{"id":"F2006B04554","name":"AD/BELL 212/22 - Tail Rotor Drive Shaft - Replacement","slug":"ad-bell-212-22-tail-rotor-drive-shaft-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114284,"registerId":"commonwealth-F2006B04554-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 212/22 - Tail Rotor Drive Shaft - 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\nBell Helicopter Textron 212 Series Helicopters\n\n \n\nAD/BELL 212/22 Tail Rotor Drive Shaft - Replacement 9/78\n\nApplicability: Model 212 helicopters with S/Nos. 30501 to 30863, and 30865. Document:  Bell SB 212-78-7.\n\nCompliance: Within 200 hours time in service after 30 September 1978.\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1186},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, technical maintenance directive that remains tightly scoped to a specific mechanical component on specific aircraft serial numbers. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single unambiguous operational requirement","No defined terms or interpretation sections","No exceptions, exemptions, or conditional logic","Extremely short length (one substantive paragraph)"],"plain_english_summary":"**What this is:** A mandatory aviation safety directive (called an Airworthiness Directive) issued by the Civil Aviation Safety Authority (CASA).\n\n**Who it affects:** Owners and operators of specific Bell 212 helicopters with serial numbers between 30501 and 30863, plus serial number 30865.\n\n**What it requires:** You must replace the tail rotor drive shaft (a critical component that transfers power to the tail rotor) on these helicopters.\n\n**When:** Within 200 hours of flight time after 30 September 1978.\n\n**Why it matters:** This prevents potentially catastrophic mechanical failure. The directive references a manufacturer service bulletin (SB 212-78-7) that identifies a safety defect in the original drive shaft. Non-compliance means the aircraft cannot legally fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-212-22-tail-rotor-drive-shaft-replacement","history":"/api/acts/ad-bell-212-22-tail-rotor-drive-shaft-replacement/history","analysis":"/api/acts/ad-bell-212-22-tail-rotor-drive-shaft-replacement/analysis","conflicts":"/api/acts/ad-bell-212-22-tail-rotor-drive-shaft-replacement/conflicts","importantCases":"/api/acts/ad-bell-212-22-tail-rotor-drive-shaft-replacement/important-cases","documents":"/api/acts/ad-bell-212-22-tail-rotor-drive-shaft-replacement/documents"}}