{"id":"F2006B10751","name":"AD/HU 369/87 - Fuel Vent System","slug":"ad-hu-369-87-fuel-vent-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116763,"registerId":"commonwealth-F2006B10751-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/87 - Fuel Vent System","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 369/87 Fuel Vent System 2/94\n\nApplicability: Model 369D, 369E S/N 0001E through 0508E, 369F S/N 0003 through 0091, 369FF S/N 0003 through 0091 and 369H series helicopters equipped with fuel vent line emergency shut-off valve assemblies P/N 369H8108, 369H8108-501 or 369H8108- 503.\n\n \n\nRequirement: Action in accordance with McDonnell Douglas SIN HN-234.1, DN-181.1, EN-73.12 or FN-60.1, as applicable.\n\n \n\nNote: FAA AD 93-18-05 Amdt 39-8690 refers.\n\n \n\nCompliance: As specified in the Requirement Document.\n\n \n\nBackground: The manufacturer has advised that it is possible for the emergency shutoff valve to obstruct the aircraft fuel vent line resulting in erroneous fuel level indications.\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 a discrete, targeted safety directive addressing a specific mechanical defect in specific helicopter models. It has not expanded beyond its original purpose of mandating a fuel vent system fix."},"complexity_factors":["Very short document (approximately 200 words)","Only 3 defined part numbers and specific serial number ranges","Single technical requirement referencing external manufacturer documents","No nested conditions or exceptions","No cross-references to other legislation beyond a single FAA reference note","Straightforward applicability test (model + serial number + part number)"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and repair of the fuel vent system on certain McDonnell Douglas/Kawasaki 369 series helicopters because an emergency shut-off valve can block the vent and give false fuel readings. It applies to affected 369D/E/F/FF/H helicopters fitted with shut-off valves P/N 369H8108, -501, or -503.\n\nCompliance with the manufacturer’s service instructions is required to prevent fuel starvation and ensure legal airworthiness."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD's scope is confined to the listed 369-series models, serial number ranges and specified emergency shut-off valve part numbers; it directs operators to follow manufacturer service instructions (Applicability; Requirement; Compliance). The document itself contains no indication the scope has been broadened or narrowed from its stated applicability."},"complexity_factors":["Narrow technical applicability tied to specific models, serial number ranges and particular part numbers, requiring operators to identify affected airframes and components (Applicability).","Mandates compliance by reference to multiple manufacturer service information notices (SIN HN-234.1, DN-181.1, EN-73.12, FN-60.1), so the precise work scope is in external documents rather than the AD text (Requirement).","Compliance timing and detailed procedures are deferred to the Requirement Document, adding implementation and scheduling uncertainty for operators (Compliance).","Cross-reference to an FAA AD (Note) creates potential for differing international guidance or updates that operators must monitor (Note).","Operational and cost burden falls on owners/operators and maintenance organisations to inspect, modify or replace parts and to track serial numbers and part-numbered assemblies (Applicability; Background).","Regulatory discretion and enforcement depend on interpreting external service instructions and their applicability to individual helicopters (Requirement; Compliance)."],"plain_english_summary":"**Airworthiness directive** requiring operators of specified McDonnell Douglas (Hughes) and Kawasaki 369-series helicopters (limited by model, serial number range and specified fuel-vent valve part numbers) to carry out the corrective actions set out in the manufacturer's service instructions to prevent fuel-vent line obstruction that can cause false fuel-level readings. Operators and their maintenance organisations must fund and perform the inspections/repairs; the regulator enforces compliance (see Requirement, Compliance, Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-87-fuel-vent-system","history":"/api/acts/ad-hu-369-87-fuel-vent-system/history","analysis":"/api/acts/ad-hu-369-87-fuel-vent-system/analysis","conflicts":"/api/acts/ad-hu-369-87-fuel-vent-system/conflicts","importantCases":"/api/acts/ad-hu-369-87-fuel-vent-system/important-cases","documents":"/api/acts/ad-hu-369-87-fuel-vent-system/documents"}}