{"id":"F2006B04652","name":"AD/BELL 412/18 - Engine Fuel Valve Electrical Connectors P/No MS3456W14S-5S","slug":"ad-bell-412-18-engine-fuel-valve-electrical-connectors-p-no-ms3456w14s-5s","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44404,"registerId":"commonwealth-F2006B04652-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 412/18 - Engine Fuel Valve Electrical Connectors P/No MS3456W14S-5S","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\n# AD/BELL 412/18 Engine Fuel Valve Electrical Connectors\n\nP/No MS3456W14S-5S\n\nApplicability: Model 412 and 412NB S No 33001 to 33138 and S No 33150. Requirement:  Action in accordance with Bell Alert SB 412-87-31.\n\nCompliance: Prior to 1 March 1988.\n\n# 1/88\n\n \n\nBackground:  Field reports against some motor driven fuel valves indicate that with no prior warning the valve begins to oscillate between “open and closed”. The failure has been traced to an internal short circuit within the fuel valve connector P No MS3456W14S-5S manufactured by T.J. Electronics, and identified by the prefix TJE.\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":1504},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope: addressing a specific defective part in specific aircraft models. There is no evidence of scope creep; it remains a targeted safety fix for the fuel valve connector issue as originally identified."},"complexity_factors":["Single, unambiguous requirement referencing one external service bulletin","Specific part number and manufacturer identified (T.J. Electronics prefix TJE)","Limited applicability with explicit serial number ranges","No conditional logic, exceptions, or defined terms section","Straightforward compliance deadline with no extensions or alternatives stated"],"plain_english_summary":"This Airworthiness Directive (AD) is a safety order requiring owners of specific Bell 412 helicopters to fix a dangerous electrical fault that could cause engine failure.\n\n**The problem:**\nElectrical connectors on the engine fuel valves (part number MS3456W14S-5S made by T.J. Electronics) can develop internal short circuits. This causes the fuel valve to rapidly oscillate between \"open\" and \"closed\" without warning, potentially starving the engine of fuel or causing erratic fuel flow.\n\n**Which aircraft are affected:**\n- Bell 412 and 412NB helicopters\n- Serial numbers 33001 to 33138, and 33150\n\n**What must be done:**\nOperators must follow the instructions in Bell Alert Service Bulletin 412-87-31 to inspect and replace the faulty electrical connectors.\n\n**Deadline:**\nThe work had to be completed before 1 March 1988."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-412-18-engine-fuel-valve-electrical-connectors-p-no-ms3456w14s-5s","history":"/api/acts/ad-bell-412-18-engine-fuel-valve-electrical-connectors-p-no-ms3456w14s-5s/history","analysis":"/api/acts/ad-bell-412-18-engine-fuel-valve-electrical-connectors-p-no-ms3456w14s-5s/analysis","conflicts":"/api/acts/ad-bell-412-18-engine-fuel-valve-electrical-connectors-p-no-ms3456w14s-5s/conflicts","importantCases":"/api/acts/ad-bell-412-18-engine-fuel-valve-electrical-connectors-p-no-ms3456w14s-5s/important-cases","documents":"/api/acts/ad-bell-412-18-engine-fuel-valve-electrical-connectors-p-no-ms3456w14s-5s/documents"}}