{"id":"F2006B07428","name":"AD/TPE 331/2 - Engine Parts - Time Limitations","slug":"ad-tpe-331-2-engine-parts-time-limitations","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49698,"registerId":"commonwealth-F2006B07428-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/2 - Engine Parts - Time 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 331/2 Engine Parts - Time Limitations 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":3,"scope_assessment":{"changed":false,"description":"The stated substantive regulatory objective — control of turbine engine life‑limited components for the TPE331 series — is not removed by this instrument. Instead, the directive is cancelled and the requirement is said to be covered by AD/ENG/7 (Background). That indicates an administrative reallocation of where the requirement is published rather than a substantive elimination of the requirement. The instrument does not itself alter technical limits, timelines, or responsibilities; it directs stakeholders to a different AD for those details."},"complexity_factors":["Very short instrument: text only cancels the previous AD and cross‑refers to AD/ENG/7, providing no technical detail.","Reliance on an external instrument (AD/ENG/7) increases complexity for users because they must consult a separate directive to learn substantive requirements.","Regulatory context reference (Civil Aviation Regulations 1998, Part 39) means enforcement and amendment procedures sit in the broader regulatory framework, requiring cross‑consultation.","No transitional or implementation details provided in this notice, creating potential for short‑term ambiguity about timing or differences between the cancelled AD and AD/ENG/7.","Limited scope in the text reduces statutory complexity but raises practical compliance complexity for operators who must track multiple ADs."],"plain_english_summary":"The instrument cancels AD/TPE 331/2 (the TPE331 \"Engine Parts – Time Limitations\" directive) and directs operators to AD/ENG/7 for mandatory control of life‑limited turbine engine parts. It affects aircraft operators, maintenance organisations and owners of AlliedSignal (Garrett/AiResearch) TPE331 engines and matters because it centralises life‑limit requirements under a single AD—an administrative change that shifts where compliance obligations are found, without itself listing new technical limits."},"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 (time limitations on TPE 331 engine parts) has been transferred to AD/ENG/7, but this document itself does not represent scope creep — it represents orderly consolidation of aviation safety regulations."},"complexity_factors":["Document is a cancellation notice, not operative legislation","No defined terms, operative provisions, or conditional logic","Single cross-reference to replacement directive (AD/ENG/7)","Extremely short (under 100 words of substantive content)","No exceptions, schedules, or technical appendices"],"plain_english_summary":"**What this is:** This is a cancelled Airworthiness Directive (AD) for a specific type of aircraft engine — the AlliedSignal (Garrett/AiResearch) TPE 331 series turbine engine.\n\n**What it used to do:** This directive (numbered AD/TPE 331/2, originally issued in March 1995) previously set time limits on how long certain engine parts could be used before they had to be replaced or inspected. These are called \"life-limited components\" — parts that can only fly for a set number of hours or cycles before they become unsafe.\n\n**What happened to it:** The directive has been **cancelled**. The rules it used to cover are now handled by a different directive: **AD/ENG/7**, which deals with life-limited components across engines more broadly.\n\n**Who it affects:** Aircraft operators and maintenance crews who use or work on TPE 331 engines. They no longer need to follow this specific directive but must comply with AD/ENG/7 instead.\n\n**Why it matters:** Airworthiness Directives are legally binding safety orders. When one is cancelled and replaced, operators must track the change to ensure they're following the current rules — not the old ones. This consolidation simplifies things by moving engine-specific rules into a general engine directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-2-engine-parts-time-limitations","history":"/api/acts/ad-tpe-331-2-engine-parts-time-limitations/history","analysis":"/api/acts/ad-tpe-331-2-engine-parts-time-limitations/analysis","conflicts":"/api/acts/ad-tpe-331-2-engine-parts-time-limitations/conflicts","importantCases":"/api/acts/ad-tpe-331-2-engine-parts-time-limitations/important-cases","documents":"/api/acts/ad-tpe-331-2-engine-parts-time-limitations/documents"}}