{"id":"F2006B07541","name":"AD/V2500/1 - Critical Life Limited Parts","slug":"ad-v2500-1-critical-life-limited-parts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50112,"registerId":"commonwealth-F2006B07541-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\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\nInternational Aero Engines AG V2500 series","sortOrder":0},{"sectionNumber":"AD/V2500/1 Critical Life Limited Parts 1","sectionType":"part","heading":"AD/V2500/1 Critical Life Limited Parts 10/2004","content":"# AD/V2500/1 Critical Life Limited Parts 10/2004\n\nApplicability: International Aero Engines AG (IAE) V2500-A1, V2522-A5, V2524-A5, V2525-D5, V2527- A5, V2527E-A5, V2527M-A5, V2528-D5, V2530-A5, and V2533-A5\n\nturbofan engines.\n\nNote 1: These engines are installed on, but not limited to, Airbus Industrie A319, A320, and A321 series, and McDonnell Douglas MD-90 aeroplanes.\n\nRequirement: Revise the Airworthiness Limitations Section (ALS) and Maintenance Scheduling Section (MSS) of the Instructions for Continued Airworthiness (ICA) located in the Time Limits Manual (Chapter 05- 10-00) of the Engine Manuals, part number (P/N) E-V2500-1IA and P/N E-V2500-3IA, and for air carrier operations revise the approved continuous airworthiness maintenance program, by\n\n    (a) Adding the following to paragraph 1, entitled \"Airworthiness Limitations:\" \"Refer to paragraph 2--Maintenance Scheduling for information that sets forth the operator's maintenance requirements for the V2500 On-Condition engine.\"\n\n    (b) Adding the following to paragraph 2, entitled \"Maintenance Scheduling:\"\n\n\"Whenever a Group A part identified in this paragraph (see 4.0 for definition of Group A) satisfies both of the following conditions:\n\nThe part is considered completely disassembled when accomplished in accordance with the disassembly instructions in the engine manufacturer's engine manual; and\n\nThe part has accumulated more than 100 cycles in service since the last piece- part opportunity inspection, provided that the part was not damaged or related to the cause for its removal from the engine; then that part is considered to be at the piece-part level and it is mandatory to perform the inspections for that part as specified in the following table:","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"This AD stays within the original safety-focused scope typical of airworthiness directives: it prescribes additional inspection obligations for certain life-limited (Group A) engine components. It does not broaden the subject matter beyond correcting an identified unsafe condition for the listed V2500 engines; rather, it specifies when deeper, piece-part inspections are mandatory (by adding conditions and cross-references to the existing engine manuals). There is no clear expansion beyond that original technical safety purpose in the text provided."},"complexity_factors":["Multiple specified engine models (11 V2500 variants listed) and aircraft types referenced (Applicability; Note 1).","Requirement to amend two distinct manual sections (Airworthiness Limitations Section and Maintenance Scheduling Section) and operators' approved continuous airworthiness maintenance programs (Requirement (a) and (b)).","Conditional logic with two conjunctive conditions to trigger mandatory inspections: (i) 'completely disassembled' per manufacturer's instructions; and (ii) '>100 cycles since last piece-part opportunity inspection' with exception for parts removed due to damage (Requirement (b)).","Cross-reference to another paragraph for a key definition ('Group A' referenced at paragraph 4.0) — meaning readers must consult other sections to apply the AD.","Reference to an inspection table (not reproduced here) that sets out required inspections and intervals, so full compliance requires consulting that table and the engine Time Limits Manual (Chapter 05-10-00).","Dependency on specific engine manual part numbers (P/N E-V2500-1IA and P/N E-V2500-3IA), requiring exact-document control and coordination.","Operator-specific approval process: air carriers must revise their regulator-approved maintenance programs, introducing administrative steps and regulator discretion.","Technical interpretation required for 'completely disassembled' and 'piece-part level' which depends on manufacturer's procedural detail and maintenance practice."],"plain_english_summary":"**What this Airworthiness Directive (AD) does**\n\n- Requires operators of certain International Aero Engines (IAE) V2500 turbofan engines to change parts of the engine maintenance manuals and, for air carriers, their approved maintenance programs. Specifically, it amends the Airworthiness Limitations Section (ALS) and the Maintenance Scheduling Section (MSS) in the engine Time Limits Manual (Chapter 05-10-00) of engine manuals P/N E-V2500-1IA and P/N E-V2500-3IA. (Requirement (a) and (b))\n\n- Establishes a rule for when a listed \"Group A\" part must be treated at the \"piece-part level\" and inspected. A Group A part meets this mandatory piece-part inspection requirement only when both conditions are met: (1) the part has been completely disassembled in accordance with the engine manufacturer's disassembly instructions; and (2) the part has accumulated more than 100 cycles in service since the last piece-part opportunity inspection, provided the part was not removed because of damage or an event that caused its removal. When those two conditions apply, the operator must perform the inspections specified in the AD's table. (Requirement (b))\n\n**Who this affects**\n\n- Operators and owners of aircraft fitted with IAE V2500-A1, V2522-A5, V2524-A5, V2525-D5, V2527-A5, V2527E-A5, V2527M-A5, V2528-D5, V2530-A5 and V2533-A5 engines (Note 1 lists typical aircraft types such as Airbus A319/A320/A321 and MD-90).\n- Maintenance organisations and engineers who service these engines and who must follow the engine manufacturer's disassembly instructions and perform the piece-part inspections.\n- Air carriers, because they must amend their approved continuous airworthiness maintenance program to reflect these inspection requirements.\n\n**Why it matters (mechanics and immediate effect)**\n\n- The AD sets a clear procedural trigger for deeper \"piece-part\" inspections of certain life-limited (Group A) components after they have been disassembled and have exceeded a defined usage threshold (>100 cycles since the last piece-part inspection). The intent (as stated in the AD background) is to correct an unsafe condition by ensuring more detailed inspection at the component level in specified circumstances.\n\n**How the AD operates in practice (steps required)**\n\n1. Operators revise the ALS wording to cross-reference the Maintenance Scheduling paragraph. (Requirement (a))\n2. Operators revise the MSS to include the new rule explaining when a Group A part is at the piece-part level and must have the inspections listed in the AD's table. (Requirement (b))\n3. Air carriers must submit revisions to their approved continuous airworthiness maintenance program to incorporate these inspection requirements.\n4. Maintenance organisations must follow the manufacturer's disassembly instructions to determine whether a part is \"completely disassembled\" and then apply the >100 cycles criterion to decide whether mandatory piece-part inspections are required.\n\n**Costs, incentives and trade-offs**\n\n- Who pays: Operators (airlines, aircraft owners) pay the direct costs: additional inspections, possible additional labour, paperwork to revise manuals and approved programs, and potential aircraft downtime while inspections occur.\n- Who decides and enforces: The CASA delegate issues and enforces the AD; operators decide how to implement the inspections and whether to remove/replace parts or perform the mandated inspections.\n- Compliance burden: Administrative work to revise manuals and approved programs, training for maintenance staff on new procedures, extra inspection labour, and record-keeping for piece-part inspections.\n- Opportunity costs: Time and resources spent on these inspections are not available for other maintenance activities; operators may incur delays or have to adjust spares inventory policies.\n- Behavioural effects: Operators may choose to perform more frequent disassembly/inspections, or conversely replace parts instead of incurring inspection costs (which could increase spare-parts demand). Maintenance providers with more efficient inspection processes may gain a competitive edge.\n- Implementation risk and ambiguity: Determination of \"completely disassembled\" depends on following the manufacturer's disassembly instructions; the definition of \"Group A\" is located in paragraph 4.0 (cross-reference), so interpretation depends on that definition and the inspection table not reproduced here. These cross-references create room for differing operational interpretations and require careful alignment with the engine manual.\n\n**Concentrated benefits vs diffuse costs**\n\n- Benefits (safety assurance) are broadly diffuse (applies to the flying public and operators), while direct costs fall on a concentrated group (operators and maintenance organisations). The AD creates an enforceable duty that shifts operational costs to those certificated to operate and maintain the affected engines.\n\n**Bureaucratic discretion and approvals**\n\n- The AD requires operators to submit revisions to their approved continuous airworthiness maintenance programs for regulator approval. That approval process is a point of administrative discretion and potential delay.\n\n**Concrete references in the AD**\n\n- Applicability: lists specific IAE V2500 engine models and notes typical aircraft installations. (Applicability; Note 1)\n- Requirement (a): required text addition to ALS referencing Maintenance Scheduling.\n- Requirement (b): required text addition that triggers mandatory piece-part inspections when both the disassembly and >100 cycles conditions are met; it further cross-references paragraph 4.0 for the definition of \"Group A\" and an inspection table for inspection tasks and intervals.\n\nOverall, this AD mechanically amends the engine manuals and operators' maintenance programs to make specific, conditional piece-part inspections mandatory for certain Group A components after disassembly and a defined usage threshold. The principal trade-off is increased inspection/compliance cost and logistical burden for operators in exchange for reduced risk of undetected component deterioration."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This appears to be a standard, targeted airworthiness directive focused on a specific safety issue with defined engine models. The scope remains limited to maintenance procedure updates for the specified V2500 engine variants, consistent with typical AD purposes."},"complexity_factors":["Multiple specific engine model variants listed (10 different V2500 sub-models)","Cross-references to external technical documents (Engine Manuals P/N E-V2500-1IA and P/N E-V2500-3IA, Time Limits Manual Chapter 05-10-00)","Conditional logic with nested requirements: the inspection trigger requires BOTH complete disassembly AND 100+ cycles since last inspection, PLUS an exception (undamaged/not removed for cause)","Technical aviation terminology requiring domain knowledge (\"piece-part opportunity inspection\", \"On-Condition engine\", \"continuous airworthiness maintenance program\")","Reference to undefined \"Group A\" parts and a table not reproduced in the directive text itself"],"plain_english_summary":"This AD requires operators to revise maintenance manuals for certain V2500 engines to add a new mandatory inspection requirement for \"Group A\" life‑limited parts that are fully disassembled and have accumulated more than 100 flight cycles since their last detailed inspection.  \n\nIt affects airlines and maintenance organisations operating Airbus A319/A320/A321 and MD‑90 aircraft with the listed V2500 variants. The change matters because it forces inspections of critical rotating parts (e.g., disks/shafts) to reduce risk of undetected cracks and catastrophic engine failure."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-v2500-1-critical-life-limited-parts","history":"/api/acts/ad-v2500-1-critical-life-limited-parts/history","analysis":"/api/acts/ad-v2500-1-critical-life-limited-parts/analysis","conflicts":"/api/acts/ad-v2500-1-critical-life-limited-parts/conflicts","importantCases":"/api/acts/ad-v2500-1-critical-life-limited-parts/important-cases","documents":"/api/acts/ad-v2500-1-critical-life-limited-parts/documents"}}