{"id":"F2006B10707","name":"AD/HU 369/45 - Tail Rotor Swashplate Bearing Locknut - Increase in Torque","slug":"ad-hu-369-45-tail-rotor-swashplate-bearing-locknut-increase-in-torque","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116677,"registerId":"commonwealth-F2006B10707-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/45 - Tail Rotor Swashplate Bearing Locknut - Increase in Torque","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\n# AD/HU 369/45 Tail Rotor Swashplate Bearing Locknut - Increase in Torque\n\nApplicability: All models 369H series helicopters. Document: Hughes SIN No. HN-150.\n\nCompliance: Within 100 hours time in service after 31 March 1980.\n\n# 3/80\n\n \n\nBackground: To prevent loosening of the tail rotor swashplate bearing locknut and possible loss of tail rotor control, the tightening torque of the locknut is increased.\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":2008},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow technical scope concerning the specific locknut torque specification for the 369H helicopter tail rotor assembly. There is no evidence of scope expansion into unrelated maintenance areas or aircraft systems."},"complexity_factors":["Single, unambiguous operative requirement with no conditional clauses","No defined terms or interpretation section requiring legal analysis","Narrow applicability limited to one specific aircraft series (369H)","No cross-references to other legislative provisions beyond the enabling Part 39","Straightforward compliance timeline without exceptions, extensions, or alternative methods"],"plain_english_summary":"This **Airworthiness Directive (AD)** mandates a critical safety fix for specific helicopters to prevent catastrophic loss of control.\n\n**What it requires**\nOwners and operators of **McDonnell Douglas (Hughes) and Kawasaki 369H series helicopters** must increase the tightening torque (tightening force) applied to the **tail rotor swashplate bearing locknut** — essentially, tighten this specific nut more firmly than previously specified to ensure it stays secure during flight.\n\n**Why it matters**\nThe tail rotor controls the helicopter's steering (direction/yaw). If this locknut loosens in flight, the pilot could lose control of the tail rotor, potentially causing the aircraft to spin uncontrollably and crash. The directive references **Hughes Service Information Notice HN-150** for the exact technical procedure.\n\n**Who must comply**\nAll models of the **369H series helicopters**.\n\n**When**\nThe modification had to be completed within **100 hours of flight time** after 31 March 1980."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-45-tail-rotor-swashplate-bearing-locknut-increase-in-torque","history":"/api/acts/ad-hu-369-45-tail-rotor-swashplate-bearing-locknut-increase-in-torque/history","analysis":"/api/acts/ad-hu-369-45-tail-rotor-swashplate-bearing-locknut-increase-in-torque/analysis","conflicts":"/api/acts/ad-hu-369-45-tail-rotor-swashplate-bearing-locknut-increase-in-torque/conflicts","importantCases":"/api/acts/ad-hu-369-45-tail-rotor-swashplate-bearing-locknut-increase-in-torque/important-cases","documents":"/api/acts/ad-hu-369-45-tail-rotor-swashplate-bearing-locknut-increase-in-torque/documents"}}