{"id":"F2006B04678","name":"AD/BELL 412/5 Amdt 1 - Engine Fuel Switch - Inspection/Replacement","slug":"ad-bell-412-5-amdt-1-engine-fuel-switch-inspection-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44430,"registerId":"commonwealth-F2006B04678-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 412/5 Amdt 1 - Engine Fuel Switch - Inspection/Replacement","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 412 Series Helicopters\n\n \n\nAD/BELL 412/5\n\nAmdt 1\n\n\nEngine Fuel Switch - Inspection/Replacement 4/83\n\n \n\nApplicability: Model 412 S/Nos. 33001 thru 33100.\n\n \n\nDocument: Bell Tech Bulletin No. 412-82-10 Rev. “A” dated 14th Dec. 1982.\n\nCompliance: Within 25 hours time in service after 30 April 1983 unless previously accomplished. Background:              Reports received indicate malfunctioning of certain date coded engine fuel switches,\n\nresulting in the shutting off of the applicable engine fuel supply. This Directive is raised in issue following receipt of Revision “A” of the requirement document. The Directive is now applicable to additional serial numbered aircraft.\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":2680},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This amendment expands the directive's applicability to include additional serial numbered aircraft (specifically Model 412 serial numbers 33001 through 33100), extending the safety mandate beyond the scope of the original directive as explicitly noted in the background text."},"complexity_factors":["Cross-reference to external technical specification document for detailed procedures","Amendment structure modifies prior directive scope","Precise serial number applicability range (33001-33100)","Time-based compliance metric using 'hours in service'"],"plain_english_summary":"This AD requires owners/operators of Bell Model 412 helicopters, serials 33001–33100, to inspect or replace engine fuel switches within 25 flight hours after 30 April 1983 (unless already done). It responds to reports of switches shutting off fuel in flight, risking engine failure and loss of control, and follows procedures in Bell Technical Bulletin No. 412-82-10 Rev A. This Amendment 1 expands the affected serial-number range."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-412-5-amdt-1-engine-fuel-switch-inspection-replacement","history":"/api/acts/ad-bell-412-5-amdt-1-engine-fuel-switch-inspection-replacement/history","analysis":"/api/acts/ad-bell-412-5-amdt-1-engine-fuel-switch-inspection-replacement/analysis","conflicts":"/api/acts/ad-bell-412-5-amdt-1-engine-fuel-switch-inspection-replacement/conflicts","importantCases":"/api/acts/ad-bell-412-5-amdt-1-engine-fuel-switch-inspection-replacement/important-cases","documents":"/api/acts/ad-bell-412-5-amdt-1-engine-fuel-switch-inspection-replacement/documents"}}