{"id":"F2006B04706","name":"AD/BELL 47/84 - Frame Stiffening Assembly 660-2001-1 - Inspection","slug":"ad-bell-47-84-frame-stiffening-assembly-660-2001-1-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44470,"registerId":"commonwealth-F2006B04706-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 47/84 - Frame Stiffening Assembly 660-2001-1 - Inspection","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)  Bell Helicopter Textron 47 (All Variants) Series Helicopters\n\n \n\n# AD/BELL 47/84 Frame Stiffening Assembly 660-2001-1 - Inspection\n\nApplicability: All models 47G equipped with Soloy turbine conversion. Document:  Soloy Conversions Limited SB 12-660.\n\nCompliance: Within 100 hours time in service after 31 March 1981.\n\n# 3/81\n\n \n\nBackground:  There is a possibility that the tubes comprising the stiffener assembly may not have received interior treatment.\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":1795},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, targeted safety directive addressing a specific manufacturing defect in a particular helicopter modification. The scope remains tightly focused on the identified airworthiness issue."},"complexity_factors":["Single, unambiguous applicability criterion (Bell 47G with Soloy turbine conversion)","One specific part number identified (660-2001-1)","Simple compliance deadline (100 hours time in service after fixed date)","No exceptions, conditions, or alternative compliance methods","Refers to external technical document for detailed procedure"],"plain_english_summary":"**What this is:** A mandatory safety inspection order (called an Airworthiness Directive) for certain Bell 47 helicopters.\n\n**Who it affects:** Owners and operators of Bell 47G helicopters that have been modified with Soloy turbine engine conversions.\n\n**What must be done:** Inspect the \"Frame Stiffening Assembly\" (part number 660-2001-1) to check if the tubes inside it received proper interior treatment during manufacturing.\n\n**Why:** There was a risk that the tubes were not properly treated on the inside, which could lead to corrosion or structural weakness.\n\n**When:** The inspection had to be completed within 100 hours of flying time after 31 March 1981.\n\n**How:** Follow the instructions in Soloy Conversions Limited Service Bulletin 12-660."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-47-84-frame-stiffening-assembly-660-2001-1-inspection","history":"/api/acts/ad-bell-47-84-frame-stiffening-assembly-660-2001-1-inspection/history","analysis":"/api/acts/ad-bell-47-84-frame-stiffening-assembly-660-2001-1-inspection/analysis","conflicts":"/api/acts/ad-bell-47-84-frame-stiffening-assembly-660-2001-1-inspection/conflicts","importantCases":"/api/acts/ad-bell-47-84-frame-stiffening-assembly-660-2001-1-inspection/important-cases","documents":"/api/acts/ad-bell-47-84-frame-stiffening-assembly-660-2001-1-inspection/documents"}}