{"id":"F2006B10681","name":"AD/HU 369/18 - Engine Air Filter By-Pass Door - Inspection","slug":"ad-hu-369-18-engine-air-filter-by-pass-door-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116626,"registerId":"commonwealth-F2006B10681-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/18 - Engine Air Filter By-Pass Door - Inspection","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 369/18 Engine Air Filter By-Pass Door - Inspection 6/75\n\nApplicability: All models: 369HE with S/Nos. 0101E to 0215E. 369HS with S/Nos. 0001, 0002, 0101S to 0711S. 369HM with S/Nos. 0001 to 0004, 0005 M to 0270M.\n\n \n\nDocument: Hughes SIN No. HN-84.\n\n \n\nCompliance: For Part 1 - Within 50 hours time in service after 21 May 1975 and thereafter at intervals not exceeding 100 hours time in service until modified in accordance with requirement document Part 2.\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":1785},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow technical scope. It addresses a specific mechanical defect in specific helicopter models and has not expanded to cover additional aircraft types or broader operational requirements beyond the original air filter by-pass door inspection mandate."},"complexity_factors":["Narrow, technical scope applying only to specific aircraft serial numbers","Reliance on external technical document (Hughes SIN HN-84) for complete compliance instructions","Requires calculation of 'time in service' (flight hours) for compliance scheduling","No nested definitions or conditional exceptions — straightforward command structure"],"plain_english_summary":"This AD orders operators of certain Hughes/Kawasaki 369-series helicopters (specific serial-numbered airframes) to inspect the engine air‑filter by‑pass door — the backup that opens if the main filter clogs. Regular inspections are required to prevent the door sticking, which could let debris into or starve the engine of air and cause in‑flight engine damage or failure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-18-engine-air-filter-by-pass-door-inspection","history":"/api/acts/ad-hu-369-18-engine-air-filter-by-pass-door-inspection/history","analysis":"/api/acts/ad-hu-369-18-engine-air-filter-by-pass-door-inspection/analysis","conflicts":"/api/acts/ad-hu-369-18-engine-air-filter-by-pass-door-inspection/conflicts","importantCases":"/api/acts/ad-hu-369-18-engine-air-filter-by-pass-door-inspection/important-cases","documents":"/api/acts/ad-hu-369-18-engine-air-filter-by-pass-door-inspection/documents"}}