{"id":"F2006B07424","name":"AD/TPE 331/16 - Turbine Bearing Oil Inlet Tube - Replacement","slug":"ad-tpe-331-16-turbine-bearing-oil-inlet-tube-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49685,"registerId":"commonwealth-F2006B07424-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/16 - Turbine Bearing Oil Inlet Tube - Replacement","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nAlliedSignal (Garrett/AiResearch) Turbine Engines \\- TPE 331 Series\n\nAD/TPE 331/16 Turbine Bearing Oil Inlet Tube \\- Replacement 3/86\n\nApplicability: TPE-331-1-100F prior to Series No. 3.\n\nTPE-331-1-101B prior to Series No. 9. TPE-331-1-101E prior to Series No. 3. TPE-331-1-101F prior to Series No. 4. TPE-331-1-101J prior to Series No. 4. TPE-331-1-151A prior to Series No. 19. TPE-331-1-151G prior to Series No. 20. TPE-331-2-201A prior to Series No. 29. TPE-331-2-201C prior to Series No. 3. TPE-331-2UA-203D prior to Series No. 3\\. TPE-331-5-251C prior to Series No. 3.\n\nTPE-331-5-251K prior to Series No. 14. TPE-331-6-251M prior to Series No. 9. TPE-331-3U-303G prior to Series No. 11. TPE-331-3UW-303G prior to Series No. 10\\. TPE-331-3U-303N prior to Series No. 3.\n\nDocument: AiResearch SB TPE-331-79-0005, or AD/AIR-T/19\n\nCompliance: Before installation in an aircraft following reconditioning after 31 March 1974.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1641},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive maintains a narrow, targeted scope focused solely on replacement of a specific component (turbine bearing oil inlet tubes) on defined TPE 331 engine models. It does not expand beyond its original technical safety purpose."},"complexity_factors":["Technical aviation engineering terminology (turbine bearings, oil inlet tubes, reconditioning)","18 specific engine model variants each with unique serial number cutoffs","Conditional compliance trigger based on historical reconditioning date (post-31 March 1974)","Cross-reference to manufacturer service bulletins and superseded airworthiness directives"],"plain_english_summary":"This AD mandates replacement of the turbine bearing oil inlet tube on certain AlliedSignal (Garrett/AiResearch) TPE331 engines before installation if the engine was reconditioned after March 31, 1974 and falls below model-specific serial‑number cutoffs. It affects owners/operators of those TPE331 engines.\n\nThe rule prevents oil starvation of turbine bearings by requiring the service‑bulletin procedure (or complying with the alternative AD), reducing risk of catastrophic engine failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-16-turbine-bearing-oil-inlet-tube-replacement","history":"/api/acts/ad-tpe-331-16-turbine-bearing-oil-inlet-tube-replacement/history","analysis":"/api/acts/ad-tpe-331-16-turbine-bearing-oil-inlet-tube-replacement/analysis","conflicts":"/api/acts/ad-tpe-331-16-turbine-bearing-oil-inlet-tube-replacement/conflicts","importantCases":"/api/acts/ad-tpe-331-16-turbine-bearing-oil-inlet-tube-replacement/important-cases","documents":"/api/acts/ad-tpe-331-16-turbine-bearing-oil-inlet-tube-replacement/documents"}}