{"id":"F2006B10750","name":"AD/HU 369/85 Amdt 1 - Main Rotor Blade Root Replacement","slug":"ad-hu-369-85-amdt-1-main-rotor-blade-root-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116761,"registerId":"commonwealth-F2006B10750-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/85 Amdt 1 - Main Rotor Blade Root Replacement","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nMcDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters\n\nAD/HU 369/85\n\nAmdt 1\n\n  \nMain Rotor Blade Root Replacement 4/93\n\nDM\n\nApplicability: All 369D, 369E, and 369F/FF series helicopters equipped with 369D21100-515 or 369D21102-501 Series main rotor blades.\n\nRequirement: Action in accordance with MDHC SIN DN-183.2, EN-75.2 and FN62.2. Compliance: Part I: Deleted \\- compliance with AD/HU 369/41 Amdt. 7 fulfils this requirement.\n\nPart II: Within 600 hours time in service after 04 October 1992 but not later than 30 September 1993.\n\nBackground: Undetected cracking of any of the main rotor blades root fittings lugs may lead to blade separation. At Amendment 1 the manufacturer has deleted the blade removal for inspection requirement, and removed the repetitive inspection to SBs DN-51.6, EN-42.4 and FN-31.4; (AD/HU 369/41 Amdt 7 refers).","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2596},"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"This amendment narrows the scope of the original directive by deleting Part I (blade removal for inspection) and removing repetitive inspection requirements, which are now handled under a separate directive (AD/HU 369/41 Amdt 7). The directive now focuses solely on the one-time replacement of blade root fittings rather than ongoing inspections."},"complexity_factors":["References to three external manufacturer technical documents (MDHC SIN DN-183.2, EN-75.2, FN62.2)","Cross-reference to another Airworthiness Directive (AD/HU 369/41 Amdt 7)","Dual-component compliance timeframe requiring calculation of both flight hours and calendar date","Technical aviation terminology requiring specialized knowledge (time in service, blade root fittings, Service Information Notices)","Amendment structure that deletes previous sections and modifies existing obligations"],"plain_english_summary":"This AD requires operators of McDonnell Douglas (Hughes) and Kawasaki 369D, 369E and 369F/FF helicopters with certain main rotor blades to replace the blade root fittings per the manufacturer’s service notices within 600 flight hours or by 30 September 1993. It’s issued to prevent catastrophic blade separation from undetected lug cracking."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-85-amdt-1-main-rotor-blade-root-replacement","history":"/api/acts/ad-hu-369-85-amdt-1-main-rotor-blade-root-replacement/history","analysis":"/api/acts/ad-hu-369-85-amdt-1-main-rotor-blade-root-replacement/analysis","conflicts":"/api/acts/ad-hu-369-85-amdt-1-main-rotor-blade-root-replacement/conflicts","importantCases":"/api/acts/ad-hu-369-85-amdt-1-main-rotor-blade-root-replacement/important-cases","documents":"/api/acts/ad-hu-369-85-amdt-1-main-rotor-blade-root-replacement/documents"}}