{"id":"F2010L02684","name":"AD/CF6/79 - Low Pressure Turbine","slug":"ad-cf6-79-low-pressure-turbine","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":84640,"registerId":"commonwealth-F2010L02684-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/CF6/79 | Low Pressure Turbine | 21/2010 |\n| --------- | -------------------- | ------- |\n\n| Applicability: | General Electric Company CF6 engines as specified in FAA AD 2005-07-05.                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Unless already accomplished, perform the initial inspection and action in accordance with the requirements of FAA AD 2005-07-05.Repeat the inspection and action in accordance with the requirements of FAA AD 2005-07-05.Later revisions to GE Alert Service Bulletin No CF6-50 S/B 72-A1251, dated September 24, 2003, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2005-07-05, 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 issued as a result from a report of a stud that separated from the turbine mid frame strut and from updated analysis of strut stud failures. Failure of the turbine mid frame strut studs could result in uncontained failure of the engine and possible damage to the aircraft.                                                                                                                                                                                                                                                          |\n\n![](image.001.png)\n\nMike Higgins  \nDelegate of the Civil Aviation Safety Authority\n\n8 October 2010","sortOrder":0},{"sectionNumber":"AD/CF6/79","sectionType":"part","heading":"AD/CF6/79","content":"## AD/CF6/79","sortOrder":1},{"sectionNumber":"Low Pressure Turbine","sectionType":"part","heading":"Low Pressure Turbine","content":"## Low Pressure Turbine","sortOrder":2},{"sectionNumber":"21/2010","sectionType":"part","heading":"21/2010","content":"## 21/2010","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":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific mechanical defect in a specific engine series. It does not expand beyond the original safety purpose of preventing turbine mid frame strut stud failures."},"complexity_factors":["Very short document (approximately 250 words)","Only 1 defined term implicitly referenced (FAA AD 2005-07-05)","Single mechanical issue addressed (turbine mid frame strut studs)","Compliance achieved by reference to external FAA document rather than detailed technical specifications within the AD itself","No nested exceptions or conditional logic — straightforward 'inspect and repeat' requirement","One alternative compliance pathway permitted (later revisions to GE service bulletin)"],"plain_english_summary":"This AD mandates inspections of the low-pressure turbine mid-frame strut studs on certain General Electric CF6 engines to detect cracking that could lead to studs breaking off and causing uncontained engine failure. Operators must carry out initial and recurring inspections and repairs per FAA instructions.\n\nIt affects airlines and maintenance organisations operating CF6-equipped wide-body aircraft and allows use of updated GE service bulletins as an approved compliance option."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope aligns with the FAA AD cited and is limited to General Electric CF6-series engines; the instrument does not broaden affected engines or add new types of obligations beyond adopting the FAA AD requirements. It does allow later GE Alert Service Bulletin revisions approved by the FAA as acceptable AMOCs, which permits updated compliance methods but does not expand the regulated population (Applicability; Requirement)."},"complexity_factors":["Dependence on an external FAA AD for the substantive inspection and corrective-action requirements (Applicability; Requirement).","Acceptance of later revisions to GE Alert Service Bulletin as FAA‑approved AMOCs introduces an external approval dependency (Requirement).","Technical nature of required inspections and potential need for engine disassembly or parts replacement increases operational complexity for affected operators (Requirement; Background).","Clear limited applicability to CF6-series engines keeps regulatory scope narrow but requires operators to confirm engine model applicability (Applicability).","Fixed effective/compliance date creates a hard administrative deadline for operators to meet (Compliance)."],"plain_english_summary":"Requires operators of General Electric CF6-series engines to carry out the initial and recurring inspections and remedial actions for low-pressure turbine mid‑frame strut studs as set out in FAA AD 2005‑07‑05. The rule accepts later GE Alert Service Bulletin revisions approved by the FAA as alternative compliance. It targets CF6 engine operators because stud separation could cause uncontained engine failure; compliance timing and procedures follow the referenced FAA AD and take effect 11 November 2010."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf6-79-low-pressure-turbine","history":"/api/acts/ad-cf6-79-low-pressure-turbine/history","analysis":"/api/acts/ad-cf6-79-low-pressure-turbine/analysis","conflicts":"/api/acts/ad-cf6-79-low-pressure-turbine/conflicts","importantCases":"/api/acts/ad-cf6-79-low-pressure-turbine/important-cases","documents":"/api/acts/ad-cf6-79-low-pressure-turbine/documents"}}