{"id":"F2009L03425","name":"AD/TPE 331/10 - High Speed Pinion Bearing Assembly - Replacement - CANCELLED","slug":"ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":141015,"registerId":"commonwealth-F2009L03425-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AlliedSignal (Garrett/AiResearch) Turbin","sectionType":"division","heading":"AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series","content":"### AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series\n\n| AD/TPE 331/10 | High Speed Pinion BearingAssembly - Replacement | 10/2009 |\n| ------------- | ----------------------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                              |\n| ------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 24 September 2009.                                                                                                                                                                              |\n| Background:  | This unique Australian AD specified action in accordance with Airesearch SBNo. 632 or 72-0064 before installation in an aircraft following the next major re‑conditioning after May 1977. The AD is no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n14 August 2009","sortOrder":0},{"sectionNumber":"AD/TPE 331/10","sectionType":"part","heading":"AD/TPE 331/10","content":"## AD/TPE 331/10","sortOrder":1},{"sectionNumber":"High Speed Pinion BearingAssembly - Repl","sectionType":"part","heading":"High Speed Pinion BearingAssembly - Replacement","content":"## High Speed Pinion Bearing  \nAssembly - Replacement","sortOrder":2},{"sectionNumber":"10/2009","sectionType":"part","heading":"10/2009","content":"## 10/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1955},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":true,"description":"The legislation has been completely cancelled, shifting from mandating specific high-speed pinion bearing replacements during engine overhauls to imposing no obligations whatsoever. The scope has effectively been reduced to nil."},"complexity_factors":["Single operative provision consisting of one word: 'CANCELLED'","No defined terms or interpretation section","No conditional logic, exceptions, or cross-references to legislation","Total operative text is approximately 15 words","Document consists almost entirely of historical background explanation"],"plain_english_summary":"This document **cancels** a previous aviation safety rule that required specific maintenance on certain aircraft engines.\n\n**What it did:** The original rule (issued in 1977) required owners and mechanics to replace high-speed pinion bearings in AlliedSignal (Garrett/AiResearch) TPE 331 turbine engines during major overhauls.\n\n**What this does:** It withdraws that requirement entirely. The bearing replacement is no longer mandatory under this directive.\n\n**Who it affects:** Aircraft operators and maintenance organisations using TPE 331 series turbine engines.\n\n**Why it matters:** This removes a compulsory maintenance step, potentially saving time and money for aircraft owners, assuming alternative safety standards now apply."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement-cancelled","history":"/api/acts/ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement-cancelled/history","analysis":"/api/acts/ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement-cancelled/analysis","conflicts":"/api/acts/ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement-cancelled/conflicts","importantCases":"/api/acts/ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement-cancelled/important-cases","documents":"/api/acts/ad-tpe-331-10-high-speed-pinion-bearing-assembly-replacement-cancelled/documents"}}