{"id":"F2006B04646","name":"AD/BELL 412/11 - Main Rotor Yoke, P/N 412-010-101-123 - Inspection","slug":"ad-bell-412-11-main-rotor-yoke-p-n-412-010-101-123-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44398,"registerId":"commonwealth-F2006B04646-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 412/11 - Main Rotor Yoke, P/N 412-010-101-123 - 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 412 Series Helicopters\n\n \n\n# AD/BELL 412/11 Main Rotor Yoke, P/N 412-010-101-123 -\n\nInspection\n\nApplicability: As specified in Requirement Documents.\n\n \n\nRequirement: Bell Helicopter Textron Alert Service Bulletin 412-85-19.\n\n \n\nCompliance: Within 100 hours time in service after 31 May 1985 or at the next scheduled\n\n# 5/85\n\ninspection for Maintenance Release issue after 31 May 1985, whichever is the later.\n\n \n\nBackground:  Scratches were discovered in the centre section of Model 412 Yokes P/N 412-010- 101-123. These occurred at manufacture during preparation of the centre section of the yoke prior to the shot peening process.\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":1478},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original, narrow scope. It addresses a specific manufacturing defect identified in Bell 412 main rotor yokes and has not expanded to cover additional parts, aircraft models, or unrelated safety issues."},"complexity_factors":["Single, unambiguous requirement referencing one external technical document (Alert Service Bulletin 412-85-19)","Narrow applicability limited to one specific part number on one helicopter model series","Simple binary compliance deadline with clear 'whichever is later' condition","No defined terms, exceptions, or nested conditional logic"],"plain_english_summary":"This Airworthiness Directive orders urgent inspections of Bell 412 helicopters fitted with main rotor yoke P/N 412-010-101-123 after discovery of pre–shot-peening scratches that may weaken the part. Operators must follow Bell Alert Service Bulletin 412-85-19 and inspect within 100 flight hours after 31 May 1985 or at the next scheduled Maintenance Release inspection, whichever is later. A yoke failure could detach the rotor and cause loss of aircraft and life."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-412-11-main-rotor-yoke-p-n-412-010-101-123-inspection","history":"/api/acts/ad-bell-412-11-main-rotor-yoke-p-n-412-010-101-123-inspection/history","analysis":"/api/acts/ad-bell-412-11-main-rotor-yoke-p-n-412-010-101-123-inspection/analysis","conflicts":"/api/acts/ad-bell-412-11-main-rotor-yoke-p-n-412-010-101-123-inspection/conflicts","importantCases":"/api/acts/ad-bell-412-11-main-rotor-yoke-p-n-412-010-101-123-inspection/important-cases","documents":"/api/acts/ad-bell-412-11-main-rotor-yoke-p-n-412-010-101-123-inspection/documents"}}