{"id":"F2006B02494","name":"AD/AS 355/40 - Emergency Locator Transmitter Antenna","slug":"ad-as-355-40-emergency-locator-transmitter-antenna","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41750,"registerId":"commonwealth-F2006B02494-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AS 355/40 - Emergency Locator Transmitter Antenna","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 355/40 Emergency Locator Transmitter Antenna 10/92\n\nApplicability: All AS 355 helicopters, versions E, F, F1 and F2, fitted with a “Jolliet” emergency locator transmitter antenna, not modified per AMS 350A.07.2492 (Eurocopter France Service Bulletin AS 355 No 25.31 dated 30 March 1992).\n\n \n\nRequirement: Modify the antenna in accordance with Eurocopter France Service Bulletin AS 355 No 25.33 dated 2 June 1992.\n\n \n\nNote: DGAC AD 92-142-045(B) dated 8 July 1992 refers.\n\n \n\nCompliance: Within 400 hours time in service from 17 September 1992 or by 1 April 1993, whichever occurs first.\n\n \n\nBackground:  Compliance with this Directive improves the antenna resistance to vibrations and reduces the risk of loss in flight.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with a single purpose. It has not expanded beyond its original intent of mandating a specific antenna modification."},"complexity_factors":["Single, specific technical requirement with clear reference to manufacturer service bulletin","Limited applicability: only 4 helicopter variants with one specific antenna model","Simple compliance deadline structure (hours OR calendar date, whichever first)","No defined terms section, no cross-references to other legislation beyond a single note","No conditional logic, exceptions, or nested provisions","Total length: approximately 150 words of substantive content"],"plain_english_summary":"This CASA Airworthiness Directive orders operators of Eurocopter AS355 E/F/F1/F2 helicopters with the “Jolliet” ELT antenna to modify or replace it per the manufacturer’s service instructions. The antenna’s vibration issue can detach and disable the emergency locator, hindering search-and-rescue. Compliance was required by either 400 flight hours after 17 Sep 1992 or by 1 Apr 1993, closing a safety gap identified by DGAC and the manufacturer."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope unchanged: the directive applies only to the specified AS 355 subtypes fitted with the named ELT antenna and not previously modified per AMS 350A.07.2492. It enforces a single technical modification to reduce vibration-related antenna failure, consistent with the document's stated purpose."},"complexity_factors":["Narrow technical applicability: only AS 355 versions E, F, F1 and F2 fitted with a “Jolliet” ELT antenna that has not been modified per AMS 350A.07.2492 (Applicability).","Prescriptive technical action: mandates modification per Eurocopter Service Bulletin AS 355 No 25.33 dated 2 June 1992 (Requirement).","Firm compliance deadline: within 400 hours time in service from 17 September 1992 or by 1 April 1993, whichever occurs first (Compliance).","Operator bears implementation cost and scheduling burden: requires physical maintenance/modification work on aircraft (Requirement/Compliance).","Dependence on external manufacturer material for detailed procedure: technical content and steps are located in the referenced service bulletin (Requirement).","Cross-reference to a foreign authority directive (DGAC AD 92-142-045(B)) indicating alignment with another regulator’s corrective action (Note).","No alternative methods of compliance or exemptions stated in the text, limiting discretion for operators within the AD itself (absence in Requirement/Compliance)."],"plain_english_summary":"This airworthiness directive requires owners/operators of Eurocopter AS 355 E/F/F1/F2 helicopters fitted with an unmodified “Jolliet” emergency locator transmitter (ELT) antenna to modify that antenna in accordance with Eurocopter Service Bulletin AS 355 No 25.33 (2 June 1992). The work must be completed within 400 flight hours from 17 September 1992 or by 1 April 1993. The stated purpose is to increase vibration resistance and reduce the risk of the antenna becoming lost in flight, which creates a maintenance cost and scheduling obligation for operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-as-355-40-emergency-locator-transmitter-antenna","history":"/api/acts/ad-as-355-40-emergency-locator-transmitter-antenna/history","analysis":"/api/acts/ad-as-355-40-emergency-locator-transmitter-antenna/analysis","conflicts":"/api/acts/ad-as-355-40-emergency-locator-transmitter-antenna/conflicts","importantCases":"/api/acts/ad-as-355-40-emergency-locator-transmitter-antenna/important-cases","documents":"/api/acts/ad-as-355-40-emergency-locator-transmitter-antenna/documents"}}