{"id":"F2006B07418","name":"AD/TPE 331/10 - High Speed Pinion Bearing Assembly - Replacement","slug":"ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49666,"registerId":"commonwealth-F2006B07418-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/10 - High Speed Pinion Bearing Assembly - Replacement","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 3/1986,Turbine engines,AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series,High Speed Pinion Bearing Assembly - Replacement,10\ntitle: Airworthiness Directive - AD/TPE 331/10 - High Speed Pinion Bearing Assembly - Replacement\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 331/10 High Speed Pinion Bearing Assembly - Replacement\n\n\n3/86\n\n \n\nApplicability: Models TPE-331-1-100F, 101B, 101E, 101F, 101J, 101L, 151A 151G, TPE-331-2- 201A and 201C. TPE-331-2UA-203D.\n\n \n\nDocument: 1. AiResearch TPE-331 SB 632, Rev. 3; or\n\n \n\n2. AiResearch TPE-331 SB 72-0064, or AD/AIR-T/11.\n\nCompliance: Before installation in an aircraft following next major reconditioning completed after 31 May 1977.\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\nFederal Register of Legislative Instruments F2006B07418\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1549},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original technical scope. It addresses a specific mechanical defect in specific engine models and has not expanded beyond its initial safety purpose."},"complexity_factors":["Very short document (under 200 words)","No defined terms section","Simple conditional compliance trigger (post-31 May 1977 reconditioning)","Limited applicability (11 specific engine models only)","Single operational requirement with clear timing"],"plain_english_summary":"This is a **safety rule** for specific aircraft engines made by AlliedSignal (formerly Garrett/AiResearch). It requires owners to replace the **high speed pinion bearing assembly** (a critical engine component) in certain TPE 331 series turbine engines.\n\n**Who it affects:**\n- Operators of aircraft with these specific engine models: TPE-331-1-100F, 101B, 101E, 101F, 101J, 101L, 151A, 151G, TPE-331-2-201A, 201C, and TPE-331-2UA-203D.\n\n**What you must do:**\n- Replace the high speed pinion bearing assembly before installing the engine in an aircraft, but only after the engine's next major reconditioning (a major overhaul) that happens after 31 May 1977.\n\n**Why it matters:**\n- This prevents engine failures caused by faulty bearings, keeping aircraft safe."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement","history":"/api/acts/ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement/history","analysis":"/api/acts/ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement/analysis","conflicts":"/api/acts/ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement/conflicts","importantCases":"/api/acts/ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement/important-cases","documents":"/api/acts/ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement/documents"}}