{"id":"F2006B06459","name":"AD/R44/1 - Cooling Fan","slug":"ad-r44-1-cooling-fan","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47929,"registerId":"commonwealth-F2006B06459-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/R44/1 - Cooling Fan","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Robinson R44 Series Helicopters\n\n \n\nAD/R44/1 Cooling Fan  1/95 DM\n\nApplicability: All R44 helicopters S/N 0006 through to 0122 not fitted with P/N D174-1 fanwheel at Rev G or later status.\n\n \n\nRequirement: Action in accordance with Robinson R44 Service Bulletin No 2. Compliance: Within 10 hours time in service from 25 November 1994.\n\nThereafter, reinspect at intervals not exceeding 25 hours time in service until Fanwheel P/N D174-1 at Rev G or later status has been fitted.\n\n \n\nBackground: Robinson has advised that cracks have been found on the forward face of the cooling fanwheel. This directive is being raised to ensure fanwheel integrity is maintained until a redesigned fanwheel can be installed.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1594},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains strictly limited to the original safety issue (cracking R44 cooling fanwheels) and the originally affected aircraft population. There has been no expansion into broader operational requirements or other helicopter models."},"complexity_factors":["Single, specific mechanical defect addressed (cooling fanwheel cracks)","Applicability limited to defined serial number range (S/N 0006-0122) and specific part number revisions","Straightforward compliance schedule based on 'time in service' flight hours","No cross-references to other legislative instruments or nested conditional provisions"],"plain_english_summary":"Owners/operators of Robinson R44 helicopters serials 0006–0122 (unless fitted with cooling fanwheel D174-1 Rev G or later) must begin regular inspections of the engine cooling fanwheel for cracks — initially within 10 flight hours after Nov 25, 1994, then every 25 flight hours — until the redesigned fanwheel is installed.  \n\nThis AD addresses discovered front-face cracking that could cause in-flight fanwheel failure, engine loss, or airframe damage, so recurring checks remain required until the safer replacement part is fitted."}},"importantCases":[],"_links":{"self":"/api/acts/ad-r44-1-cooling-fan","history":"/api/acts/ad-r44-1-cooling-fan/history","analysis":"/api/acts/ad-r44-1-cooling-fan/analysis","conflicts":"/api/acts/ad-r44-1-cooling-fan/conflicts","importantCases":"/api/acts/ad-r44-1-cooling-fan/important-cases","documents":"/api/acts/ad-r44-1-cooling-fan/documents"}}