{"id":"F2006B04574","name":"AD/BELL 212/42 - Main Rotor Tension Torsion Straps","slug":"ad-bell-212-42-main-rotor-tension-torsion-straps","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114304,"registerId":"commonwealth-F2006B04574-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 212/42 - Main Rotor Tension Torsion Straps","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 212 Series Helicopters\n\n \n\nAD/BELL 212/42 Main Rotor Tension Torsion Straps 12/89\n\nApplicability: All models.\n\n \n\nRequirement: Action in accordance with Bell Alert Service Bulletin 212-89-55.\n\n \n\nCompliance: By 13 October 1989, unless already accomplished. Thereafter, reinspect each time replacement tension torsion straps are fitted.\n\n \n\nBackground: The manufacturer has advised that certain S/N tension torsion straps, P/N 204-012- 122-5 and 204-310-101-101, are being manufactured and sold without the normal Bell certification procedures being applied. These straps must not be used in service.\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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2109},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is the original 1989 directive addressing a specific safety issue regarding uncertified helicopter rotor components. The scope remains precisely targeted at the identified manufacturing defect in Bell 212 tension torsion straps and has not expanded beyond this original safety concern."},"complexity_factors":["Single, specific technical mandate with one clear deadline","External reference to manufacturer service bulletin (Bell Alert Service Bulletin 212-89-55) without reproducing its contents","Minimal conditional logic (ongoing reinspection only triggered when parts are replaced)","Reliance on technical aviation terminology (part numbers, serial numbers, service bulletins) that assumes specialized domain knowledge"],"plain_english_summary":"This Airworthiness Directive prohibits the use of uncertified tension-torsion straps installed on Bell 212 main rotors and requires compliance with Bell’s Alert Service Bulletin 212-89-55 to inspect and replace them by the stated deadline.  \n\nIt applies to all Bell 212 owners, operators and maintenance personnel — because these uncertified straps compromise main-rotor integrity and risk catastrophic failure, immediate inspection and replacement is mandatory."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-212-42-main-rotor-tension-torsion-straps","history":"/api/acts/ad-bell-212-42-main-rotor-tension-torsion-straps/history","analysis":"/api/acts/ad-bell-212-42-main-rotor-tension-torsion-straps/analysis","conflicts":"/api/acts/ad-bell-212-42-main-rotor-tension-torsion-straps/conflicts","importantCases":"/api/acts/ad-bell-212-42-main-rotor-tension-torsion-straps/important-cases","documents":"/api/acts/ad-bell-212-42-main-rotor-tension-torsion-straps/documents"}}