{"id":"F2006B08489","name":"AD/CF6/51 - LPT Shroud - Replacement","slug":"ad-cf6-51-lpt-shroud-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51179,"registerId":"commonwealth-F2006B08489-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \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 CAR 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\nGeneral Electric Turbine Engines \\- CF6 Series","sortOrder":0},{"sectionNumber":"AD/CF6/51 LPT Shroud - Replacement 4/200","sectionType":"part","heading":"AD/CF6/51 LPT Shroud - Replacement 4/2003","content":"# AD/CF6/51 LPT Shroud \\- Replacement 4/2003\n\nApplicability: General Electric CF6-50 and CF6-80C2 engines as specified in the requirement document.\n\nRequirement: Action per the requirements of FAA AD 2003-02-07, Amdt 39-13024.\n\nCompliance: As detailed in the requirement document with revised effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 17 April 2003.\n\nBackground: Actions specified in this Directive improve the Low Pressure Turbine containment capability of the affected engines.\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 4 March 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 26 March 2003.","sortOrder":1}],"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":3,"scope_assessment":{"changed":false,"description":"This Directive adopts the corrective actions prescribed in FAA AD 2003-02-07 for the specified CF6-50 and CF6-80C2 engines (Requirement; Applicability). The text shows alignment with that FAA AD and does not expand affected engine types or introduce additional measures beyond referencing the FAA requirements; the only domestic modification stated is a revised effective date for this Directive (Compliance)."},"complexity_factors":["Cross-reference to external mandatory document: the AD requires 'Action per the requirements of FAA AD 2003-02-07, Amdt 39-13024' (Requirement). Dependence on that external text increases operational and interpretive complexity.","Applicability defined by referenced requirement document: engines affected are 'as specified in the requirement document' rather than fully listed in the AD itself (Applicability), so operators must consult the FAA document to confirm coverage.","Compliance timing delegated to referenced document with a revised effective date: 'As detailed in the requirement document with revised effective date of this Directive' (Compliance) — scheduling and phase‑in rely on that external schedule.","Technical nature of mandated work: replacement of an LPT shroud on CF6 turbine engines is a specialised maintenance action that imposes parts, labour, and downtime costs on operators (Applicability; Requirement; Background).","Issuing authority and legal basis: the AD is issued under 'subregulation 39.1 (1) of CAR 1998' by the CASA delegate (introductory paragraph). That establishes regulatory enforceability and delegate discretion to set corrective actions.","Minimal procedural detail in the AD text: the AD primarily points to the FAA AD for the required steps and compliance detail, creating reliance risk if the external document is updated or ambiguous (Requirement; Compliance).","Administrative notice: AD effective date and Gazette notification are specified ('becomes effective on 17 April 2003' and Gazette notice 26 March 2003), which creates firm legal deadlines for compliance planning (Compliance; final paragraph)."],"plain_english_summary":"This Airworthiness Directive requires operators of General Electric CF6‑50 and CF6‑80C2 engines to follow FAA AD 2003‑02‑07 and replace the low-pressure turbine (LPT) shroud to improve LPT containment. It is issued by the CASA delegate under subregulation 39.1(1) of CAR 1998 and takes effect 17 April 2003. Owners/operators must arrange and pay for the specified replacement work within the compliance windows set out in the referenced FAA/requirement document."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — a specific safety modification for specific engine models. It does not expand beyond its original purpose of mandating LPT shroud replacement."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined applicability criteria (engine models)","Single requirement: comply with external FAA document","No nested conditions or exceptions","No cross-references to other Australian legislation","Straightforward compliance timeline (single effective date)"],"plain_english_summary":"This mandatory safety order requires operators of specific General Electric CF6-50 and CF6-80C2 engines to replace low‑pressure turbine (LPT) shrouds to restore containment capability and prevent uncontained engine failures. It affects airlines, aircraft operators, and maintenance crews who must comply with the FAA's instructions by the deadlines.\n\nCASA is adopting the FAA directive (effective 17 April 2003), directing Australian operators to follow the FAA AD exactly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf6-51-lpt-shroud-replacement","history":"/api/acts/ad-cf6-51-lpt-shroud-replacement/history","analysis":"/api/acts/ad-cf6-51-lpt-shroud-replacement/analysis","conflicts":"/api/acts/ad-cf6-51-lpt-shroud-replacement/conflicts","importantCases":"/api/acts/ad-cf6-51-lpt-shroud-replacement/important-cases","documents":"/api/acts/ad-cf6-51-lpt-shroud-replacement/documents"}}