{"id":"F2006B08603","name":"AD/CL-600/41 - Fire Warning Control Unit","slug":"ad-cl-600-41-fire-warning-control-unit","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51506,"registerId":"commonwealth-F2006B08603-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \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.","sortOrder":0},{"sectionNumber":"AD/CL-600/41 Fire Warning Control Unit 3","sectionType":"part","heading":"AD/CL-600/41 Fire Warning Control Unit 3/2001","content":"# AD/CL-600/41 Fire Warning Control Unit 3/2001\n\nDM\n\nApplicability: CL-600-2B19 “Regional Jet” aircraft, serial numbers 7003 through 7067, 7069 through 7422.\n\nRequirement: Install protective sealing tape to the Fire and Overheat Control Unit in accordance with Bombardier Alert Service Bulletin A601R-26-017, Revision A.\n\nNote: Transport Canada AD CF-2000-35 refers.\n\nCompliance: Within 250 flying hours or 30 days after the effective date of this Airworthiness Directive, whichever occurs first.\n\nThis Airworthiness Directive becomes effective on 21 February 2001.\n\nBackground: Investigation into false engine and APU fire warnings determined the cause to be fluid contamination in the fire and overheat control unit.\n\n![Signature of Eugene Paul Holzapfel Delegate of the Civil Aviation Safety Authority](image.003.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 9 February 2001\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 21 February 2001.","sortOrder":1}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1503},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains a precise, targeted scope addressing the specific unsafe condition (fluid contamination causing false fire warnings) in the identified aircraft fleet. There is no evidence of scope expansion beyond the original safety investigation findings."},"complexity_factors":["Single, unambiguous mechanical action required (installing sealing tape)","Narrow applicability limited to specific aircraft model and serial number ranges","No nested exceptions, conditional logic, or discretionary provisions","Binary compliance trigger (flying hours OR calendar days)","Reliance on external technical reference (manufacturer's Service Bulletin) rather than detailed legislative drafting"],"plain_english_summary":"**What this is:** A mandatory safety order (Airworthiness Directive) for specific Bombardier Regional Jet aircraft.\n\n**The problem:** The fire warning system can trigger false alarms because fluids can leak into the Fire and Overheat Control Unit, potentially distracting pilots during flight.\n\n**Who must act:** Owners or operators of CL-600-2B19 \"Regional Jet\" aircraft with serial numbers 7003 through 7067, and 7069 through 7422.\n\n**What must be done:** Install protective sealing tape on the Fire and Overheat Control Unit, following the manufacturer's instructions in Bombardier Alert Service Bulletin A601R-26-017 (Revision A).\n\n**Deadline:** Complete the fix within **250 flying hours** or **30 days after 21 February 2001**, whichever happens first.\n\n**Why it matters:** This prevents false fire warnings that could lead to unnecessary emergency shutdowns, while ensuring the system still detects real fires."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-41-fire-warning-control-unit","history":"/api/acts/ad-cl-600-41-fire-warning-control-unit/history","analysis":"/api/acts/ad-cl-600-41-fire-warning-control-unit/analysis","conflicts":"/api/acts/ad-cl-600-41-fire-warning-control-unit/conflicts","importantCases":"/api/acts/ad-cl-600-41-fire-warning-control-unit/important-cases","documents":"/api/acts/ad-cl-600-41-fire-warning-control-unit/documents"}}