{"id":"F2006B04679","name":"AD/BELL 412/6 - Main Rotor Pitch Link Assemblies - Replacement","slug":"ad-bell-412-6-main-rotor-pitch-link-assemblies-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44431,"registerId":"commonwealth-F2006B04679-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 412/6 - Main Rotor Pitch Link Assemblies - 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 412/6 Main Rotor Pitch Link Assemblies - Replacement 3/83\n\nApplicability: All models.\n\n \n\nDocument: 1. Bell Alert SB 412-82-2, Revision “A” dated June 1982.\n\n \n\n2. Bell Alert SB 412-82-7 dated December 1982. Compliance: Within 100 hours time in service after 31st March 1983.\n\nBackground:  Manufacturer advises that some 412 helicopters were delivered with incorrectly assembled and rigged main rotor pitch link assemblies, requiring immediate inspection and replacement, with a modified pitch link tube and upper rod and bearing assembly.\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":2595},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains tightly focused on its original purpose: addressing the specific manufacturing defect in main rotor pitch link assemblies. There is no expansion beyond the immediate safety issue identified in the manufacturer's service bulletins."},"complexity_factors":["Single, unambiguous maintenance action required","Simple time-based compliance trigger (100 hours time in service)","References external technical documents rather than reproducing complex procedures within the instrument","No exemptions, exceptions, or conditional logic","Broad but clear applicability (all models)"],"plain_english_summary":"This mandatory safety order requires all owners/operators of Bell Helicopter Textron 412 series helicopters to inspect main rotor pitch link assemblies and replace any incorrectly assembled units with the modified parts specified by the manufacturer within 100 flight hours after 31 March 1983. It addresses factory-assembled defects that could cause pitch link failure and loss of helicopter control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-412-6-main-rotor-pitch-link-assemblies-replacement","history":"/api/acts/ad-bell-412-6-main-rotor-pitch-link-assemblies-replacement/history","analysis":"/api/acts/ad-bell-412-6-main-rotor-pitch-link-assemblies-replacement/analysis","conflicts":"/api/acts/ad-bell-412-6-main-rotor-pitch-link-assemblies-replacement/conflicts","importantCases":"/api/acts/ad-bell-412-6-main-rotor-pitch-link-assemblies-replacement/important-cases","documents":"/api/acts/ad-bell-412-6-main-rotor-pitch-link-assemblies-replacement/documents"}}