{"id":"F2006B10630","name":"AD/HU 269/70 - Main Rotor Thrust Bearing P/N 269A5050-73 - Inspection","slug":"ad-hu-269-70-main-rotor-thrust-bearing-p-n-269a5050-73-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116524,"registerId":"commonwealth-F2006B10630-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/70 - Main Rotor Thrust Bearing P/N 269A5050-73 - Inspection","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\n# AD/HU 269/70  Main Rotor Thrust Bearing P/N 269A5050-73 - Inspection\n\nApplicability: Models269A, 269A-1, 269B. Document:  Hughes SIN N-174.\n\nCompliance: Within 100 hours time in service after 31 May 1981.\n\n# 5/81\n\n \n\nBackground: A manufacturing defect may exist in main rotor thrust bearings within a specific serial number group.\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":1845},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope, addressing only the specific manufacturing defect in the main rotor thrust bearing P/N 269A5050-73 for the identified helicopter models."},"complexity_factors":["Single, specific compliance action (one inspection)","Narrow applicability limited to three helicopter models and one part number","Simple timeframe calculation (100 hours time-in-service after fixed date)","No exemptions, exceptions, or conditional provisions","Minimal cross-referencing (only to manufacturer service notice)"],"plain_english_summary":"This CASA Airworthiness Directive mandates a one-time inspection of the main rotor thrust bearing (P/N 269A5050-73) on Schweizer/Hughes 269A, 269A‑1 and 269B helicopters with bearings in the serial-number range specified by Hughes Service Information Notice N‑174. Owners/operators must inspect within 100 flight hours from 31 May 1981 to find a manufacturing defect that could cause catastrophic rotor failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-70-main-rotor-thrust-bearing-p-n-269a5050-73-inspection","history":"/api/acts/ad-hu-269-70-main-rotor-thrust-bearing-p-n-269a5050-73-inspection/history","analysis":"/api/acts/ad-hu-269-70-main-rotor-thrust-bearing-p-n-269a5050-73-inspection/analysis","conflicts":"/api/acts/ad-hu-269-70-main-rotor-thrust-bearing-p-n-269a5050-73-inspection/conflicts","importantCases":"/api/acts/ad-hu-269-70-main-rotor-thrust-bearing-p-n-269a5050-73-inspection/important-cases","documents":"/api/acts/ad-hu-269-70-main-rotor-thrust-bearing-p-n-269a5050-73-inspection/documents"}}