{"id":"F2006B10759","name":"AD/HU 369/95 - Main Rotor Transmission - Clutch Bearing - Outer Race Change","slug":"ad-hu-369-95-main-rotor-transmission-clutch-bearing-outer-race-change","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56208,"registerId":"commonwealth-F2006B10759-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/95 - Main Rotor Transmission - Clutch Bearing - Outer Race Change","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 369/95 Main Rotor Transmission \\- Clutch\n\nBearing \\- Outer Race Change\n\n  \n8/98\n\nDM\n\nApplicability: Model 369, 369A, 369D,369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS, 500N,\n\nYOH-6A and OH-6A helicopters.\n\nRequirement: Inspect the overrunning clutch assembly outer race, part number (P/N) 369A5352, to determine its serial number (S/N) in accordance with paragraphs A thru’ C of the Accomplishment Instructions contained in McDonnell Douglas Helicopter Systems Service Information Notice HN-215.2, DN-156.2, EN-46.2, FN-34.2, NN-010, dated March 18 1997 (service information notice). Remove any overrunning clutch outer race, P/N 369A5352 having a serial number S/N of 0692 through 0927, and replace it with an airworthy overrunning clutch outer race P/N 369A5352-5, together with a wave washer, P/N W1593-018, in accordance with the service information notice.\n\nNote: FAA AD 98-09-02 Amdt 39-10481 refers.\n\nCompliance: Within 50 hours time in service from the effective date of this directive.\n\nThis airworthiness directive becomes effective on 20 May 1998.\n\nBackground: This AD supersedes AD/HU 369/75. The requirement of the directive is extended to replace all outer races with a certain serial number regardless of heat treatment code. The previous AD merely inspected the races and replaced a limited number subject to the heat treatment code. Experience in the USA has shown that failures have occurred regardless of heat treatment code and the FAA has now mandated that all outer races of a certain batch require replacement.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific safety defect in a specific helicopter series. While it supersedes an earlier directive (AD/HU 369/75), this represents a tightening of the same safety measure rather than scope creep. The replacement requirement is broader than the previous inspection-only approach, but this is a deepening of the original safety purpose, not an expansion into new regulatory territory."},"complexity_factors":["Single, specific mechanical component targeted (overrunning clutch outer race)","Clear serial number range provided (0692 through 0927) with explicit part numbers","Simple compliance trigger: 50 hours time in service from effective date","Only one cross-reference (to FAA AD 98-09-02) and one superseded directive noted","No nested definitions, conditional logic, or exceptions","Accomplishment instructions incorporated by reference to a single service bulletin (McDonnell Douglas Service Information Notice)","Total length: approximately 250 words"],"plain_english_summary":"This CASA Airworthiness Directive legally requires operators of specified McDonnell Douglas (Hughes) and Kawasaki 369/500-series helicopters to replace a known-faulty main rotor transmission overrunning-clutch outer race (P/N 369A5352, S/Ns 0692–0927) with an improved part (P/N 369A5352-5) and a new wave washer. \n\nWork must be done within 50 flight hours after 20 May 1998 because failures can interrupt rotor power; the AD closes a safety gap left by an earlier inspection-only rule."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This directive supersedes AD/HU 369/75 and expands scope by removing the heat‑treatment limitation: all overrunning clutch outer races with S/N 0692–0927 must be replaced, rather than replacing only those meeting a specific heat‑treatment code. The change increases the pool of affected parts and obliges more operators to procure replacements and schedule maintenance within the 50‑hour window."},"complexity_factors":["Technical specificity: mandates exact part numbers (P/N 369A5352 → P/N 369A5352-5) and a serial-number range (S/N 0692–0927) (Requirement).","Narrow applicability: lists multiple helicopter models (models 369, 369A, 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS, 500N, YOH-6A, OH-6A) increasing actor coordination (Applicability).","Short compliance window: mandatory action within 50 flight hours imposes operational scheduling and downtime costs (Compliance).","Dependency on manufacturer service information: work must follow instructions in multiple Service Information Notices, adding procedural dependence (Requirement).","Regulatory change: supersedes prior AD and broadens scope from conditional replacement (heat‑treatment based) to blanket replacement for the specified serial batch (Background).","Supply/logistics risk: requirement for a specific replacement part plus wave washer creates parts-procurement and inventory pressures.","Record and maintenance implications: inspection to determine S/N and replacement actions require maintenance records and part-tracking."],"plain_english_summary":"_Requires operators of specified Hughes/Kawasaki 369-series and OH-6 helicopters to inspect the overrunning clutch outer race (P/N 369A5352) and replace any with serial numbers 0692–0927 with a revised part (P/N 369A5352-5) and a wave washer within 50 flight hours. CASA's directive supersedes the prior AD and expands replacement to all affected races regardless of heat‑treatment code._\n\nStated purpose: address failures that occurred despite heat treatment (per FAA experience). Operators pay parts, labour and downtime and must complete the inspection and replacement within the 50‑hour compliance window."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-95-main-rotor-transmission-clutch-bearing-outer-race-change","history":"/api/acts/ad-hu-369-95-main-rotor-transmission-clutch-bearing-outer-race-change/history","analysis":"/api/acts/ad-hu-369-95-main-rotor-transmission-clutch-bearing-outer-race-change/analysis","conflicts":"/api/acts/ad-hu-369-95-main-rotor-transmission-clutch-bearing-outer-race-change/conflicts","importantCases":"/api/acts/ad-hu-369-95-main-rotor-transmission-clutch-bearing-outer-race-change/important-cases","documents":"/api/acts/ad-hu-369-95-main-rotor-transmission-clutch-bearing-outer-race-change/documents"}}