{"id":"F2006B07449","name":"AD/TPE 331/39 - Engine Parts - Life Limitation","slug":"ad-tpe-331-39-engine-parts-life-limitation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49775,"registerId":"commonwealth-F2006B07449-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/39 - Engine Parts - Life Limitation","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 331/39 Engine Parts - Life Limitation 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":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a cancellation notice with no operative scope. The original directive's scope (life limits for TPE 331 engine parts) has been absorbed into AD/ENG/7, but this document itself does not represent scope creep — it is simply a housekeeping instrument removing redundant requirements."},"complexity_factors":["Document is only 4 substantive lines long","No defined terms section","No conditional logic or cross-references to other legislation (only a simple pointer to AD/ENG/7)","Single, unambiguous action: cancellation of previous requirements","No operative provisions currently in force"],"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 (AD/TPE 331/39) set rules for how long certain parts of AlliedSignal TPE 331 turbine engines could be used before they had to be replaced. These are called \"life-limited components\" — parts that wear out and can't fly forever for safety reasons.\n\n**Why it's cancelled:** This directive is no longer in force. The rules about engine life limits have been moved to a different directive: **AD/ENG/7**. That newer directive now covers life-limited components across all turbine engines, not just this specific model.\n\n**Who it affects:** Aircraft operators and maintenance crews who use or work on TPE 331 series engines (commonly used in regional aircraft and agricultural planes). They must now follow AD/ENG/7 instead.\n\n**Why it matters:** This shows how aviation safety rules get updated and consolidated. Rather than having separate rules for every engine model, regulators bundle common requirements together. Operators need to track which directives are current to stay compliant."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The instrument cancels a TPE 331‑specific airworthiness directive and states that the control of turbine engine life‑limited components is now covered under AD/ENG/7. In other words, regulatory coverage has been moved from AD/TPE 331/39 to AD/ENG/7. The source does not include AD/ENG/7, so it cannot confirm whether the substantive scope has broadened, narrowed, or simply been re‑located; it only records that the locus of the requirement has shifted to AD/ENG/7."},"complexity_factors":["Very short, procedural text (cancellation notice) with no technical details","Primary effect is cross-referencing to another AD (AD/ENG/7), creating dependency on external document","No technical compliance requirements or timelines included in the source","Potential for administrative confusion during transition, but no statutory complexity within this instrument itself"],"plain_english_summary":"This notice cancels AD/TPE 331/39 for AlliedSignal (Garrett/AiResearch) TPE 331 engines and transfers control of life‑limited engine parts to AD/ENG/7. It affects operators, owners and maintenance organisations who must now follow and reference AD/ENG/7 for parts life limits, and CASA as regulator. Practically, it’s an administrative relabelling: update manuals, records and compliance checks to avoid confusion; any substantive duties depend on AD/ENG/7’s contents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-39-engine-parts-life-limitation","history":"/api/acts/ad-tpe-331-39-engine-parts-life-limitation/history","analysis":"/api/acts/ad-tpe-331-39-engine-parts-life-limitation/analysis","conflicts":"/api/acts/ad-tpe-331-39-engine-parts-life-limitation/conflicts","importantCases":"/api/acts/ad-tpe-331-39-engine-parts-life-limitation/important-cases","documents":"/api/acts/ad-tpe-331-39-engine-parts-life-limitation/documents"}}