{"id":"F2006B07425","name":"AD/TPE 331/17 - Turbine Bearing Oil Inlet Tube - Replacement","slug":"ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49689,"registerId":"commonwealth-F2006B07425-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/17 - Turbine Bearing Oil Inlet Tube - 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 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series\n\n \n\nAD/TPE 331/17 Turbine Bearing Oil Inlet Tube - Replacement 3/86\n\nApplicability: Models : TPE-331-35AA, -AB, -DA, -DB, -FA. TPE-331-43A, -BL. TPE-331-47A. TPE-331-55A, -55B, TPE-331-61A. Refer to SB TPE-331-79-0007 for detailed\n\napplicability on the basis of part number and modification series.\n\n \n\nDocument: AiResearch SB TPE-331-79-0007; or\n\n \n\nAD/AIR-T/22.\n\n \n\nCompliance: Before installation in an aircraft following reconditioning after 30 September 1974.\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":2007},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This directive maintains a narrow, technical scope focused solely on the replacement of oil inlet tubes for specific engine models. It represents a targeted safety intervention without expansion into broader operational or administrative requirements."},"complexity_factors":["Dense alphanumeric model number strings requiring cross-reference to service bulletin for exact part identification","Conditional compliance triggered by historical date threshold (30 September 1974) combined with maintenance status (reconditioning)","External incorporation of technical service bulletin SB TPE-331-79-0007 by reference without reproducing requirements in the directive itself","Aviation-specific terminology ('reconditioning', 'airworthiness', 'modification series') assumed knowledge"],"plain_english_summary":"This Airworthiness Directive requires owners/operators and maintenance engineers installing certain AlliedSignal (Garrett/AiResearch) TPE‑331 engines reconditioned after 30 September 1974 to replace the turbine bearing oil inlet tube before installation.  \n\nCompliance follows AlliedSignal Service Bulletin TPE‑331‑79‑0007 (or equivalent AD/AIR‑T/22). The action prevents oil-pressure loss and potential engine failure or in‑flight shutdown."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement","history":"/api/acts/ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement/history","analysis":"/api/acts/ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement/analysis","conflicts":"/api/acts/ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement/conflicts","importantCases":"/api/acts/ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement/important-cases","documents":"/api/acts/ad-tpe-331-17-turbine-bearing-oil-inlet-tube-replacement/documents"}}