{"id":"F2006B07457","name":"AD/TPE 331/46 - Life Limited Components, -12 Series Engines","slug":"ad-tpe-331-46-life-limited-components-12-series-engines","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49807,"registerId":"commonwealth-F2006B07457-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/46 - Life Limited Components, -12 Series Engines","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 331/46 Life Limited Components, -12 Series Engines 3/95\n\nCANCELLED.\n\n \n\nBackground: This Directive is cancelled. The requirement for the control of turbine engine life limited components is now covered by AD/ENG/7.\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\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The cancellation does not on its face remove the regulatory control over life‑limited components; it relocates that control to AD/ENG/7 (\"The requirement for the control of turbine engine life limited components is now covered by AD/ENG/7\"). Therefore the substantive subject matter (control of life‑limited turbine engine components for the TPE331 series) appears to remain within the AD regime, but under a different AD number. The instrument itself provides no evidence of a change in substantive scope."},"complexity_factors":["Document is a single administrative cancellation with a single cross‑reference, so the text itself is short and unambiguous.","Operative detail is absent from this entry; complexity for readers arises only if AD/ENG/7 must be located and compared for substantive requirements.","Potential compliance complexity is external to this document (depends on AD/ENG/7 content), increasing practical complexity despite the simple text.","No transitional or implementation instructions are included, requiring operators to exercise judgment in locating and applying the replacement AD."],"plain_english_summary":"This instrument cancels Airworthiness Directive AD/TPE 331/46 and directs operators, owners and maintainers of AlliedSignal TPE331 series engines to follow AD/ENG/7 for control of life‑limited turbine engine components.  \n\nThe change is administrative—removing the old AD from the Schedule—but matters because compliance responsibilities now transfer to AD/ENG/7, so affected parties must consult that directive for operative requirements."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a cancellation instrument that explicitly transfers its regulatory function to AD/ENG/7. The scope has not expanded; rather, it has been deliberately consolidated into a broader instrument."},"complexity_factors":["Document is a cancellation notice, not an operative provision","No substantive regulatory requirements remain in force","Single cross-reference to replacement directive (AD/ENG/7)","No defined terms, conditions, or procedural steps","Extremely short (under 100 words of operative content)"],"plain_english_summary":"**What this is:** This is a cancelled Airworthiness Directive (AD) for a specific type of aircraft engine.\n\n**What it did:** Originally, this directive required owners and operators of AlliedSignal TPE 331-12 series turbine engines to track and manage \"life limited components\" — parts of the engine that must be replaced after a certain number of flight hours or cycles, regardless of condition. These parts are critical safety items that wear out predictably.\n\n**What happened:** The directive has been **cancelled**. Its requirements are now covered by a broader, more general directive called **AD/ENG/7**, which handles life limited components for engines across the board rather than addressing this specific engine model separately.\n\n**Who it affected:** Aircraft operators, maintenance organisations, and owners using TPE 331-12 series engines (commonly found in regional airliners, agricultural aircraft, and military trainers).\n\n**Why it matters:** This shows how aviation safety regulation evolves — specific rules get consolidated into broader frameworks to reduce duplication and make compliance simpler. If you're maintaining one of these engines, you don't follow this cancelled directive anymore; you follow AD/ENG/7 instead."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-46-life-limited-components-12-series-engines","history":"/api/acts/ad-tpe-331-46-life-limited-components-12-series-engines/history","analysis":"/api/acts/ad-tpe-331-46-life-limited-components-12-series-engines/analysis","conflicts":"/api/acts/ad-tpe-331-46-life-limited-components-12-series-engines/conflicts","importantCases":"/api/acts/ad-tpe-331-46-life-limited-components-12-series-engines/important-cases","documents":"/api/acts/ad-tpe-331-46-life-limited-components-12-series-engines/documents"}}