{"id":"F2010L02403","name":"AD/CF6/51 Amdt 2 - LPT Shroud - Replacement","slug":"ad-cf6-51-amdt-2-lpt-shroud-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":84312,"registerId":"commonwealth-F2010L02403-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/CF6/51 Amdt 2 | LPT Shroud - Replacement | 17/2010 |\n| ---------------- | ------------------------ | ------- |\n\n| Applicability: | General Electric CF6-50 and CF6-80C2 engines as specified in the requirement document.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action per the requirements of FAA AD 2003-02-07, Amdt 39-13024.Alternative Means of Compliance.The stage 2 LPT shroud 2083M12G02 and stage 3 LPT shroud 2083M13G02 released in Service Bulletin (SB) CF6-80C2 S/B 72-1224 dated 17 August 2006 are approved as an alternate means of compliance to paragraph (b) of FAA Airworthiness Directive (AD) 2003-02-07.The stage 2 LPT shroud 2092M11G01 released in SB CF6-80C2 S/B 72-1224 is approved as an alternate means of compliance to paragraph (a) of FAA AD2003-02-07 if used in conjunction with LPT case 1647M68G15 (CF6-80C2 SB72-0946), 2083M94G16 (CF6-80C2 SB 72-1171), or 1647M68G18 (CF6-80C2 SB 72-1170).Later revisions to SB CF6-80C2 S/B 72-1224 dated 17 August 2006, approved by the United States Federal Aviation Administration (FAA) as an Alternate Means of Compliance (AMOC) to FAA AD 2003-02-07, are considered acceptable for compliance with the equivalent Requirements of this AD. |\n| Compliance:    | As detailed in the requirement document with revised effective date of this Directive.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n|                | This Amendment becomes effective on 3 September 2010.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |\n| Background:    | Actions specified in this Directive improve the Low Pressure Turbine containment capability of the affected engines.Amendment 1 adds an alternative means of compliance. The manufacturer has developed other parts that have approved for fitment in lieu of those parts originally specified in FAA AD 2003-02-07.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n\n|     | Amendment 2 notates the acceptance of later revisions of the manufacturer’s data which are approved as an AMOC to FAA AD 2003-02-07. |\n| --- | ------------------------------------------------------------------------------------------------------------------------------------ |\n\n![](image.001.png)\n\n  \nMike Higgins  \nDelegate of the Civil Aviation Safety Authority\n\n24 August 2010","sortOrder":0},{"sectionNumber":"AD/CF6/51 Amdt 2","sectionType":"part","heading":"AD/CF6/51 Amdt 2","content":"## AD/CF6/51 Amdt 2","sortOrder":1},{"sectionNumber":"LPT Shroud - Replacement","sectionType":"part","heading":"LPT Shroud - Replacement","content":"## LPT Shroud - Replacement","sortOrder":2},{"sectionNumber":"17/2010","sectionType":"part","heading":"17/2010","content":"## 17/2010","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"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"The original AD/CF6/51 simply adopted the FAA directive requiring specific LPT shroud replacements. Amendment 1 expanded scope by adding alternative means of compliance (different parts that could be used). Amendment 2 further expanded scope by allowing 'later revisions' to the manufacturer's service bulletin to be automatically acceptable if approved by the FAA as an AMOC. This creates an open-ended compliance framework where future FAA-approved alternatives automatically become valid under the Australian directive without requiring specific Australian regulatory amendment."},"complexity_factors":["Heavy reliance on external documents: the directive incorporates by reference FAA AD 2003-02-07 and multiple Service Bulletins (SB CF6-80C2 S/B 72-1224, SB 72-0946, SB 72-1170, SB 72-1171) without reproducing their contents","Nested conditional compliance paths: operators must match specific part numbers (2083M12G02, 2083M13G02, 2092M11G01) with specific paragraph references in the FAA AD and potentially other case part numbers","Cross-referential structure: compliance requires understanding the relationship between the Australian AD, the FAA AD, manufacturer service bulletins, and AMOC approvals","Technical aviation terminology throughout (LPT shroud, AMOC, Service Bulletin) requiring domain knowledge","Amendment tracking: understanding this document requires knowing what changed from Amendment 1 (added alternative means of compliance) and original AD (FAA adoption)"],"plain_english_summary":"This CASA airworthiness directive makes FAA AD 2003-02-07 mandatory in Australia, requiring replacement or inspection of Low Pressure Turbine (LPT) shrouds on certain GE CF6-50 and CF6-80C2 engines. Amendment 2 permits use of newer, manufacturer-approved shrouds when accepted by the FAA as an Alternate Means of Compliance.\n\nIt affects airlines and maintenance organisations operating these engines; compliance improves debris containment and is required for legal operation in Australian airspace."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"Yes. Amendment 1 introduced alternative means of compliance (additional approved parts) and Amendment 2 expressly accepts later revisions of the manufacturer's service bulletin as FAA‑approved AMOCs, thereby expanding the set of acceptable parts and compliance methods compared with the original AD (Background; Requirement)."},"complexity_factors":["Cross-reference to FAA AD 2003-02-07 creates dependency on an external regulatory instrument and its AMOCs (Requirement).","Multiple specific part numbers and combinations listed (e.g. 2083M12G02, 2083M13G02, 2092M11G01) increase rule granularity (Requirement).","Conditional approval: some parts are approved only when used with specified LPT cases, adding combinatorial compliance checks (Requirement).","Acceptance of later revisions to a manufacturer service bulletin as AMOC delegates part of compliance verification to FAA approvals and SB revision history (Requirement; Background).","Limited procedural detail in the directive itself—compliance is 'as detailed in the requirement document'—shifts interpretive burden to external documents and operators (Compliance).","Effective-date and amendment history impose recordkeeping and version-control obligations on operators and maintainers (Compliance; Background)."],"plain_english_summary":"This directive requires operators of General Electric CF6-50 and CF6-80C2 engines to replace specified low‑pressure turbine (LPT) shrouds or follow FAA‑approved alternative parts and service bulletin revisions. Compliance is tied to FAA Airworthiness Directive AD 2003‑02‑07 and approved manufacturer service bulletins. It affects engine owners, maintenance organisations and parts suppliers because it mandates parts fitment or approved alternatives to improve LPT containment capability and becomes effective 3 September 2010."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf6-51-amdt-2-lpt-shroud-replacement","history":"/api/acts/ad-cf6-51-amdt-2-lpt-shroud-replacement/history","analysis":"/api/acts/ad-cf6-51-amdt-2-lpt-shroud-replacement/analysis","conflicts":"/api/acts/ad-cf6-51-amdt-2-lpt-shroud-replacement/conflicts","importantCases":"/api/acts/ad-cf6-51-amdt-2-lpt-shroud-replacement/important-cases","documents":"/api/acts/ad-cf6-51-amdt-2-lpt-shroud-replacement/documents"}}