{"id":"F2006B10646","name":"AD/HU 269/87 - Tail Rotor Attachment Area","slug":"ad-hu-269-87-tail-rotor-attachment-area","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116556,"registerId":"commonwealth-F2006B10646-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/87 - Tail Rotor Attachment Area","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 269/87 Tail Rotor Attachment Area 10/87\n\nApplicability: All model 269C fitted with tailboom P/N 269A2320, and S/Nos S001 to S171. Requirement:              Action in accordance with Schweizer SIN N-200.\n\nCompliance: Within 100 hours time in service after 30 September 1987 or at the next scheduled inspection for Maintenance Release issue after 30 September 1987, whichever is later.\n\n \n\nBackground: A tail rotor drive shaft disengagement has revealed the possibility of an error in the location of five tail boom bolt holes at boom station 283.06. This could result in misalignment between the tail rotor drive shaft and the drive spline.\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":1940},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is the original 1987 issuance targeting a specific manufacturing defect in helicopter tailbooms. The scope remains tightly limited to the identified safety issue without expansion into broader operational requirements."},"complexity_factors":["Single-issue directive with only one required action","Precise applicability limited to specific part number and serial number range","Very short text with no defined terms section","Simple compliance deadline with only one conditional ('whichever is later')","External reference to single technical standard (SIN N-200)"],"plain_english_summary":"**What this requires:** Owners of specific Schweizer (Hughes) 269C helicopters must inspect the tail rotor attachment area and correct a manufacturing defect.\n\n**Who is affected:** Operators of Model 269C helicopters with tailboom part number 269A2320 and serial numbers S001 through S171.\n\n**The safety problem:** The factory drilled five bolt holes in the wrong location on the tailboom (at boom station 283.06). This misalignment could cause the tail rotor drive shaft to disconnect from its drive spline, potentially leading to complete loss of tail rotor control and a crash.\n\n**What you must do:** Follow the instructions in Schweizer Service Information Notice N-200 to inspect and rectify the issue.\n\n**Deadline:** Within 100 hours of flight time after 30 September 1987, or at the next scheduled inspection for your Maintenance Release (the official certificate allowing the aircraft to fly)—whichever occurs later."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-87-tail-rotor-attachment-area","history":"/api/acts/ad-hu-269-87-tail-rotor-attachment-area/history","analysis":"/api/acts/ad-hu-269-87-tail-rotor-attachment-area/analysis","conflicts":"/api/acts/ad-hu-269-87-tail-rotor-attachment-area/conflicts","importantCases":"/api/acts/ad-hu-269-87-tail-rotor-attachment-area/important-cases","documents":"/api/acts/ad-hu-269-87-tail-rotor-attachment-area/documents"}}