{"id":"F2006B10713","name":"AD/HU 369/50 - Main Rotor Hub Strap Pack Retention Bolts and Bushings - Inspection and Replacement","slug":"ad-hu-369-50-main-rotor-hub-strap-pack-retention-bolts-and-bushings-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116689,"registerId":"commonwealth-F2006B10713-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/50 - Main Rotor Hub Strap Pack Retention Bolts and Bushings - Inspection and Replacement","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 369/50 Main Rotor Hub Strap Pack Retention\n\nBolts and Bushings - Inspection and Replacement\n\nApplicability: All 500D Model 369D fitted with hub S/Nos 0001 to 1388. Document:  Hughes SIN No. DN-91.\n\nCompliance: Within 100 hours time in service after 30 September 1981, unless already accomplished within the last 200 hours time in service.\n\n# 9/81\n\n \n\nBackground: In service corrosion of the main rotor hub strap pack retention bolts and bushes may have occurred since installation.\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":2782},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope as a targeted safety fix for a specific mechanical defect (corrosion in rotor hub retention bolts) on specific helicopter models. There is no indication of scope expansion beyond the original airworthiness safety purpose."},"complexity_factors":["Single operative requirement with no subsections or nested conditions","No interpretation section or defined terms","Specific applicability limited to one aircraft model and specific serial number range","One external technical document reference requiring specialist knowledge to locate","Simple alternative compliance path (100 hours vs already completed within 200 hours)"],"plain_english_summary":"This mandatory Civil Aviation Safety Authority Airworthiness Directive requires owners/operators of McDonnell Douglas (Hughes) 500D Model 369D helicopters with main rotor hub serial numbers 0001–1388 to inspect and, if needed, replace main rotor hub strap pack retention bolts and bushings within 100 flight hours after 30 Sept 1981 (unless done within the prior 200 hours). Corrosion of these parts can cause catastrophic rotor failure; procedures are in Hughes Service Information Notice No. DN-91."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-50-main-rotor-hub-strap-pack-retention-bolts-and-bushings-inspection-and-replacement","history":"/api/acts/ad-hu-369-50-main-rotor-hub-strap-pack-retention-bolts-and-bushings-inspection-and-replacement/history","analysis":"/api/acts/ad-hu-369-50-main-rotor-hub-strap-pack-retention-bolts-and-bushings-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-hu-369-50-main-rotor-hub-strap-pack-retention-bolts-and-bushings-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-hu-369-50-main-rotor-hub-strap-pack-retention-bolts-and-bushings-inspection-and-replacement/important-cases","documents":"/api/acts/ad-hu-369-50-main-rotor-hub-strap-pack-retention-bolts-and-bushings-inspection-and-replacement/documents"}}