{"id":"F2010L00072","name":"AD/PW4000/10 - Engine Stability Improvements - CANCELLED","slug":"ad-pw4000-10-engine-stability-improvements-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":122755,"registerId":"commonwealth-F2010L00072-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PW4000/10 - Engine Stability Improvements - 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/PW4000/10.\n\n### Pratt and Whitney Turbine Engines - PW 4000 Series\n\n| AD/PW4000/10 | Engine Stability Improvements | 1/2010 |\n| --- | --- | --- |\n\n\n \n\n| Requirement: | CANCELLED. |\n| --- | --- |\n|  | This AD is cancelled on 11 January 2010. |\n| Background: | The requirements of this AD have been superseded by AD/PW4000/12 Amdt 1. |\n\n\n![](image.001.png)\n\nMike Higgins  Delegate of the Civil Aviation Safety Authority\n\n5 January 2010\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2300},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument achieves its sole intended purpose: to revoke the previous Airworthiness Directive. The scope is limited to termination of AD/PW4000/10, which is clearly executed by referencing the superseding directive."},"complexity_factors":["Single operative provision (cancellation)","No conditional logic or exceptions","Only one cross-reference (to the superseding AD)","Extremely short length (under 150 words)"],"plain_english_summary":"This document **cancels** a previous aircraft safety rule about Pratt & Whitney PW4000 engines.\n\n**What it does:**\n- Revokes (cancels) Airworthiness Directive AD/PW4000/10, which previously required 'Engine Stability Improvements' for these turbine engines\n- The cancellation takes effect on 11 January 2010\n\n**Who it affects:**\n- Operators and maintenance organisations responsible for aircraft fitted with Pratt & Whitney PW4000 series engines\n\n**Why it matters:**\nThe safety requirements from the old rule haven't disappeared—they've simply moved to a newer directive (**AD/PW4000/12 Amdt 1**). This cancellation prevents confusion by ensuring operators follow only the current version of the safety requirements, not outdated duplicate rules."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pw4000-10-engine-stability-improvements-cancelled","history":"/api/acts/ad-pw4000-10-engine-stability-improvements-cancelled/history","analysis":"/api/acts/ad-pw4000-10-engine-stability-improvements-cancelled/analysis","conflicts":"/api/acts/ad-pw4000-10-engine-stability-improvements-cancelled/conflicts","importantCases":"/api/acts/ad-pw4000-10-engine-stability-improvements-cancelled/important-cases","documents":"/api/acts/ad-pw4000-10-engine-stability-improvements-cancelled/documents"}}