{"id":"F2006B08492","name":"AD/CF6/54 - High Pressure Turbine Disc","slug":"ad-cf6-54-high-pressure-turbine-disc","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51187,"registerId":"commonwealth-F2006B08492-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\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\nGeneral Electric Turbine Engines \\- CF6 Series","sortOrder":0},{"sectionNumber":"AD/CF6/54 High Pressure Turbine Disc 7/2","sectionType":"part","heading":"AD/CF6/54 High Pressure Turbine Disc 7/2004","content":"# AD/CF6/54 High Pressure Turbine Disc 7/2004\n\nApplicability: General Electric Company (GE) CF6-80 model turbine engines as specified in FAA AD 2004-04-07.\n\nRequirement: Action per the technical requirements of FAA AD 2004-04-07.\n\nNote 1: FAA AD 2004-04-07, Amdt 39-13488 refers.\n\nNote 2: This directive supersedes CASA AD/CF6/44 ( FAA AD 2001-10-07) and AD/CF6/50 ( FAA AD 2003-01-05).\n\nCompliance: As specified in the requirement document\n\nThis Airworthiness Directive becomes effective on 8 July 2004.\n\nBackground: CF6-80 engines have experienced uncontained high pressure turbine disc failures including one in Australia investigated by ATSB per report No. 200205780. This directive introduces inspection and rework procedures to minimise disc failures.\n\n![Signature of James Coyne Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nJames Coyne\n\nDelegate of the Civil Aviation Safety Authority 5 May 2004\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2024},"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This directive maintains its original scope as issued. It addresses the specific unsafe condition (turbine disc failures) through the standard airworthiness directive mechanism of adopting FAA technical requirements, without expanding beyond the original safety purpose."},"complexity_factors":["Incorporation by reference of external technical standard (FAA AD 2004-04-07) which contains detailed engineering specifications not reproduced in the directive","Technical aviation terminology requiring specialized aeronautical engineering knowledge (e.g., 'uncontained failures', 'high pressure turbine disc')","Supersedes two previous airworthiness directives (AD/CF6/44 and AD/CF6/50), requiring operators to track regulatory history","Applicability determined by specific engine model variants listed in a separate FAA document"],"plain_english_summary":"This CASA Airworthiness Directive orders urgent inspections and corrective action on General Electric CF6‑80 high‑pressure turbine discs to prevent uncontained disc failures.\n\nAircraft operators using these engines must follow the inspection and repair requirements of FAA AD 2004‑04‑07. Compliance prevents catastrophic engine explosions that could damage airframes, fuel systems or flight controls and avert crashes or loss of life."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf6-54-high-pressure-turbine-disc","history":"/api/acts/ad-cf6-54-high-pressure-turbine-disc/history","analysis":"/api/acts/ad-cf6-54-high-pressure-turbine-disc/analysis","conflicts":"/api/acts/ad-cf6-54-high-pressure-turbine-disc/conflicts","importantCases":"/api/acts/ad-cf6-54-high-pressure-turbine-disc/important-cases","documents":"/api/acts/ad-cf6-54-high-pressure-turbine-disc/documents"}}