{"id":"F2006B04705","name":"AD/BELL 47/82 Amdt 1 - Tail Rotor Drive and Fan Drive Bearings","slug":"ad-bell-47-82-amdt-1-tail-rotor-drive-and-fan-drive-bearings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44469,"registerId":"commonwealth-F2006B04705-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 47/82 Amdt 1 - Tail Rotor Drive and Fan Drive Bearings","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 47/82\n\nAmdt 1\n\n\nTail Rotor Drive and Fan Drive Bearings 10/86\n\n \n\nApplicability: All model 47G-2, 47G-2A, 47G-3, 47G-3B, 47G-3B-1, 47G-4, 47G-4A, 47G-5, 47G-\n\n5A, 47J, 47J-2, 47J-2A not modified in accordance with Bell ASB 47-80-6 or Kawasaki-Bell SB KSB-Bell 353.\n\nDocument:  Bell Alert Service Bulletin 47-80-6. Kawasaki-Bell S.B. KSB-Bell 353. Compliance:              Before installation on an aircraft following the next 600 hourly inspection after 30\n\nOctober 1980.\n\n \n\nBackground: To reduce the possibility of failure of the tail rotor drive or fan drive within the main gear box, the manufacturer has introduced an improved bearing. This Directive has been amended to include Kawasaki-Bell Helicopters.\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":1951},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"Expanded from Bell Helicopter Textron models only to additionally include Kawasaki-Bell manufactured helicopters, broadening geographic and manufacturer coverage"},"complexity_factors":["Technical aviation terminology requiring specialized knowledge (airworthiness directives, service bulletins, gearbox assemblies)","Enumeration of 14 specific helicopter model variants in the applicability clause","Cross-references to two separate manufacturer service bulletins (Bell ASB 47-80-6 and Kawasaki-Bell SB)","Conditional compliance deadline tied to maintenance inspection cycles (600-hourly inspections post-1980)"],"plain_english_summary":"**What this is:** An Airworthiness Directive (a mandatory safety order) issued by the Civil Aviation Safety Authority requiring replacement of faulty bearings in certain helicopters.\n\n**Who it affects:** Owners and operators of specific Bell 47 helicopter models—including variants 47G-2, 47G-3, 47G-4, 47G-5, and 47J series—that have **not** already been modified according to Bell Alert Service Bulletin 47-80-6 or Kawasaki-Bell Service Bulletin KSB-Bell 353.\n\n**What you must do:** Install improved bearings in the tail rotor drive and fan drive systems (located within the main gearbox) before the next 600-hourly inspection occurring after 30 October 1980.\n\n**Why it matters:** The original bearings were prone to failure, which could cause loss of tail rotor control or cooling fan function, potentially leading to catastrophic accidents. This amendment expands the safety requirement to cover helicopters manufactured by Kawasaki-Bell in addition to those made by Bell Helicopter Textron."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-47-82-amdt-1-tail-rotor-drive-and-fan-drive-bearings","history":"/api/acts/ad-bell-47-82-amdt-1-tail-rotor-drive-and-fan-drive-bearings/history","analysis":"/api/acts/ad-bell-47-82-amdt-1-tail-rotor-drive-and-fan-drive-bearings/analysis","conflicts":"/api/acts/ad-bell-47-82-amdt-1-tail-rotor-drive-and-fan-drive-bearings/conflicts","importantCases":"/api/acts/ad-bell-47-82-amdt-1-tail-rotor-drive-and-fan-drive-bearings/important-cases","documents":"/api/acts/ad-bell-47-82-amdt-1-tail-rotor-drive-and-fan-drive-bearings/documents"}}