{"id":"F2006B10709","name":"AD/HU 369/47 Amdt 2 - Over-Running Clutch - Sprag Assembly","slug":"ad-hu-369-47-amdt-2-over-running-clutch-sprag-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116681,"registerId":"commonwealth-F2006B10709-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/47 Amdt 2 - Over-Running Clutch - Sprag Assembly","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\nAD/HU 369/47\n\nAmdt 2\n\n\nOver-Running Clutch - Sprag Assembly 1/86\n\n \n\nApplicability: All models of 369D, E, F and H series aircraft equipped with any cargo hook. Requirement:               Hughes Service Information Notice DN 81-1 EN-3, HN 164-1 and FN-3.\n\nCompliance: Inspection - Within 600 hours total time in service, unless already accomplished, and then at periods not exceeding 300 hours time in service.\n\n \n\nRetirement: Prior to the assembly exceeding 1800 hours time in service.\n\n \n\nBackground: This Directive is amended to include the E series aircraft and its Requirement Documents.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 2 to an existing Airworthiness Directive. The amendment explicitly states it is limited to expanding coverage to the E series aircraft and updating the referenced technical documents. This represents a modest, incremental expansion consistent with the original safety purpose — it does not represent scope creep beyond the original intent of ensuring sprag assembly airworthiness in this helicopter family."},"complexity_factors":["Single, specific mechanical component targeted (over-running clutch sprag assembly)","Clear, numerical compliance thresholds (600 hours, 300 hours, 1800 hours)","Minimal defined terms (only standard aviation terminology like 'time in service')","No nested exceptions or conditional logic","Short document length (approximately 150 words of substantive content)","Simple applicability test (aircraft model + cargo hook presence)","Single amendment purpose stated explicitly (adding E series and updating requirement documents)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it like a compulsory recall notice, but for aircraft parts.\n\n**What it does:** It requires owners and operators of specific Hughes/Kawasaki helicopters (the 369D, E, F, and H series) to inspect a critical component called the **over-running clutch sprag assembly** — a mechanical part that allows the rotor to keep spinning if the engine fails (essential for autorotation and emergency landings).\n\n**Who it affects:** Anyone operating these helicopter models that are equipped with cargo hooks (used for lifting external loads).\n\n**The requirements:**\n- **First inspection:** Must be done within 600 hours of flight time, unless already completed\n- **Ongoing checks:** Every 300 hours of flight time thereafter\n- **Replacement deadline:** The entire assembly must be retired (permanently removed from service) before it reaches 1,800 total flight hours\n\n**Why it matters:** This amendment expands the safety requirement to include the \"E series\" aircraft and updates the technical documents operators must follow. The sprag assembly is a life-critical component — if it fails, the helicopter could lose the ability to autorotate, making engine failure potentially catastrophic."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment expands the directive's applicability to include the 369E series and includes its Requirement Documents. The Background states the Directive is amended to include the E series aircraft and its Requirement Documents, which alters the population of affected aircraft. (Background; Applicability; Requirement)"},"complexity_factors":["Narrow technical scope (only the over‑running clutch sprag assembly for specified 369 models with cargo hooks). (Applicability)","Clear, fixed compliance timings (initial 600 hours, repeat intervals not exceeding 300 hours, retirement before 1,800 hours). (Compliance; Retirement)","Dependence on external technical documents (Hughes Service Information Notices DN 81-1 EN-3, HN 164-1 and FN-3) for procedural detail. (Requirement)","Limited discretion in the AD text — prescriptive measures reduce legal ambiguity but require operators to follow exact intervals and retirement limits. (Compliance; Retirement)","Amendment element (addition of E series) changes scope but does not add procedural complexity. (Background)"],"plain_english_summary":"Operators of McDonnell Douglas (Hughes) and Kawasaki 369D/E/F/H helicopters fitted with cargo hooks must inspect the over‑running clutch sprag assembly per specified Hughes service notices, with an initial check within 600 hours TIS (if not already done) and recurring inspections no more than every 300 hours. The assembly must be retired before 1,800 hours TIS. The amendment explicitly adds the E series and its service documents, shifting inspection and replacement costs to operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-47-amdt-2-over-running-clutch-sprag-assembly","history":"/api/acts/ad-hu-369-47-amdt-2-over-running-clutch-sprag-assembly/history","analysis":"/api/acts/ad-hu-369-47-amdt-2-over-running-clutch-sprag-assembly/analysis","conflicts":"/api/acts/ad-hu-369-47-amdt-2-over-running-clutch-sprag-assembly/conflicts","importantCases":"/api/acts/ad-hu-369-47-amdt-2-over-running-clutch-sprag-assembly/important-cases","documents":"/api/acts/ad-hu-369-47-amdt-2-over-running-clutch-sprag-assembly/documents"}}