{"id":"F2008L04570","name":"AD/CL-600/105 - Engine Throttle Control Gearbox","slug":"ad-cl-600-105-engine-throttle-control-gearbox","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":120892,"registerId":"commonwealth-F2008L04570-current","compilationNumber":null,"startDate":"2026-04-03","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-600/105 | Engine Throttle Control Gearbox | 1/2009 |\n| ------------- | ------------------------------- | ------ |\n\n| Applicability: | Bombardier CL-600-2A12 (CL601) and CL-600-2B16 (601-3A, 601-3R & CL604) Aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Revise the Transport Canada approved Maintenance Schedule as per the following:a) Incorporate Task 76-10-00-101 in Section 5-10-30 of PSP 601-5 TLMC, as introduced by TR 5-236 for CL601 variant.b) Incorporate Task 76-10-00-101 in Section 5-10-30 of PSP 601A-5 TLMC, as introduced by TR 5-236 for CL601-3A & 3R variants.c) Incorporate Task 76-11-00-101 in Section 5-10-40 of CL604 TLMC, as introduced by TR 5-2-40 for CL604 variant.Previous compliance with superseded TLMC TR 5-224 for variant CL 601, andTR 5-2-31 for variant CL604, satisfies the intention of this AD.Note: Transport Canada AD CF-2008-32R2 dated 17 November 2008 refers. |\n| Compliance:    | Within 30 days after the effective date of this AD.Initial compliance with the above-mentioned new TLMC tasks should be carried out in accordance with the Phase-in schedule as detailed in the applicable TRs 5-236 and TR 5-2-40.                                                                                                                                                                                                                                                                                                                                                                                                                           |\n|                | This Airworthiness Directive becomes effective on 15 January 2009.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| Background:    | There have been various reported incidents of throttle jam and engine shutdowns, caused by premature wear of the rack and pinion mechanism of part number (P/N) 2100140-005 and -007 Engine Throttle Control Gearbox (ETCG), installed on Bombardier CL-601 and 604 aircraft.Bombardier issued service bulletins (SB) 601-0583 (CL601/601-3A,-3R) and604-76-004 (CL 604), introducing periodic inspection of the affected ETCG rack and pinion mechanisms for wear.                                                                                                                                                                                           |\n\n|     | Subject inspection requirement tasks have now been incorporated into the applicable CL601 and CL604 Time Limits Maintenance Checks (TLMCs), through Temporary Revisions (TR), TR 5-236 (for CL601), TR 5-236 (for CL601-3A & -3R) andTR 5-2-40 (for CL604). |\n| --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n27 November 2008","sortOrder":0},{"sectionNumber":"AD/CL-600/105","sectionType":"part","heading":"AD/CL-600/105","content":"## AD/CL-600/105","sortOrder":1},{"sectionNumber":"Engine Throttle Control Gearbox","sectionType":"part","heading":"Engine Throttle Control Gearbox","content":"## Engine Throttle Control Gearbox","sortOrder":2},{"sectionNumber":"1/2009","sectionType":"part","heading":"1/2009","content":"## 1/2009","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD formalises incorporation of inspection tasks into existing TLMCs for the listed CL‑600 variants without expanding applicability beyond those models. It accepts prior compliance under superseded TRs, so it does not broaden scope of affected aircraft or impose additional substantive technical requirements beyond the new TLMC tasks (see Requirement; Compliance; Background)."},"complexity_factors":["Narrow technical focus limited to ETCG rack‑and‑pinion wear inspections","Applies to specific CL‑600 variants only (CL-600-2A12 and CL-600-2B16)","Requires formal revision of Transport Canada‑approved TLMCs via Temporary Revisions (TR 5-236 and TR 5-2-40)","30‑day compliance deadline with an additional phase‑in schedule for initial tasks","Acceptance of previous TLMC/TR compliance reduces operational disruption for some operators","Cross-reference to Transport Canada AD CF-2008-32R2 and Bombardier service bulletins increases regulatory linkage","Administrative burden falls on operators/maintenance organisations (schedule changes, record-keeping, inspections)","Low technical ambiguity but operational coordination required across fleet maintenance programs"],"plain_english_summary":"Requires operators of Bombardier CL-600-2A12 and CL-600-2B16 series aeroplanes to revise their Transport Canada‑approved Time Limits Maintenance Checks to add periodic inspections of the Engine Throttle Control Gearbox rack‑and‑pinion for wear — a mechanical change to detect causes of throttle jams and engine shutdowns. Operators pay the compliance cost, must update TLMCs and perform initial inspections within 30 days (phase‑in per the referenced TRs), and may rely on prior equivalent TLMC compliance where already done."},"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":3,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive addressing a specific safety-critical mechanical defect. The scope remains tightly focused on the engine throttle control gearbox issue as originally identified. The reference to multiple aircraft variants and maintenance manual updates reflects necessary technical specificity rather than scope creep."},"complexity_factors":["Multiple aircraft variants with slightly different compliance paths (CL601 vs CL601-3A/3R vs CL604)","References to external documents (Transport Canada AD CF-2008-32R2, Service Bulletins SB 601-0583 and 604-76-004, Temporary Revisions TR 5-236 and TR 5-2-40) that are not reproduced in full","Technical aviation terminology (ETCG, TLMC, P/N, TR, PSP) requiring specialized knowledge","Cross-referencing between task numbers (76-10-00-101 vs 76-11-00-101) and document sections (5-10-30 vs 5-10-40)","Conditional compliance provision (previous compliance with superseded TRs satisfies the new requirement)"],"plain_english_summary":"Owners and operators of Bombardier CL-600 series Challengers must, within 30 days, update approved maintenance programs to add new inspections of the Engine Throttle Control Gearbox (ETCG). The AD responds to premature rack-and-pinion wear that has caused throttle jams and unexpected engine shutdowns, posing serious flight safety risks. Effective 15 January 2009; earlier compliance with specified Temporary Revisions (TR 5-224 or TR 5-2-31) satisfies the requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-105-engine-throttle-control-gearbox","history":"/api/acts/ad-cl-600-105-engine-throttle-control-gearbox/history","analysis":"/api/acts/ad-cl-600-105-engine-throttle-control-gearbox/analysis","conflicts":"/api/acts/ad-cl-600-105-engine-throttle-control-gearbox/conflicts","importantCases":"/api/acts/ad-cl-600-105-engine-throttle-control-gearbox/important-cases","documents":"/api/acts/ad-cl-600-105-engine-throttle-control-gearbox/documents"}}