{"id":"F2006B10723","name":"AD/HU 369/6 - NAS 1291 - 4 Nuts Used in Specific Applications Inspection","slug":"ad-hu-369-6-nas-1291-4-nuts-used-in-specific-applications-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116707,"registerId":"commonwealth-F2006B10723-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/6 - NAS 1291 - 4 Nuts Used in Specific Applications 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 369/6 NAS 1291 - 4 Nuts Used in Specific Applications Inspection\n\nApplicability: All models with S/Nos. as specified in Hughes SIN HN-4. Document:  Hughes SIN No. HN-4.\n\nCompliance: Before 1 September 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\n \n\n\n6/70\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1486},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow technical scope, limited solely to the inspection of NAS 1291-4 nuts on specified helicopter models as identified in the referenced manufacturer service notice."},"complexity_factors":["Extremely brief text with minimal provisions","Single external cross-reference to Hughes Service Information Notice HN-4 for technical details and serial number applicability","No defined terms or interpretation section","Single absolute compliance deadline with no conditional exceptions","No nested logic or alternative compliance pathways"],"plain_english_summary":"**What it is:** This is an Airworthiness Directive (AD) — a legally binding safety order issued under the Civil Aviation Regulations requiring specific maintenance action on aircraft.\n\n**What it requires:** Owners and operators must inspect specific nuts (identified as **NAS 1291 - 4**) used in critical applications on their helicopters. The exact details of which aircraft and which nuts are covered appear in a separate technical document called Hughes Service Information Notice HN-4.\n\n**Who it affects:** Operators of McDonnell Douglas (Hughes) and Kawasaki 369 series helicopters with specific serial numbers listed in the referenced notice.\n\n**The deadline:** The inspection had to be completed before **1 September 1971**.\n\n**Why it matters:** This directive addresses potential safety risks with specific fasteners in critical applications, ensuring they are inspected to prevent mechanical failures that could compromise flight safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-6-nas-1291-4-nuts-used-in-specific-applications-inspection","history":"/api/acts/ad-hu-369-6-nas-1291-4-nuts-used-in-specific-applications-inspection/history","analysis":"/api/acts/ad-hu-369-6-nas-1291-4-nuts-used-in-specific-applications-inspection/analysis","conflicts":"/api/acts/ad-hu-369-6-nas-1291-4-nuts-used-in-specific-applications-inspection/conflicts","importantCases":"/api/acts/ad-hu-369-6-nas-1291-4-nuts-used-in-specific-applications-inspection/important-cases","documents":"/api/acts/ad-hu-369-6-nas-1291-4-nuts-used-in-specific-applications-inspection/documents"}}