{"id":"F2010L02751","name":"AD/CF6/82 - High Pressure Compressor Disk Lock Slots","slug":"ad-cf6-82-high-pressure-compressor-disk-lock-slots","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":84706,"registerId":"commonwealth-F2010L02751-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"General Electric Turbine Engines - CF6 S","sectionType":"division","heading":"General Electric Turbine Engines - CF6 Series","content":"### General Electric Turbine Engines \\- CF6 Series\n\n| AD/CF6/82 | High Pressure Compressor Disk Lock Slots | 21/2010 |\n| --------- | ---------------------------------------- | ------- |\n\n| Applicability: | General Electric Company CF6 engines as specified in FAA AD 2000-11-12.                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Unless already accomplished, inspect in accordance with the requirements of FAA AD 2000-11-12.Repeat the inspections in accordance with the requirements of FAA AD 2000-11-12.Later revisions to Alert Service Bulletin GE CF6-50 ASB No. 72-A1144, Revision 1, dated May 13, 1999 that are approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2000-11-12, are considered acceptable for compliance with the equivalent Requirements of this AD. |\n| Compliance:    | As specified in the Requirement Document with a revised effective date of11 November 2010.                                                                                                                                                                                                                                                                                                                                                                                                                              |\n|                | This Airworthiness Directive becomes effective on 11 November 2010.                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| Background:    | This AD is prompted by reports of stage 14 High Pressure Compressor (HPC) disk lock slot cracks discovered during shop fluorescent penetrant inspections. The actions specified in this AD are intended to prevent stage 14 HPC disc failure, which could result in an uncontained engine failure and damage to the aircraft.                                                                                                                                                                                           |\n\n![](image.001.png)\n\nMike Higgins  \nDelegate of the Civil Aviation Safety Authority\n\n15 October 2010","sortOrder":0},{"sectionNumber":"AD/CF6/82","sectionType":"part","heading":"AD/CF6/82","content":"## AD/CF6/82","sortOrder":1},{"sectionNumber":"High Pressure Compressor Disk Lock Slots","sectionType":"part","heading":"High Pressure Compressor Disk Lock Slots","content":"## High Pressure Compressor Disk Lock Slots","sortOrder":2},{"sectionNumber":"21/2010","sectionType":"part","heading":"21/2010","content":"## 21/2010","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD adopts the inspection requirements of FAA AD 2000-11-12 and does not add new categories of action or broader applicability beyond that FAA directive; it defers acceptance of alternate procedures to FAA-approved AMOCs."},"complexity_factors":["Reliance on FAA AD 2000-11-12 for the substantive inspection requirements rather than reproducing procedures locally","Mandatory repeated inspections (ongoing compliance burden for operators)","Acceptance of later GE ASB revisions only if FAA approves them as an AMOC (delegated discretion to FAA for alternative compliance)","Applicability limited to CF6 engines as specified in the FAA AD (requires cross-referencing external document to determine affected equipment)","Enforcement and compliance logistics across operators and maintenance providers (costs for inspections and any repairs)","Fixed effective date (11 November 2010) which sets a clear compliance timeline"],"plain_english_summary":"This Airworthiness Directive requires operators of specified General Electric CF6 series engines to inspect and periodically re‑inspect the stage‑14 high‑pressure compressor disk lock slots for cracks, following FAA AD 2000-11-12. Later revisions to GE CF6-50 ASB No.72-A1144 are acceptable only if the FAA approves them as an Alternate Method of Compliance. Effective 11 November 2010. Operators pay inspection and repair costs; CASA enforces compliance and the FAA decides acceptable alternative procedures. The stated aim is to prevent disk failure and uncontained engine failure."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope. It addresses a specific safety defect in a specific engine component (stage 14 HPC disk lock slots) as identified in the original FAA directive. The Australian instrument simply adopts the American safety requirements without expanding the scope to other engine components or operational matters."},"complexity_factors":["Short, single-purpose directive focused on one specific mechanical component","Only 4 substantive sections (Applicability, Requirement, Compliance, Background)","Heavy reliance on external documents — compliance requires cross-referencing FAA AD 2000-11-12 and GE Service Bulletin CF6-50 ASB No. 72-A1144, meaning the full requirements are not contained in this document","No defined terms section — technical terms (HPC, lock slots, AMOC) are used without formal definitions within the instrument","Simple conditional structure: 'Unless already accomplished' is the only exception clause","Incorporation by reference creates accessibility issues — readers must obtain separate FAA and manufacturer documents to understand full compliance obligations"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires operators of General Electric CF6 engines to inspect the stage‑14 high‑pressure compressor disk lock slots for cracks, following procedures and intervals in FAA AD 2000‑11‑12. Repairs or replacements are required if cracks are found. It affects airlines and maintenance organisations using CF6‑powered wide‑body aircraft and aims to prevent uncontained engine failures that could endanger aircraft and passengers."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf6-82-high-pressure-compressor-disk-lock-slots","history":"/api/acts/ad-cf6-82-high-pressure-compressor-disk-lock-slots/history","analysis":"/api/acts/ad-cf6-82-high-pressure-compressor-disk-lock-slots/analysis","conflicts":"/api/acts/ad-cf6-82-high-pressure-compressor-disk-lock-slots/conflicts","importantCases":"/api/acts/ad-cf6-82-high-pressure-compressor-disk-lock-slots/important-cases","documents":"/api/acts/ad-cf6-82-high-pressure-compressor-disk-lock-slots/documents"}}