{"id":"F2006B08668","name":"AD/CT58/10 - Accessory Drive Gearbox - Pinion Gear Bolt Torque","slug":"ad-ct58-10-accessory-drive-gearbox-pinion-gear-bolt-torque","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51760,"registerId":"commonwealth-F2006B08668-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CT58/10 - Accessory Drive Gearbox - Pinion Gear Bolt Torque","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/CT58/10 Accessory Drive Gearbox - Pinion Gear Bolt Torque 9/85\n\nApplicability: CT58-140-1 engines, S/N 295012 to 295185. All CT58-140-2 engines, S/N 296001 to 296026. All Accessory drive gearboxes P/N 5001T90G01 and G02 fitted to CT58- 100-2, 110-1, 110-2, 140-1 Series A and 140-1 Series L engines. All accessory drive gearboxes P/No 5001T90G01 and G02 stocked as spares.\n\n \n\nDocument: General Electric SB (CT58) A72-147; or\n\n \n\nAD/GE-T/30.\n\n \n\nCompliance: As detailed in the requirement document.\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":1979},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This remains a narrow, technical maintenance directive limited to its original 1985 purpose of addressing a specific mechanical defect in gearbox pinion bolts. It has not expanded beyond the specific engine models and part numbers originally identified."},"complexity_factors":["Extremely short directive with no definitions section","Technical requirements incorporated by reference to external manufacturer Service Bulletin rather than detailed in the text","Simple applicability criteria based only on specific serial and part number ranges","No conditional logic, exceptions, or cross-references to other legislative provisions"],"plain_english_summary":"This mandatory airworthiness directive for specific GE CT58 turbine engines requires maintenance personnel to inspect and retorque the pinion-gear bolts in the accessory drive gearbox per General Electric Service Bulletin A72-147 (or earlier AD/GE‑T/30). \n\nIt affects owners/operators of identified CT58-140-1 and CT58-140-2 engines (by serial number) and anyone holding accessory drive gearboxes P/N 5001T90G01/G02, including spares. The action prevents gearbox failure that could cause catastrophic engine damage or loss of aircraft control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ct58-10-accessory-drive-gearbox-pinion-gear-bolt-torque","history":"/api/acts/ad-ct58-10-accessory-drive-gearbox-pinion-gear-bolt-torque/history","analysis":"/api/acts/ad-ct58-10-accessory-drive-gearbox-pinion-gear-bolt-torque/analysis","conflicts":"/api/acts/ad-ct58-10-accessory-drive-gearbox-pinion-gear-bolt-torque/conflicts","importantCases":"/api/acts/ad-ct58-10-accessory-drive-gearbox-pinion-gear-bolt-torque/important-cases","documents":"/api/acts/ad-ct58-10-accessory-drive-gearbox-pinion-gear-bolt-torque/documents"}}