{"id":"F2006B10761","name":"AD/HU 369/97 - Overrunning Clutch Assembly","slug":"ad-hu-369-97-overrunning-clutch-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56210,"registerId":"commonwealth-F2006B10761-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/97 - Overrunning Clutch Assembly","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 369/97 Overrunning Clutch Assembly 14/98\n\nDM\n\nApplicability: Model 369D, 369E, 369FF, 500N, AH-6 and MH-6 helicopters fitted with overrunning clutch assembly, part number (PN) 369F5450-501\n\nRequirement: Visually inspect the overrunning clutch retainer, P/N 269F5460-1, carrier, P/N 369F5461-1, housing, P/N 369F545-1, and pin, P/N MS16556-801, for clutch or carrier wear or pin damage in accordance with the Accomplishment Instructions in McDonnell Douglas Helicopter Service Information Notice No. DN-190, EN-83, FN- 70, NN-011, dated 25 July 1997.\n\nNote: FAA AD 98-21-12 refers.\n\nCompliance: From the effective date of this AD:\n\n    For clutch assemblies having less than 100 hours Time-in-Service (TIS), conduct the visual inspection before or upon reaching 100 hours TIS.\n\n    b. For clutch assemblies with having 100 or more hours TIS, conduct the visual inspection within 25 hours TIS.\n\n    c. Repeat the requirement at intervals not exceeding 100 hours TIS.\n\nNote: For the purpose of this Directive, TIS is the time in service since new or last overhaul.\n\n    d. If at any time the required inspections reveal wear or damage to components, replace those components with airworthy components prior to further flight.\n\nThis Airworthiness Directive becomes effective on 4 November 1998.\n\nBackground: A visual inspection is required for the components specified in the requirement section of this AD. An operator in the USA had experienced inflight vibrations and subsequent inspection found wear of the bearing retainer and outer race of the bearing. Inspections of three other overrunning clutches with the same P/N also indicated spinning of the retainer. This condition, if not corrected, could ultimately lead to loss of power to the rotor drive system.","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 Airworthiness Directive maintains its original narrow scope — addressing a specific mechanical defect in a defined helicopter series. There is no evidence of scope creep; it targets exactly the safety issue identified in the background (clutch retainer wear) without expanding into unrelated operational or maintenance requirements."},"complexity_factors":["Single, specific mechanical component targeted (overrunning clutch assembly)","Straightforward compliance timeline based on flight hours (Time-in-Service)","Only 4 specific part numbers referenced","Clear pass/fail outcome (inspect → replace if damaged)","No nested exceptions, conditional logic, or cross-references to other legislation beyond a single FAA reference note","Total length: approximately 250 words"],"plain_english_summary":"CASA requires owners/operators of McDonnell Douglas (Hughes) and Kawasaki 369-series helicopters fitted with overrunning clutch P/N 369F5450-501 to inspect the clutch assembly for wear, because worn retainers can freewheel and cause loss of rotor power. New/low-use clutches (<100 flight hours) must be inspected before 100 hours; those ≥100 hours within 25 hours; inspections repeat every 100 hours. If damage is found, replace the clutch parts before next flight."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope matches its stated purpose: it targets a specific component on listed models for recurring visual inspection and replacement where wear is found. The instrument does not expand applicability beyond the identified parts/models or add requirements beyond inspection and replacement as set out in the Requirement and Compliance sections."},"complexity_factors":["Narrow applicability — applies only to specific helicopter models and a single overrunning clutch part number (Applicability).","Clear, time‑based compliance schedule tied to Time‑in‑Service (TIS) with three separate triggers (Compliance a–c).","Technical inspection requirements reference manufacturer's service information for execution details (Requirement; Accomplishment Instructions in McDonnell Douglas Service Information Notice No. DN-190).","Mandatory replacement prior to further flight if wear/damage found increases immediate operational cost and grounding risk (Compliance d).","Safety rationale is specific and concrete (Background: inflight vibrations and wear observed), reducing interpretive ambiguity but increasing urgency of compliance."],"plain_english_summary":"This Airworthiness Directive requires operators of specified McDonnell Douglas (Hughes) and Kawasaki 369-series helicopters fitted with overrunning clutch assembly PN 369F5450-501 to perform scheduled visual inspections of the clutch retainer, carrier, housing and pin and to replace any worn or damaged parts before further flight. Inspections are governed by time‑in‑service: inspect before/at 100 TIS if under 100 TIS, within 25 hours if already ≥100 TIS, then repeat every 100 hours; operators must follow the manufacturer's service notice cited in the AD."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-97-overrunning-clutch-assembly","history":"/api/acts/ad-hu-369-97-overrunning-clutch-assembly/history","analysis":"/api/acts/ad-hu-369-97-overrunning-clutch-assembly/analysis","conflicts":"/api/acts/ad-hu-369-97-overrunning-clutch-assembly/conflicts","importantCases":"/api/acts/ad-hu-369-97-overrunning-clutch-assembly/important-cases","documents":"/api/acts/ad-hu-369-97-overrunning-clutch-assembly/documents"}}