{"id":"F2006B02474","name":"AD/AS 355/18 - Main Rotor Sleeve Beams","slug":"ad-as-355-18-main-rotor-sleeve-beams","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41730,"registerId":"commonwealth-F2006B02474-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AS 355/18 - Main Rotor Sleeve Beams","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 355/18 Main Rotor Sleeve Beams 4/86 TX\n\n \n\nApplicability: All Model AS 355.\n\n \n\nRequirement: Inspect main rotor sleeve beams in accordance with Aerospatiale Telex Service Bulletin 01.12.\n\n \n\nCompliance: Before the next flight following discovery of a sudden or repetitive blade tracking problem.\n\n \n\nBackground:  The manufacturer reports cracking in the blade attachment area of the main rotor sleeve beams.\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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2119},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is the original issuance of the airworthiness directive. It establishes the initial safety requirement regarding main rotor sleeve beam inspections without deviation from the original safety purpose identified by the manufacturer."},"complexity_factors":["Single mechanical component addressed with no sub-conditions","Narrow applicability (one specific helicopter model series only)","Clear, single trigger for compliance (blade tracking problems)","Direct reference to one external technical standard (Service Bulletin)","No defined terms, exceptions, or nested conditional logic"],"plain_english_summary":"**What this does:**\nThis is a mandatory safety directive requiring immediate inspection of main rotor sleeve beams on specific Eurocopter helicopters when warning signs appear.\n\n**Who it affects:**\nOwners and operators of **Eurocopter AS 355 (Twin Ecureuil) series helicopters** in Australia.\n\n**What you must do:**\n- If you discover a **sudden or repetitive blade tracking problem** (where the rotor blades aren't rotating in the same plane), you must inspect the main rotor sleeve beams **before the next flight**.\n- The inspection must follow the procedures set out in **Aerospatiale Telex Service Bulletin 01.12**.\n\n**Why this matters:**\nThe manufacturer identified cracking in the blade attachment area of these sleeve beams. This is a critical safety issue—if these cracks progress unnoticed, they could cause main rotor failure and catastrophic loss of the aircraft. This directive acts as an emergency safeguard to catch the problem before it becomes deadly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-as-355-18-main-rotor-sleeve-beams","history":"/api/acts/ad-as-355-18-main-rotor-sleeve-beams/history","analysis":"/api/acts/ad-as-355-18-main-rotor-sleeve-beams/analysis","conflicts":"/api/acts/ad-as-355-18-main-rotor-sleeve-beams/conflicts","importantCases":"/api/acts/ad-as-355-18-main-rotor-sleeve-beams/important-cases","documents":"/api/acts/ad-as-355-18-main-rotor-sleeve-beams/documents"}}