{"id":"F2006B10635","name":"AD/HU 269/76 - Main Rotor Damper Pitch Bearing Case - Inspection and Modification","slug":"ad-hu-269-76-main-rotor-damper-pitch-bearing-case-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116534,"registerId":"commonwealth-F2006B10635-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 269/76 - Main Rotor Damper Pitch Bearing Case - Inspection and 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)  Schweizer (Hughes) 269 Series Helicopters\n\n \n\nAD/HU 269/76 Main Rotor Damper Pitch Bearing\n\nCase - Inspection and Modification\n\n\n1/84\n\n \n\nApplicability: All model 269A, 269A-1 and 269B series and 269C serial number 0001 through 1165.\n\n \n\nDocument: Service information notice N-189.\n\n \n\nCompliance: As per requirement document effective after 31 January 1984.\n\n \n\nBackground: The manufacturer advises, that cracking around the damper attachment bolt hole can occur when torquing the attachment bolt nut, and has consequently introduced a dye penetrant inspection of this area after torque loading, until fitment of a spacer under the nut washer is accomplished.\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":2233},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original narrow scope targeting the specific safety defect in the main rotor damper pitch bearing case of identified helicopter models, without expanding to other aircraft systems or components."},"complexity_factors":["Narrow applicability limited to specific aircraft models and serial numbers (0001-1165)","Single maintenance task with a conditional endpoint (repeated inspections until modification completed)","Technical aviation terminology requiring specialist knowledge (dye penetrant inspection, torque loading, pitch bearing case)","No nested provisions, cross-references, or exceptions within the instrument itself"],"plain_english_summary":"This Airworthiness Directive is a mandatory safety notice for owners of specific Schweizer (Hughes) 269 series helicopters. **The problem:** When mechanics tighten the main rotor damper bolt, the surrounding metal can crack around the bolt hole. That's bad news for a helicopter—cracks in rotor components tend to end flights prematurely (and dramatically). **Who needs to act:** If you own or operate a model 269A, 269A-1, 269B, or early model 269C (serial numbers 0001 through 1165), this applies to you. **What you must do:** Every time you torque (tighten) that bolt, you must perform a dye penetrant inspection (a chemical process that makes surface cracks visible) on the pitch bearing case. You keep inspecting until you install a spacer under the nut washer—a one-time modification that fixes the underlying issue. **The paperwork:** Follow Service Information Notice N-189 for the technical details, and ensure compliance after 31 January 1984."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-269-76-main-rotor-damper-pitch-bearing-case-inspection-and-modification","history":"/api/acts/ad-hu-269-76-main-rotor-damper-pitch-bearing-case-inspection-and-modification/history","analysis":"/api/acts/ad-hu-269-76-main-rotor-damper-pitch-bearing-case-inspection-and-modification/analysis","conflicts":"/api/acts/ad-hu-269-76-main-rotor-damper-pitch-bearing-case-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-hu-269-76-main-rotor-damper-pitch-bearing-case-inspection-and-modification/important-cases","documents":"/api/acts/ad-hu-269-76-main-rotor-damper-pitch-bearing-case-inspection-and-modification/documents"}}