{"id":"F2006B10626","name":"AD/HU 269/66 - Tail Rotor Swashplate Bearing Locknut - Increase in Torque","slug":"ad-hu-269-66-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repealed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":116515,"registerId":"commonwealth-F2006B10626-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/66 - Tail Rotor Swashplate Bearing Locknut -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)  Schweizer (Hughes) 269 Series Helicopters\n\n \n\nAD/HU 269/66 Tail Rotor Swashplate Bearing Locknut - Increase in Torque\n\n\n3/80\n\n \n\nApplicability: All model 269A, 269A-1 and 269B. Model 269C with S/Nos. 0004 through 0789. Document:               Hughes SIN N-163.\n\nCompliance: Within 100 hours time in service after 31 March 1980.\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":1493},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive remains a narrow, targeted safety intervention addressing a specific mechanical defect in identified helicopter models. It has not expanded beyond its original purpose of preventing tail rotor control failure through a simple torque specification change."},"complexity_factors":["Single, specific mechanical action required","Limited applicability with clearly defined model numbers and serial number ranges","No defined terms or interpretation sections","No conditional logic, exceptions, or nested requirements","Straightforward compliance deadline based on flight hours"],"plain_english_summary":"**What this does**\n\nThis is an Airworthiness Directive (a legally binding safety order) requiring owners of specific Schweizer (Hughes) 269 helicopters to tighten a particular nut more than originally specified.\n\n**The safety issue**\nThe tail rotor swashplate bearing locknut (a critical fastener that helps control the tail rotor) can work loose. If it loosens, the pilot could lose control of the tail rotor, causing the helicopter to spin uncontrollably and potentially crash.\n\n**Who is affected**\nOwners and operators of:\n- Hughes/Schweizer models 269A, 269A-1, and 269B\n- Model 269C with serial numbers 0004 through 0789\n\n**What you must do**\nIncrease the tightening torque (tightening force) on the tail rotor swashplate bearing locknut according to the manufacturer's instructions (Hughes Service Information Notice N-163).\n\n**When**\nWithin 100 hours of flight time after 31 March 1980."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-66-tail-rotor-swashplate-bearing-locknut-increase-in-torque","history":"/api/acts/ad-hu-269-66-tail-rotor-swashplate-bearing-locknut-increase-in-torque/history","analysis":"/api/acts/ad-hu-269-66-tail-rotor-swashplate-bearing-locknut-increase-in-torque/analysis","conflicts":"/api/acts/ad-hu-269-66-tail-rotor-swashplate-bearing-locknut-increase-in-torque/conflicts","importantCases":"/api/acts/ad-hu-269-66-tail-rotor-swashplate-bearing-locknut-increase-in-torque/important-cases","documents":"/api/acts/ad-hu-269-66-tail-rotor-swashplate-bearing-locknut-increase-in-torque/documents"}}