{"id":"F2009L03411","name":"AD/TPE 331/38 - Second Stage Turbine Wheel Assembly - CANCELLED","slug":"ad-tpe-331-38-second-stage-turbine-wheel-assembly-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":140989,"registerId":"commonwealth-F2009L03411-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AlliedSignal (Garrett/AiResearch) Turbin","sectionType":"division","heading":"AlliedSignal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 331/38 | Second Stage Turbine Wheel Assembly | 10/2009 |\n| ------------- | ----------------------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                        |\n| ------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 24 September 2009.                                                                                                                                                                                        |\n| Background:  | This unique Australian AD specified inspection and replacement of second stage turbine wheel assemblies in accordance with Garrett SB No. A72-0577 within 50 hours time in service after June 1988. 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 331/38","sectionType":"part","heading":"AD/TPE 331/38","content":"## AD/TPE 331/38","sortOrder":1},{"sectionNumber":"Second Stage Turbine Wheel Assembly","sectionType":"part","heading":"Second Stage Turbine Wheel Assembly","content":"## Second Stage Turbine Wheel Assembly","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":2603},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument eliminates the previous requirements entirely rather than expanding the scope of the legislation. The regulatory obligation has been cancelled rather than grown beyond its original purpose."},"complexity_factors":["Single operative provision (cancellation)","No defined terms section","No cross-references to other legislation","No conditional logic or nested exceptions"],"plain_english_summary":"This document cancels a previous aviation safety rule affecting specific aircraft engines.\n\n**What it does:**\nCancels Airworthiness Directive (AD) TPE 331/38, which previously required owners and operators of AlliedSignal (Garrett/AiResearch) TPE 331 series turbine engines to inspect and replace second stage turbine wheel assemblies. The old rule required this maintenance to be done within 50 hours of flight time after June 1988, following the manufacturer's Service Bulletin No. A72-0577.\n\n**Who it affects:**\nAircraft operators, owners, and maintenance organisations responsible for aircraft powered by TPE 331 series engines (commonly used in regional airliners and agricultural aircraft).\n\n**Why it matters:**\nAs of 24 September 2009, the mandatory inspection and replacement requirement no longer applies. This removes a regulatory maintenance burden that had become obsolete, potentially saving operators time and money while safety is maintained through other means."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-38-second-stage-turbine-wheel-assembly-cancelled","history":"/api/acts/ad-tpe-331-38-second-stage-turbine-wheel-assembly-cancelled/history","analysis":"/api/acts/ad-tpe-331-38-second-stage-turbine-wheel-assembly-cancelled/analysis","conflicts":"/api/acts/ad-tpe-331-38-second-stage-turbine-wheel-assembly-cancelled/conflicts","importantCases":"/api/acts/ad-tpe-331-38-second-stage-turbine-wheel-assembly-cancelled/important-cases","documents":"/api/acts/ad-tpe-331-38-second-stage-turbine-wheel-assembly-cancelled/documents"}}