{"id":"F2006B10638","name":"AD/HU 269/79 Amdt 1 - Main Rotor Drive Shaft","slug":"ad-hu-269-79-amdt-1-main-rotor-drive-shaft","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116540,"registerId":"commonwealth-F2006B10638-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/79 Amdt 1 - Main Rotor Drive Shaft","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 269/79\n\nAmdt 1\n\n\nMain Rotor Drive Shaft 11/87\n\n \n\nApplicability: All model 269C Helicopters fitted with main rotor drive shafts Serial Nos. 6570,6573, 6574, 6575, 6604, 6616, 6617, 6622, 6623, 6624, 6625, 6641, 6642, 6643 and 6644.\n\nRequirement: Action in accordance with Schweizer Service Information No. N199-1. Compliance: At the next 300, 400, 600 or 1200 hour inspection, whichever comes first after\n\n30 June 1986.\n\n \n\nBackground: The heat treatment of the above main rotor drive shafts is suspect. Amendment 1 to this Directive references Revision 1 to the Requirement Document.\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":1873},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"Amendment 1 merely updates the referenced service document to Revision 1 without expanding the applicability. The directive remains narrowly targeted at the same 15 suspect drive shafts identified in the original 1979 issue."},"complexity_factors":["Enumerated list of 15 specific part serial numbers limiting applicability","Single external cross-reference to service bulletin N199-1","Straightforward compliance deadline tied to existing maintenance schedules"],"plain_english_summary":"This CASA aviation safety order requires inspection or replacement of certain main rotor drive shafts on Schweizer (Hughes) 269C helicopters due to a suspected heat‑treatment defect. It applies only to shafts with the listed serial numbers and directs operators to follow Schweizer Service Information No. N199‑1 (Rev 1) at the next scheduled 300/400/600/1200‑hour inspection after 30 June 1986. Failure could cause rotor loss and catastrophic accident."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-79-amdt-1-main-rotor-drive-shaft","history":"/api/acts/ad-hu-269-79-amdt-1-main-rotor-drive-shaft/history","analysis":"/api/acts/ad-hu-269-79-amdt-1-main-rotor-drive-shaft/analysis","conflicts":"/api/acts/ad-hu-269-79-amdt-1-main-rotor-drive-shaft/conflicts","importantCases":"/api/acts/ad-hu-269-79-amdt-1-main-rotor-drive-shaft/important-cases","documents":"/api/acts/ad-hu-269-79-amdt-1-main-rotor-drive-shaft/documents"}}