{"id":"F2006B10734","name":"AD/HU 369/7 Amdt 1 - Oil Cooler Blow System - Modification","slug":"ad-hu-369-7-amdt-1-oil-cooler-blow-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116729,"registerId":"commonwealth-F2006B10734-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/7 Amdt 1 - Oil Cooler Blow System - Modification","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 369/7\n\nAmdt 1\n\n\nOil Cooler Blow System - Modification 10/71\n\n \n\nApplicability: Model 369HE with S/Nos. 0101E to 0215E and Model 369HE with S/Nos. 0101S to 0257S, 0260S, 0261S and 0287S.\n\n \n\nDocument: Hughes SIN HN-28.1 Part 1.\n\n \n\nCompliance: Within 100 hours time in service after 29 October 1971.\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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1671},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original narrow scope of the airworthiness directive, which addresses a specific mechanical defect in the oil cooler blow system of defined helicopter models. The directive remains tightly focused on a single safety-critical modification without expansion into unrelated systems or aircraft types."},"complexity_factors":["Single, specific technical requirement with no exceptions","Applicability limited to enumerated aircraft serial numbers only","Straightforward compliance calculation (100 hours time-in-service)","No cross-references to other legislation or conditional provisions","Document is approximately 150 words in length"],"plain_english_summary":"**What this does:** This is a safety directive (called an Airworthiness Directive) that requires owners and operators of specific Hughes 369HE helicopters to modify the oil cooler blow system to prevent engine damage or failure.\n\n**Who it affects:** Owners and operators of Model 369HE helicopters with specific serial numbers:\n- S/Nos. 0101E to 0215E\n- S/Nos. 0101S to 0257S, plus individual aircraft 0260S, 0261S and 0287S\n\n**What must be done:** The helicopters must be modified according to the technical instructions in **Hughes Service Information Notice HN-28.1 Part 1**.\n\n**When:** The modification must be completed within 100 hours of flight time (measured from when the helicopter is in service) after 29 October 1971.\n\n**Why it matters:** This fixes a design flaw in the oil cooling system that could lead to engine failure, loss of oil pressure, or forced landings if not addressed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-7-amdt-1-oil-cooler-blow-system-modification","history":"/api/acts/ad-hu-369-7-amdt-1-oil-cooler-blow-system-modification/history","analysis":"/api/acts/ad-hu-369-7-amdt-1-oil-cooler-blow-system-modification/analysis","conflicts":"/api/acts/ad-hu-369-7-amdt-1-oil-cooler-blow-system-modification/conflicts","importantCases":"/api/acts/ad-hu-369-7-amdt-1-oil-cooler-blow-system-modification/important-cases","documents":"/api/acts/ad-hu-369-7-amdt-1-oil-cooler-blow-system-modification/documents"}}