{"id":"F2006B02460","name":"AD/ARRIUS/5 - Turboshaft Engine Unairworthy","slug":"ad-arrius-5-turboshaft-engine-unairworthy","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41716,"registerId":"commonwealth-F2006B02460-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nTurbomeca Turbine Engines \\- Arrius Series","sortOrder":0},{"sectionNumber":"AD/ARRIUS/5 Turboshaft Engine Unairworth","sectionType":"part","heading":"AD/ARRIUS/5 Turboshaft Engine Unairworthy 8/2003","content":"# AD/ARRIUS/5 Turboshaft Engine Unairworthy 8/2003\n\nDM\n\nApplicability: Arrius 2F turboshaft engine serial number (S/N) 34084\\. Requirement: Remove Arrius 2F engine (S/N) 34084 from service.\n\nNote: DGAC AD U2003-219(A) refers.\n\nCompliance: Before further flight.\n\nThis Airworthiness Directive becomes effective on 2 July 2003.\n\nBackground: This engine may have been damaged during its theft whilst in transport to the overhaul facility.\n\n![](image.002.png)  \n\nJim Coyne\n\nDelegate of the Civil Aviation Safety Authority 26 June 2003\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a standard emergency airworthiness directive with appropriately narrow scope. It targets a single unsafe condition (potential theft damage) for a single identified engine. No scope creep is evident."},"complexity_factors":["Single, unambiguous requirement applying to one specific serial number","No defined terms requiring interpretation","No cross-references to other legislation (only a reference to a French DGAC directive for information)","No conditional logic or exceptions","Extremely short document (under 150 words of substantive content)","Immediate compliance with no alternative methods of compliance stated"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a safety order issued by Australia's aviation regulator (CASA) telling aircraft operators to ground a specific engine immediately.\n\n**Who it affects:** Anyone operating an aircraft with a **Turbomeca Arrius 2F turboshaft engine** with **serial number 34084**.\n\n**What it requires:** \n- **Remove this specific engine from service immediately** — before the aircraft flies again.\n- No inspections, no repairs, no exceptions. The engine is deemed unsafe to fly.\n\n**Why it matters:** \nThe engine was stolen while being transported to an overhaul facility. CASA suspects it may have been damaged during the theft, making it potentially dangerous. Rather than risk a mechanical failure in flight, the regulator has banned this specific engine from use until further notice.\n\n**Key point:** This is a **targeted emergency directive** — it applies to only one specific engine in the world, not all Arrius engines."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD's scope is limited to Arrius 2F engine S/N 34084 as stated. The text shows no expansion or narrowing beyond that single serial-number action; the stated purpose (possible damage during theft) matches the required removal."},"complexity_factors":["Extremely narrow applicability — a single engine identified by serial number (Applicability line).","Single, clear mandatory action: remove engine from service (Requirement line).","Urgent, simple compliance timeframe: 'Before further flight' (Compliance line) increases immediacy but not procedural complexity.","Limited technical detail in the AD — no inspection or repair instructions provided; reference to DGAC AD U2003-219(A) suggests external technical guidance is required (Note line).","Issued under a routine administrative power (subregulation 39.1(1) of CASR 1998) — standard enforcement mechanism cited in preamble."],"plain_english_summary":"This directive requires removal from service of a specific Turbomeca Arrius 2F turboshaft engine (serial number 34084). Compliance requires removal before further flight, which operators must execute at their own cost.\n\nCASA’s delegate issued the AD because the engine may have been damaged during theft while in transit to an overhaul facility. It applies only to that serial number and mandates immediate grounding pending further inspection or corrective action."}},"importantCases":[],"_links":{"self":"/api/acts/ad-arrius-5-turboshaft-engine-unairworthy","history":"/api/acts/ad-arrius-5-turboshaft-engine-unairworthy/history","analysis":"/api/acts/ad-arrius-5-turboshaft-engine-unairworthy/analysis","conflicts":"/api/acts/ad-arrius-5-turboshaft-engine-unairworthy/conflicts","importantCases":"/api/acts/ad-arrius-5-turboshaft-engine-unairworthy/important-cases","documents":"/api/acts/ad-arrius-5-turboshaft-engine-unairworthy/documents"}}