{"id":"F2006B07439","name":"AD/TPE 331/3 Amdt 4 - Engine Parts - Life Limitations","slug":"ad-tpe-331-3-amdt-4-engine-parts-life-limitations","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49734,"registerId":"commonwealth-F2006B07439-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/3 Amdt 4 - Engine Parts - Life Limitations","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 331/3\n\nAmdt 4\n\n\nEngine Parts - Life Limitations 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":false,"description":"The text cancels AD/TPE 331/3 Amdt 4 and states that the requirement for control of turbine engine life‑limited components is now covered by AD/ENG/7. The cancellation relocates the regulatory source but does not, in this text, expand or narrow the substantive subject matter; affected obligations are indicated to continue under AD/ENG/7 rather than under AD/TPE 331/3. (Background line.)"},"complexity_factors":["Single‑action instrument: cancellation of a specific AD (AD/TPE 331/3 Amdt 4).","Cross‑reference to another AD (AD/ENG/7) rather than setting substantive requirements.","No technical or procedural details included in the text itself.","Affects a defined technical subset (TPE 331 series engines), requiring consultees to read another instrument for operative content.","No penalties, dates, or transitional arrangements specified in the text provided."],"plain_english_summary":"This instrument cancels AD/TPE 331/3 (life‑limits for AlliedSignal TPE331 engines) and relocates the legal requirements for life‑limited engine parts to AD/ENG/7. Operators, maintenance organisations and engineers who relied on AD/TPE 331/3 must now consult and comply with AD/ENG/7 for tracking, retirement and other life‑limit obligations. The cancellation sets no fees; any compliance costs stem from the substantive rules in AD/ENG/7."},"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a cancellation instrument that explicitly narrows the scope to zero by revoking the previous directive. The original scope (life limits for TPE 331 engine parts) has been transferred to AD/ENG/7, but this document itself does not expand or alter scope — it terminates it."},"complexity_factors":["Document is a cancellation notice, not substantive legislation","No operative provisions or conditional logic","Single cross-reference to replacement directive (AD/ENG/7)","No defined terms or technical specifications in the operative text","Extremely short (under 100 words of substance)"],"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 331/3) set \"life limitations\" — strict expiry dates or usage limits — on parts for AlliedSignal TPE 331 series turbine engines (used in many small aircraft). These parts had to be replaced or inspected before reaching their limit, even if they looked fine.\n\n**What changed:** This rule has been **cancelled**. The safety requirements it covered are now handled by a different, broader rule: **AD/ENG/7**.\n\n**Who it affects:** Aircraft operators, maintenance engineers, and owners of planes with TPE 331 engines. They must now follow AD/ENG/7 instead of this old directive.\n\n**Why it matters:** This is housekeeping. Rather than having separate, overlapping rules for different engine types, the aviation regulator (CASA) has consolidated life-limit rules into one place. It doesn't remove safety requirements — it just moves them."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-3-amdt-4-engine-parts-life-limitations","history":"/api/acts/ad-tpe-331-3-amdt-4-engine-parts-life-limitations/history","analysis":"/api/acts/ad-tpe-331-3-amdt-4-engine-parts-life-limitations/analysis","conflicts":"/api/acts/ad-tpe-331-3-amdt-4-engine-parts-life-limitations/conflicts","importantCases":"/api/acts/ad-tpe-331-3-amdt-4-engine-parts-life-limitations/important-cases","documents":"/api/acts/ad-tpe-331-3-amdt-4-engine-parts-life-limitations/documents"}}