{"id":"F2006B08682","name":"AD/CT58/7 - Power Turbine Wheel","slug":"ad-ct58-7-power-turbine-wheel","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51817,"registerId":"commonwealth-F2006B08682-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CT58/7 - Power Turbine Wheel","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 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  General Electric Turbine Engines - CT58 Series\n\n \n\nAD/CT58/7 Power Turbine Wheel 9/85\n\nApplicability: All CT5B-100-1,-100-2,-110-2,-140-1 and -140-2 engines. Document:  General Electric SB (CT58) 72-127 (CEB No. 208); or\n\nAD/GE-T/16.\n\n \n\nCompliance: Before installation in an aircraft following the next light-overhaul or complete overhaul, completed after 23 March 1970 whichever occurs first.\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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2505},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow technical scope. It addresses a specific safety issue with the power turbine wheel in specific CT58 engine models and has not expanded to cover additional components, engine types, or operational requirements beyond the original intent."},"complexity_factors":["Extremely short length (single requirement)","No defined terms section or legal definitions","Only two external reference documents (Service Bulletin 72-127 or AD/GE-T/16)","Simple compliance trigger based on maintenance event date","Narrow applicability limited to 5 specific engine model variants"],"plain_english_summary":"This is a mandatory **Airworthiness Directive** (a legal safety notice) issued by the Civil Aviation Safety Authority for specific aircraft engines.\n\n**What it requires:**\nBefore installing any affected engine in an aircraft after maintenance, you must ensure the **Power Turbine Wheel** (a critical spinning component that drives the aircraft) meets specific safety standards outlined in General Electric Service Bulletin 72-127. Alternatively, you can comply using another directive called AD/GE-T/16.\n\n**Which engines are affected:**\nAll General Electric CT58 series engines with these model numbers:\n- CT5B-100-1 and CT5B-100-2\n- CT5B-110-2\n- CT5B-140-1 and CT5B-140-2\n\n**When it applies:**\nThe requirement kicks in before installation following the engine's next \"light-overhaul\" or \"complete overhaul\" (major maintenance checks) completed after 23 March 1970.\n\n**Why it matters:**\nThis prevents potentially dangerous power turbine wheel failures that could cause engine breakdown during flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ct58-7-power-turbine-wheel","history":"/api/acts/ad-ct58-7-power-turbine-wheel/history","analysis":"/api/acts/ad-ct58-7-power-turbine-wheel/analysis","conflicts":"/api/acts/ad-ct58-7-power-turbine-wheel/conflicts","importantCases":"/api/acts/ad-ct58-7-power-turbine-wheel/important-cases","documents":"/api/acts/ad-ct58-7-power-turbine-wheel/documents"}}