{"id":"F2006B07417","name":"AD/TPE 331/1 Amdt 5 - Life Limited Components","slug":"ad-tpe-331-1-amdt-5-life-limited-components","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49663,"registerId":"commonwealth-F2006B07417-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/1 Amdt 5 - Life Limited Components","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 331/1\n\nAmdt 5\n\n\nLife Limited Components 3/95\n\n \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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The original scope (control of life-limited components as set out in AD/TPE 331/1 Amdt 5) is no longer enforced under that engine-specific AD because that directive has been cancelled. The requirement itself has been moved to a different airworthiness directive (AD/ENG/7), so the regulatory placement of the requirement has changed (see the cancellation line and Background paragraph). The substantive subject (control of turbine engine life-limited components) continues to be regulated, but under a different instrument."},"complexity_factors":["Short, single-purpose document: it only records a cancellation and a cross-reference (the cancellation line and Background paragraph).","Cross-reference dependency: the operative requirements are relocated to AD/ENG/7, requiring readers to consult another directive for details.","Lack of technical detail: no inspection intervals, part numbers, procedures, or transitional arrangements are provided here.","Regulatory context implicit: the Schedule and issuing authority (Civil Aviation Safety Authority) are named but procedural and enforcement mechanisms are not described in this entry.","Potential for operational ambiguity: affected parties must determine the current obligations by reading AD/ENG/7, which adds a step to compliance.","Limited audience: the instrument applies to a specific engine series (TPE 331), narrowing but concentrating the affected population."],"plain_english_summary":"This record notes cancellation of AD/TPE 331/1 Amdt 5 for AlliedSignal (Garrett/AiResearch) TPE331 engines. The engine‑specific directive no longer applies.\n\nThe regulatory requirement to control life‑limited turbine engine components remains in force but has been moved to AD/ENG/7; owners, operators and maintenance organisations must consult AD/ENG/7 for current mandatory actions, retirement lives and compliance obligations."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a cancellation instrument with no operative scope. The original directive's scope (life limited components for TPE 331 engines) has been transferred to AD/ENG/7, but this document itself has no scope beyond recording the cancellation."},"complexity_factors":["Single operative word: 'CANCELLED'","No defined terms","No conditional logic or cross-references to other legislation sections","No substantive operative provisions remaining","Consists entirely of explanatory background text and cancellation notice"],"plain_english_summary":"**What this is:** This is a cancellation notice for an old aviation safety rule.\n\n**What it did:** The original rule (Airworthiness Directive AD/TPE 331/1) required owners and operators of AlliedSignal TPE 331 series turbine engines to track and manage \"life limited components\" — parts of the engine that must be replaced after a set number of flight hours or cycles, regardless of condition.\n\n**What changed:** This directive has been **cancelled**. The safety requirements it covered are now handled by a different rule: **AD/ENG/7**.\n\n**Who it affects:** Operators of aircraft using TPE 331 engines (common in regional airliners and agricultural aircraft). They must now follow AD/ENG/7 instead of this old directive.\n\n**Why it matters:** This is housekeeping for aviation safety regulations. Rather than having overlapping or outdated rules, CASA has consolidated engine life-limit requirements into a single, broader directive. Operators need to ensure they're complying with the current AD/ENG/7, not this cancelled version."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-1-amdt-5-life-limited-components","history":"/api/acts/ad-tpe-331-1-amdt-5-life-limited-components/history","analysis":"/api/acts/ad-tpe-331-1-amdt-5-life-limited-components/analysis","conflicts":"/api/acts/ad-tpe-331-1-amdt-5-life-limited-components/conflicts","importantCases":"/api/acts/ad-tpe-331-1-amdt-5-life-limited-components/important-cases","documents":"/api/acts/ad-tpe-331-1-amdt-5-life-limited-components/documents"}}