{"id":"F2006B04686","name":"AD/BELL 47/31 - Lateral Cyclic Torque Tube Safety Washers","slug":"ad-bell-47-31-lateral-cyclic-torque-tube-safety-washers","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44438,"registerId":"commonwealth-F2006B04686-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 47/31 - Lateral Cyclic Torque Tube Safety Washers","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\nAD/BELL 47/31 Lateral Cyclic Torque Tube Safety Washers 11/61\n\nApplicability: All models.\n\n \n\nRequirement: 1. Fit a steel safety washer to each end of the lateral cyclic torque tube on the outer side of the ball bearing.\n\n \n\n2.    The outside diameter of these washers should be approximately 1 1/2 inches and they should be so shaped as to obviate the possibility of interference with the bearings in all positions of the control. A suitable design of washer is illustrated in Figure 1.\n\n \n\n \n\n![](image.002.png)  \n\n\n \n\nFigure 1.\n\n \n\n3.    Remove the nuts from each end of the torque tube, fit safety washers, replace nuts, torque to 100-110 inch pounds and install split pins.\n\n \n\nCompliance: Forthwith.\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":2408},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope as a specific hardware modification for the lateral cyclic control system of Bell 47 helicopters. It has not expanded into operational limitations, pilot training requirements, or other aircraft systems."},"complexity_factors":["Single, unambiguous mechanical instruction with no conditional provisions or exceptions","No defined terms or interpretive sections requiring legal analysis","Precise, measurable requirements (1.5 inch diameter, 100-110 inch-pounds torque) leaving no discretion","No cross-references to other legislation, regulations, or technical standards","Immediate compliance deadline with no alternative compliance methods or phased implementation"],"plain_english_summary":"This Airworthiness Directive mandates immediate mechanical action for all Bell 47 helicopters to prevent loss of lateral control. Operators must fit steel safety washers and properly secure the lateral cyclic torque tube ends (including re-torquing nuts and locking with split pins) to stop the ball bearings from shifting or slipping off.\n\nThe fix is required forthwith because it eliminates a potential in-flight control failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-47-31-lateral-cyclic-torque-tube-safety-washers","history":"/api/acts/ad-bell-47-31-lateral-cyclic-torque-tube-safety-washers/history","analysis":"/api/acts/ad-bell-47-31-lateral-cyclic-torque-tube-safety-washers/analysis","conflicts":"/api/acts/ad-bell-47-31-lateral-cyclic-torque-tube-safety-washers/conflicts","importantCases":"/api/acts/ad-bell-47-31-lateral-cyclic-torque-tube-safety-washers/important-cases","documents":"/api/acts/ad-bell-47-31-lateral-cyclic-torque-tube-safety-washers/documents"}}