{"id":"F2006B08578","name":"AD/CL-600/19 - Fire Extinguishing Bottle Squib Wiring","slug":"ad-cl-600-19-fire-extinguishing-bottle-squib-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51417,"registerId":"commonwealth-F2006B08578-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CL-600/19 - Fire Extinguishing Bottle Squib Wiring","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBombardier (Canadair) CL-600 (Challenger) Series Aeroplanes\n\nAD/CL-600/19 Fire Extinguishing Bottle Squib Wiring 13/89\n\nApplicability: All CL 600-1A11 aircraft serial No 1004 through 1085.\n\nRequirement: 1. Perform a special check of the fire extinguisher system wiring in accordance with Canadair SB A600-0581.\n\n2. Modify the fire extinguisher system in accordance with Canadair SB A600-0581. Compliance: Requirement 1: Within 50 hours time in service after 28 December 1989.\n\nRequirement 2: Within 100 hours time in service after 28 December 1989.\n\nBackground: The current aircraft wiring configuration allows inadvertent cross connection of the fire extinguisher squibs during maintenance. This could result in extinguishing agent being directed to the wrong engine in the event of a fire.\n\nCompliance with Requirement 1 will validate the current aircraft configuration, whilst compliance with Requirement 2 will eliminate the possibility of any future cross connections.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD’s scope aligns with its stated purpose in Background: first to validate existing wiring, then to eliminate cross‑connection risk. It targets a defined subset of CL‑600‑1A11 airframes and prescribes inspection plus modification consistent with that intent."},"complexity_factors":["Narrow applicability: specific aircraft model and serial numbers (Applicability: serial No 1004 through 1085).","Two-step compliance timetable with short deadlines (Requirement 1: 50 hours; Requirement 2: 100 hours after 28 December 1989).","Requires following a manufacturer service bulletin for both inspection and modification (Canadair SB A600-0581).","Safety‑critical wiring work affecting fire suppression systems increases procedural and certification checks.","Small fleet size reduces logistical complexity but concentrates cost and scheduling burdens on affected operators."],"plain_english_summary":"This airworthiness directive requires operators of Bombardier CL-600-1A11 aircraft serial Nos 1004–1085 to perform a special check and then modify the fire‑extinguisher squib wiring using Canadair Service Bulletin A600‑0581 (Requirement 1: check within 50 hours; Requirement 2: modify within 100 hours after 28 Dec 1989). It addresses a wiring configuration that can allow inadvertent cross‑connection of squibs so that extinguishing agent might be sent to the wrong engine. Operators must carry out and fund the work; the regulator mandates compliance and the manufacturer SB prescribes technical steps."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It addresses a specific wiring defect in a specific aircraft model with a targeted technical fix. There is no evidence of scope creep; the directive remains tightly focused on the fire extinguisher squib wiring issue as originally identified."},"complexity_factors":["Single, specific aircraft type and narrow serial number range (1004-1085)","Only two requirements with clear timeframes (50 and 100 hours)","No defined terms section — references external technical document (Canadair Service Bulletin) without reproducing it","No conditional logic, exceptions, or nested provisions","Straightforward cause-and-effect: identified hazard → inspection → modification","Total length: approximately 200 words"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order for aircraft owners and operators.\n\n**What it does:**\nOrders owners of specific Bombardier Challenger 600 series jets to inspect and modify the wiring for their fire extinguishing systems.\n\n**The safety problem:**\nThe wiring for the fire extinguisher \"squibs\" (small explosive charges that trigger the fire suppression system) was designed in a way that maintenance crews could accidentally cross-wire them. This means if the left engine caught fire, the extinguisher might spray into the *right* engine instead — or nowhere useful. That's obviously bad if you're on fire at 35,000 feet.\n\n**Who must comply:**\nAnyone operating CL-600-1A11 aircraft with serial numbers 1004 through 1085 (specific early production models).\n\n**What they must do:**\n- **First check:** Within 50 flight hours after 28 December 1989, inspect the wiring per the manufacturer's service bulletin to confirm whether cross-connections exist.\n- **Permanent fix:** Within 100 flight hours after that same date, modify the wiring to prevent any future cross-connections.\n\n**Why it matters:**\nThis is a life-safety issue. A fire in one engine that triggers the wrong extinguisher bottle could leave the actual fire burning while wasting the suppression agent. The directive forces a one-time inspection and permanent redesign to eliminate the wiring error risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cl-600-19-fire-extinguishing-bottle-squib-wiring","history":"/api/acts/ad-cl-600-19-fire-extinguishing-bottle-squib-wiring/history","analysis":"/api/acts/ad-cl-600-19-fire-extinguishing-bottle-squib-wiring/analysis","conflicts":"/api/acts/ad-cl-600-19-fire-extinguishing-bottle-squib-wiring/conflicts","importantCases":"/api/acts/ad-cl-600-19-fire-extinguishing-bottle-squib-wiring/important-cases","documents":"/api/acts/ad-cl-600-19-fire-extinguishing-bottle-squib-wiring/documents"}}