{"id":"F2006L03206","name":"AD/CF6/54 - High Pressure Turbine Disc - CANCELLED","slug":"ad-cf6-54-high-pressure-turbine-disc-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":60524,"registerId":"commonwealth-F2006L03206-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CF6/54 - High Pressure Turbine Disc - CANCELLED","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 20.2\ntitle: AIRCRAFT\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\n \n\nAIRWORTHINESS DIRECTIVE\n\nOn the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive AD/CF6/54.\n\n### General Electric Turbine Engines - CF6 Series\n\n| AD/CF6/54 | High Pressure Turbine Disc | 11/2006 |\n| --- | --- | --- |\n\n\n \n\n| Requirement: | CANCELLED. |\n| --- | --- |\n|  | This AD is cancelled on 26 October 2006. |\n| Background: | The requirements of this AD have been superseded by those detailed in AD/CF6/62. |\n\n\n![](image.001.png)\n\nJames Coyne  Delegate of the Civil Aviation Safety Authority\n\n13 September 2006\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1678},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The instrument performs exactly as indicated by its title and classification—it cancels a specific Airworthiness Directive. There is no expansion of scope beyond the stated revocation."},"complexity_factors":["Single operative provision (cancellation of one previous directive)","No defined terms or interpretation section","No conditional logic, exceptions, or triggers","Only cross-references one other document (AD/CF6/62)","Document length is approximately 100 words"],"plain_english_summary":"This document officially **cancels a previous aviation safety rule**.\n\n**What it does**\n* **Revokes** Airworthiness Directive AD/CF6/54—a mandatory safety instruction that required specific maintenance actions on **high-pressure turbine discs** (critical spinning parts inside jet engines) for General Electric CF6 engines.\n* **Switches to a new rule:** The old requirements are replaced by a newer directive, AD/CF6/62, which covers the same safety issues.\n\n**Who it affects**\nAirlines, maintenance companies, and aircraft owners operating planes with General Electric CF6 engines (commonly found on Boeing 747, 767, and Airbus A300/A330 aircraft).\n\n**Why it matters**\nFrom **26 October 2006**, operators no longer need to follow the technical requirements of the old directive (AD/CF6/54). However, they must comply with the replacement directive (AD/CF6/62) instead. This is essentially administrative housekeeping—removing an outdated safety instruction that has been superseded by a more comprehensive one."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cf6-54-high-pressure-turbine-disc-cancelled","history":"/api/acts/ad-cf6-54-high-pressure-turbine-disc-cancelled/history","analysis":"/api/acts/ad-cf6-54-high-pressure-turbine-disc-cancelled/analysis","conflicts":"/api/acts/ad-cf6-54-high-pressure-turbine-disc-cancelled/conflicts","importantCases":"/api/acts/ad-cf6-54-high-pressure-turbine-disc-cancelled/important-cases","documents":"/api/acts/ad-cf6-54-high-pressure-turbine-disc-cancelled/documents"}}