{"id":"F2006B10701","name":"AD/HU 369/4 - Main Rotor Locknut and Retaining Ring - Modification","slug":"ad-hu-369-4-main-rotor-locknut-and-retaining-ring-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116666,"registerId":"commonwealth-F2006B10701-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/4 - Main Rotor Locknut and Retaining Ring - Modification","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)  McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters\n\n \n\nAD/HU 369/4  Main Rotor Locknut and Retaining Ring - Modification\n\nApplicability: All models specified in Hughes SIN No. HN-11. Document:  Hughes SIN No. HN-11.\n\nCompliance: In accordance with 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\n \n\n \n\n \n\n \n\n \n\n\n6/70\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1566},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive remains tightly focused on its original technical safety purpose: mandating a specific hardware modification for the main rotor assembly of Hughes 369 helicopters. It has not expanded beyond this specific airworthiness issue."},"complexity_factors":["Extremely brief text with single operative requirement","No defined terms or interpretation section","No conditional logic, exceptions, or nested provisions","Incorporation by reference of external technical standard (Hughes SIN HN-11) without reproducing its content","Minimal cross-references (only to Civil Aviation Regulations Part 39 framework)"],"plain_english_summary":"This CASA Airworthiness Directive mandates a mechanical modification to the main rotor locknut and retaining ring on specified Hughes 369 series helicopters (per Hughes Service Information Notice HN‑11). It applies to owners/operators of the affected models and requires completing the modification before further flight. The change corrects a potential failure that could allow main rotor separation, preventing catastrophic loss of aircraft and life."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-4-main-rotor-locknut-and-retaining-ring-modification","history":"/api/acts/ad-hu-369-4-main-rotor-locknut-and-retaining-ring-modification/history","analysis":"/api/acts/ad-hu-369-4-main-rotor-locknut-and-retaining-ring-modification/analysis","conflicts":"/api/acts/ad-hu-369-4-main-rotor-locknut-and-retaining-ring-modification/conflicts","importantCases":"/api/acts/ad-hu-369-4-main-rotor-locknut-and-retaining-ring-modification/important-cases","documents":"/api/acts/ad-hu-369-4-main-rotor-locknut-and-retaining-ring-modification/documents"}}