{"id":"F2006B04501","name":"AD/BELL 206/45 - Tail Rotor Drive Shaft Cover and Lower Skin of Horizontal Stabilizer - Modification","slug":"ad-bell-206-45-tail-rotor-drive-shaft-cover-and-lower-skin-of-horizontal-stabilizer-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114197,"registerId":"commonwealth-F2006B04501-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/45 - Tail Rotor Drive Shaft Cover and Lower Skin of Horizontal Stabilizer - Modification","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 Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\n \n\nAD/BELL 206/45 Tail Rotor Drive Shaft Cover and Lower Skin\n\nof Horizontal Stabilizer - Modification Applicability: All model 206B with S/Nos. 914 and subsequent with metal buttons installed. Document:               Bell SB 206-01-73-3.\n\nCompliance: Within 5 days after 1 May 1973.\n\n\n5/73\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2392},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope - mandating a specific structural modification on a defined subset of Bell 206B helicopters to address a safety issue. There is no indication the scope has expanded beyond the original intent."},"complexity_factors":["Extremely short text (single operative paragraph)","No defined terms section","Single, clear applicability criterion (model 206B, serial numbers 914+, with metal buttons)","One external reference to manufacturer service bulletin","No conditional logic, exceptions, or nested provisions","Fixed compliance deadline with no alternative methods stated"],"plain_english_summary":"This Airworthiness Directive mandates structural modifications to the tail of Bell 206B helicopters (serial numbers 914 and higher) that have specific \"metal buttons\" installed. Owners/operators must perform the work per Bell Service Bulletin 206-01-73-3 on the tail rotor drive shaft cover and the lower skin of the horizontal stabilizer.\n\nCompliance was required within five days after 1 May 1973. The change corrects a safety defect affecting structural integrity; operating without it violates civil aviation safety rules."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-45-tail-rotor-drive-shaft-cover-and-lower-skin-of-horizontal-stabilizer-modification","history":"/api/acts/ad-bell-206-45-tail-rotor-drive-shaft-cover-and-lower-skin-of-horizontal-stabilizer-modification/history","analysis":"/api/acts/ad-bell-206-45-tail-rotor-drive-shaft-cover-and-lower-skin-of-horizontal-stabilizer-modification/analysis","conflicts":"/api/acts/ad-bell-206-45-tail-rotor-drive-shaft-cover-and-lower-skin-of-horizontal-stabilizer-modification/conflicts","importantCases":"/api/acts/ad-bell-206-45-tail-rotor-drive-shaft-cover-and-lower-skin-of-horizontal-stabilizer-modification/important-cases","documents":"/api/acts/ad-bell-206-45-tail-rotor-drive-shaft-cover-and-lower-skin-of-horizontal-stabilizer-modification/documents"}}