{"id":"F2006B10643","name":"AD/HU 269/84 - Thrust Bearing Tube","slug":"ad-hu-269-84-thrust-bearing-tube","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116550,"registerId":"commonwealth-F2006B10643-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/84 - Thrust Bearing Tube","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)  Schweizer (Hughes) 269 Series Helicopters\n\n \n\nAD/HU 269/84 Thrust Bearing Tube 6/87\n\nApplicability: All model 269 helicopters.\n\n \n\nRequirement: Action in accordance with Schweizer Service Information Notice No. N-203.\n\n \n\nCompliance: At the next schedule inspection for Maintenance Release issue after 4 June 1987 and thereafter at each installation of the main rotor hub assembly.\n\n \n\nBackground:  Reports indicate that improper thrust bearing tubes have been installed during the installation of main rotor drive shaft and thrust bearing.\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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2071},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original technical safety scope addressing improper thrust bearing tube installation on Schweizer 269 helicopters. The requirements remain focused on the specific mechanical defect originally identified."},"complexity_factors":["Single external reference to Schweizer Service Information Notice No. N-203 without reproducing technical details","No defined terms, interpretation section, or legislative cross-references","Simple dual-trigger compliance (time-based deadline and recurring event-based)","No exceptions, exemptions, or nested conditional logic"],"plain_english_summary":"**What this does:** This is a safety rule (called an *Airworthiness Directive*) that mandates a specific maintenance check for certain helicopters to prevent mechanical failure.\n\n**Who it affects:** Owners and operators of all Schweizer (Hughes) model 269 series helicopters.\n\n**What you must do:** Follow the manufacturer's instructions in *Schweizer Service Information Notice No. N-203* regarding the thrust bearing tube. This must be completed:\n- At the next scheduled inspection for Maintenance Release issue after 4 June 1987; and\n- Every time the main rotor hub assembly is installed thereafter.\n\n**Why it matters:** Reports indicated that incorrect (improper) thrust bearing tubes were being installed during maintenance of the main rotor drive shaft. Using the wrong parts creates a serious risk of mechanical failure and potential accidents. This directive ensures the correct parts are inspected and installed properly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-84-thrust-bearing-tube","history":"/api/acts/ad-hu-269-84-thrust-bearing-tube/history","analysis":"/api/acts/ad-hu-269-84-thrust-bearing-tube/analysis","conflicts":"/api/acts/ad-hu-269-84-thrust-bearing-tube/conflicts","importantCases":"/api/acts/ad-hu-269-84-thrust-bearing-tube/important-cases","documents":"/api/acts/ad-hu-269-84-thrust-bearing-tube/documents"}}