{"id":"F2011L01068","name":"AD/V2500/8 - High Pressure Turbine Disks","slug":"ad-v2500-8-high-pressure-turbine-disks","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":86873,"registerId":"commonwealth-F2011L01068-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"International Aero Engines AG V2500 Seri","sectionType":"division","heading":"International Aero Engines AG V2500 Series","content":"### International Aero Engines AG V2500 Series\n\n| AD/V2500/8 | High Pressure Turbine Disks | 12/2011 |\n| ---------- | --------------------------- | ------- |\n\n| Applicability: | International Aero Engines AG model V2500-A1.                                                                                                                                                                                                                                                 |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Unless already accomplished, perform the initial ultrasonic inspection of HPT stage 1 and 2 disks specified in FAA AD 99-25-03.Perform the repetitive ultrasonic inspections of HPT stage 1 and 2 disks specified in FAA AD 99-25-03.Note: IAE Service Bulletin No. V2500-ENG-72-0344 refers. |\n| Compliance:    | If the initial ultrasonic inspection has not been performed - before first flight after1 July 2011.Perform repetitive inspections on the occasions specified in FAA AD 99-25-03.                                                                                                              |\n|                | This Airworthiness Directive becomes effective on 24 June 2011.                                                                                                                                                                                                                               |\n| Background:    | FAA AD 99-25-03 was issued to prevent HPT disk fracture which could result in an uncontained engine failure and damage to the aeroplane.                                                                                                                                                      |\n\n![](image.001.png)\n\nGlen Steemson  \nDelegate of the Civil Aviation Safety Authority\n\n14 June 2011","sortOrder":0},{"sectionNumber":"AD/V2500/8","sectionType":"part","heading":"AD/V2500/8","content":"## AD/V2500/8","sortOrder":1},{"sectionNumber":"High Pressure Turbine Disks","sectionType":"part","heading":"High Pressure Turbine Disks","content":"## High Pressure Turbine Disks","sortOrder":2},{"sectionNumber":"12/2011","sectionType":"part","heading":"12/2011","content":"## 12/2011","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD adopts the inspection requirements of FAA AD 99-25-03 for HPT stage 1 and 2 disks on V2500-A1 engines without expanding the class of affected engines or adding new types of obligations. It sets Australian compliance dates (effective 24 June 2011; initial inspection before first flight after 1 July 2011) while deferring technical inspection procedures and intervals to the referenced FAA AD and IAE service bulletin (Requirement; Compliance; Background)."},"complexity_factors":["Cross-reference to FAA AD 99-25-03 for required inspections and intervals (Requirement). Reliance on an external (foreign) AD adds procedural dependency and requires operators to obtain and follow that document.","Applicability limited to IAE V2500-A1 engines (Applicability) — narrow technical scope but high operational impact for affected fleet.","Fixed compliance timing: initial ultrasonic inspection required before first flight after 1 July 2011 if not already done (Compliance), and AD effective date set at 24 June 2011 (Compliance).","Repetitive inspection obligation (Requirement/Compliance) creates ongoing maintenance scheduling and recordkeeping burdens for operators.","Reference to IAE Service Bulletin No. V2500-ENG-72-0344 (Requirement) delegates procedural detail to manufacturer guidance, concentrating technical decision‑making in those documents.","Safety rationale stated as prevention of disk fracture and uncontained engine failure (Background), which frames the inspections as risk‑mitigation measures with potential operational trade‑offs."],"plain_english_summary":"This directive requires initial and repeated ultrasonic inspections of high‑pressure turbine (HPT) stage 1 and 2 disks on International Aero Engines V2500‑A1 engines, applying the inspection intervals and procedures specified in FAA AD 99‑25‑03. It affects operators of aircraft with V2500‑A1 engines, must be done before the first flight after 1 July 2011 if not already completed, and aims to prevent HPT disk fracture and uncontained engine failure."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive with a clear, original purpose: mandating specific safety inspections for a particular engine model. There is no evidence of scope creep; it precisely targets the identified safety risk of HPT disk fractures without expanding into unrelated operational or maintenance requirements."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 1 defined term implicitly referenced (FAA AD 99-25-03 — the US regulation being adopted)","Simple conditional structure: single compliance deadline with one alternative path","No nested exceptions or complex cross-referencing beyond the single reference to the FAA AD and IAE Service Bulletin","Clear, directive language ('Unless already accomplished', 'before first flight after 1 July 2011')","Single applicability criterion (one engine model)"],"plain_english_summary":"The AD requires ultrasonic inspections of high‑pressure turbine (HPT) disks on V2500‑A1 engines—an initial one‑off check and ongoing repetitive scans—to detect cracks and prevent catastrophic HPT disk fractures. It applies to airlines, operators and maintenance engineers using V2500‑A1 (commonly on A320 family aircraft). It adopts the FAA’s safety measures to prevent uncontained engine failures; non‑compliance grounds an aircraft unairworthy."}},"importantCases":[],"_links":{"self":"/api/acts/ad-v2500-8-high-pressure-turbine-disks","history":"/api/acts/ad-v2500-8-high-pressure-turbine-disks/history","analysis":"/api/acts/ad-v2500-8-high-pressure-turbine-disks/analysis","conflicts":"/api/acts/ad-v2500-8-high-pressure-turbine-disks/conflicts","importantCases":"/api/acts/ad-v2500-8-high-pressure-turbine-disks/important-cases","documents":"/api/acts/ad-v2500-8-high-pressure-turbine-disks/documents"}}