{"id":"F2006B10591","name":"AD/HU 269/17 - Tail Rotor Transmission Housing - Inspection","slug":"ad-hu-269-17-tail-rotor-transmission-housing-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116445,"registerId":"commonwealth-F2006B10591-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/17 - Tail Rotor Transmission Housing - 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\nAD/HU 269/17 Tail Rotor Transmission Housing - Inspection 11/67\n\nApplicability: Models 269A and 269B fitted with mod. kit M10011. (Installation of low tip speed tail rotor).\n\n \n\nRequirement: After removal of the horizontal stabiliser, inspect the tail rotor transmission assembly housing for cracks originating from the stabiliser attachment bolt holes using a 10X glass.\n\n \n\nCompliance: As detailed in 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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1864},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a targeted airworthiness directive addressing a specific technical safety issue (crack detection in tail rotor transmission housings). It remains focused on its original narrow safety purpose and has not expanded beyond the specific mechanical component and aircraft models identified."},"complexity_factors":["Single, unambiguous requirement with no sub-clauses or exceptions","No defined terms or interpretation section","No cross-references to other legislative provisions","Narrow applicability limited to two specific helicopter models with a specific modification kit","Plain language procedural instruction"],"plain_english_summary":"**What this does:** This is a mandatory safety inspection rule for specific helicopters. It requires operators to check for cracks in the tail rotor transmission housing using a magnifying glass.\n\n**Who it affects:** Owners and operators of Schweizer (Hughes) 269A and 269B helicopters that have been fitted with modification kit M10011 (which installs a low tip speed tail rotor).\n\n**What must be done:** After removing the horizontal stabiliser (the small wing at the tail), the operator must inspect the tail rotor transmission assembly housing for cracks starting from the stabiliser attachment bolt holes. This inspection must be performed using a 10X magnifying glass (similar to a jeweller's loupe).\n\n**Why it matters:** Cracks in this housing could lead to tail rotor failure and potential loss of control of the aircraft. This directive ensures critical structural components are checked for fatigue or damage before they become dangerous."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-17-tail-rotor-transmission-housing-inspection","history":"/api/acts/ad-hu-269-17-tail-rotor-transmission-housing-inspection/history","analysis":"/api/acts/ad-hu-269-17-tail-rotor-transmission-housing-inspection/analysis","conflicts":"/api/acts/ad-hu-269-17-tail-rotor-transmission-housing-inspection/conflicts","importantCases":"/api/acts/ad-hu-269-17-tail-rotor-transmission-housing-inspection/important-cases","documents":"/api/acts/ad-hu-269-17-tail-rotor-transmission-housing-inspection/documents"}}