{"id":"F2006B10682","name":"AD/HU 369/19 - Fibreglass Tail Rotor Blades - Inspection","slug":"ad-hu-369-19-fibreglass-tail-rotor-blades-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116628,"registerId":"commonwealth-F2006B10682-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/19 - Fibreglass Tail Rotor Blades - 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 369/19 Fibreglass Tail Rotor Blades - Inspection 10/75\n\nApplicability: All 369 series fitted with fibreglass tail rotor blades P/Nos. 369A1710, 369A1710-9, 369A1710-11, 369-6120, 369A1607 and 369C SK22.\n\n \n\nDocument: Hughes SIN Co. HN-88. Compliance:  As detailed in requirement document.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This appears to be a standard, narrow Airworthiness Directive as originally intended. ADs are designed to address specific safety issues with specific aircraft components. This document maintains that focused scope — it targets one helicopter series, one component type (fibreglass tail rotor blades), and specific part numbers. There is no evidence of scope creep or expansion beyond the original safety purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section — relies on standard aviation terminology","Single, clear applicability clause","No nested conditions or exceptions","Simple cross-reference to external technical document (Hughes SIN HN-88) rather than internal legislative cross-referencing","No conditional logic or 'if-then' structures within the directive itself"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA).\n\n**What it does:**\nIt requires owners and operators of specific McDonnell Douglas (Hughes) and Kawasaki 369 series helicopters to inspect their **fibreglass tail rotor blades**. The blades covered are those with specific part numbers: 369A1710, 369A1710-9, 369A1710-11, 369-6120, 369A1607, and 369C SK22.\n\n**Who it affects:**\nAnyone who owns, operates, or maintains a Hughes/Kawasaki 369 series helicopter fitted with these particular fibreglass tail rotor blades.\n\n**Why it matters:**\nTail rotor blades are critical for helicopter control and safety. This directive likely addresses a discovered defect, wear pattern, or potential failure mode in these specific blades. The reference to \"HN-88\" suggests this follows a manufacturer service bulletin identifying a safety issue.\n\n**What must be done:**\nOperators must follow the inspection procedures detailed in Hughes Service Information Notice (SIN) HN-88. The directive itself doesn't spell out the exact steps — it simply makes compliance with that manufacturer document legally mandatory under Australian aviation law."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Based on the text provided, the AD applies to all 369 series helicopters fitted with the listed fibreglass tail rotor blade part numbers and requires compliance with Hughes SIN Co. HN-88. The instrument neither indicates a change in this scope relative to any earlier instrument nor provides information showing the scope has been altered; no prior version or differing scope is included in the supplied text."},"complexity_factors":["Relies on an external technical document (Hughes SIN Co. HN-88) for all inspection procedures and intervals (Document line).","Applicability is narrowly defined by specific part numbers and a specific helicopter series, requiring parts-level checking by operators (Applicability line).","AD text excerpt does not include compliance timings, reporting requirements or remedial action detail, creating dependence on the referenced document for operational planning (Document line).","Legal enforcement is straightforward (CASA/Part 39), but practical compliance requires access to technical documents and possibly specialised maintenance skills (header; Document)."],"plain_english_summary":"This AD mandates inspections of specified fibreglass tail-rotor blades on McDonnell Douglas (Hughes) and Kawasaki 369-series helicopters by making Hughes SIN Co. HN-88’s inspection requirements compulsory. It affects owners/operators of helicopters fitted with the listed part numbers.\n\nCASA enforces the AD under Part 39; operators must obtain HN-88, arrange and pay for inspections and any remedial work. The AD itself defers technical detail and timing to HN-88."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-19-fibreglass-tail-rotor-blades-inspection","history":"/api/acts/ad-hu-369-19-fibreglass-tail-rotor-blades-inspection/history","analysis":"/api/acts/ad-hu-369-19-fibreglass-tail-rotor-blades-inspection/analysis","conflicts":"/api/acts/ad-hu-369-19-fibreglass-tail-rotor-blades-inspection/conflicts","importantCases":"/api/acts/ad-hu-369-19-fibreglass-tail-rotor-blades-inspection/important-cases","documents":"/api/acts/ad-hu-369-19-fibreglass-tail-rotor-blades-inspection/documents"}}