraft and aim to detect and correct AOA potentiometer faults that can delay stall-warning and stick-shaker/pusher activation."},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":true,"description":"This Amendment 1 has evolved beyond the original directive's scope. The original AD (effective March 2002) required repetitive AOA checks. This amendment: (1) expands applicability to include CL-604 aircraft (serial numbers 5301-5579), (2) deletes the repetitive check requirement entirely, replacing it with a one-time check plus incorporation into routine Time Limits Maintenance Checks (TLMC), (3) corrects technical references for CL-604 documentation, and (4) introduces a new maintenance schedule amendment requirement (Requirement 6) that wasn't in the original. The shift from repetitive inspections to a scheduled maintenance program item represents a significant change in ongoing compliance burden and safety monitoring approach."},"complexity_factors":["Multiple aircraft models with different serial number ranges requiring different technical documents","Nested conditional logic: Requirement 2 contains sub-requirements 2.a, 2.b, 2.c, with 2.c containing further sub-clauses (i) and (ii) with different compliance paths","Cross-references to external documents: 4 different Alert Service Bulletins (ASBs), multiple Aircraft Flight Manual (AFM) temporary revisions, and Aircraft Maintenance Manual (AMM) temporary revisions","Variable compliance deadlines based on aircraft flight hours (Time in Service/TIS thresholds at 100, 200, and 300 hours)","Exception to exception structure: Requirement 2.c.(ii) allows delayed replacement (150 hours TIS extension) under specific tolerance conditions, creating a conditional deferral pathway","Interdependent requirements: Requirement 5 (removing AFM amendments) cannot be done until Requirement 4 is completed; Requirement 3 triggers Requirement 4 under certain conditions","Technical tolerance tables referenced but not reproduced in the directive (Table 1.1, 1.2, Table A from Appendix A)","Amendment structure that modifies, deletes, and adds to previous directive requirements"],"plain_english_summary":"This AD requires owners/operators of certain Bombardier CL‑600 series Challenger business jets to address a defect in angle‑of‑attack (AOA) transducer potentiometers that can cause delayed stick‑shaker/stick‑pusher warnings. \n\nIt mandates temporary flight manual revisions, targeted AOA sensor inspections and voltage/angle checks, replacement of out‑of‑tolerance sensors, and updates to maintenance checks within short deadlines to ensure timely stall warnings and prevent loss‑of‑control risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-49-amdt-1-angle-of-attack-transducer","history":"/api/acts/ad-cl-600-49-amdt-1-angle-of-attack-transducer/history","analysis":"/api/acts/ad-cl-600-49-amdt-1-angle-of-attack-transducer/analysis","conflicts":"/api/acts/ad-cl-600-49-amdt-1-angle-of-attack-transducer/conflicts","importantCases":"/api/acts/ad-cl-600-49-amdt-1-angle-of-attack-transducer/important-cases","documents":"/api/acts/ad-cl-600-49-amdt-1-angle-of-attack-transducer/documents"}}