{"id":"F2006B02498","name":"AD/AS 355/44 - Engine Fire Detection","slug":"ad-as-355-44-engine-fire-detection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41754,"registerId":"commonwealth-F2006B02498-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AS 355/44 - Engine Fire Detection","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\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Eurocopter AS 355 (Twin Ecureuil) Series Helicopters\n\n \n\nAD/AS 355/44 Engine Fire Detection 11/93 TX\n\n \n\nApplicability: AS 355 series helicopters versions E, F, F1, F2 and N.\n\n \n\nRequirement: Action in accordance with Eurocopter France Telex Service 26.03 (AS 355 versions E, F, F1 and F2 with Allison Engines) or Telex Service 26.04 (AS 355 version N).\n\n \n\nNote: DGAC AD 93-137-049(B) dated 18 August 1993 refers.\n\n \n\nCompliance: Within 25 flying hours after 30 August 1993.\n\n \n\nBackground:  The engine fire detection circuits may be incorrectly wired at the detector terminals, this could affect the proper operation of the fire detection system. Compliance with Directive will rectify the incorrect wiring and ensure the fire detection system operates properly.\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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive addresses a discrete wiring defect on the listed AS 355 variants and requires a one-off corrective action per the manufacturer telex within a short timeframe. There is no indication the AD broadens the set of affected aircraft or imposes ongoing obligations beyond the specified fix."},"complexity_factors":["Narrow technical scope: targets wiring on specific AS 355 variants (Applicability, Requirement)","Short, fixed compliance window increases operational scheduling pressure (Compliance: within 25 flying hours after 30 August 1993)","Procedural dependence on external manufacturer documents (Eurocopter Telex Services 26.03 / 26.04) for the corrective steps (Requirement)","Reference to a foreign authority directive (DGAC AD 93-137-049(B)) introduces cross-jurisdictional reliance (Note/Background)","Practical operational impacts: inspection/repair work may cause aircraft downtime and direct cost to operators (Compliance/Background)"],"plain_english_summary":"Mechanically, this airworthiness directive requires operators of Eurocopter AS 355 variants E, F, F1, F2 and N to inspect and, if necessary, correct engine fire-detection wiring in accordance with Eurocopter Telex Service 26.03 (Allison engines) or 26.04 (version N). The AD states miswired detector terminals could impair fire detection; compliance is required within 25 flying hours after 30 August 1993. Operators bear the cost and arrange the corrective work to restore proper system operation."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive addressing a specific manufacturing defect. It has not expanded beyond its original purpose of correcting a wiring fault in fire detection systems for a defined helicopter series."},"complexity_factors":["Single, specific technical requirement referencing external manufacturer documents","No defined terms section — uses plain operational language","Simple applicability test (aircraft model numbers only)","Single compliance deadline with clear trigger (25 flying hours post-30 August 1993)","No nested exceptions, conditional logic, or cross-references to other legislation","Background explanation provided in plain language"],"plain_english_summary":"This CASA Airworthiness Directive mandates correcting incorrect factory wiring in the engine fire detection system on certain Eurocopter AS 355 (E, F, F1, F2 with Allison engines, and N) helicopters. Affected owners/operators must carry out Eurocopter telex service instructions (26.03 or 26.04 as applicable) within 25 flight hours after 30 August 1993. It’s essential because faulty wiring could prevent timely fire warnings, risking catastrophic in-flight fires."}},"importantCases":[],"_links":{"self":"/api/acts/ad-as-355-44-engine-fire-detection","history":"/api/acts/ad-as-355-44-engine-fire-detection/history","analysis":"/api/acts/ad-as-355-44-engine-fire-detection/analysis","conflicts":"/api/acts/ad-as-355-44-engine-fire-detection/conflicts","importantCases":"/api/acts/ad-as-355-44-engine-fire-detection/important-cases","documents":"/api/acts/ad-as-355-44-engine-fire-detection/documents"}}