{"id":"F2006B10712","name":"AD/HU 369/5 - Main Rotor Blade - Inspection","slug":"ad-hu-369-5-main-rotor-blade-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116687,"registerId":"commonwealth-F2006B10712-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/5 - Main Rotor Blade - 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 369/5 Main Rotor Blade - Inspection 6/70\n\nApplicability: All models fitted with main rotor blades P/N 369A1100-501 with S/Nos. as listed in Hughes SIN No./ HN-8.\n\n \n\nDocument: Hughes SIN No. HN-8. Compliance: 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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive’s scope is stated within the text: it applies to main rotor blades P/N 369A1100-501 with the serial numbers listed in Hughes SIN No. HN-8 and requires inspection before 1 September 1971 (Applicability; Document; Compliance). There is no information in the provided text indicating any change from an earlier or original scope; the requirement as written is narrow and limited to the parts and serial numbers specified."},"complexity_factors":["Very short, narrowly targeted directive specifying a single part number and an external serial-number list (Applicability; Document).","Fixed compliance deadline specified plainly (Compliance), reducing procedural complexity but creating scheduling pressure.","Dependence on an external document (Hughes SIN No. HN-8) for the precise serial numbers increases operational steps to confirm applicability.","No technical inspection procedure or remedial actions are included in the text; implementers must rely on separate maintenance guidance or the manufacturer’s SIN, creating an external dependency.","Limited discretionary content in the directive itself (it is prescriptive), so legal interpretation complexity is low."],"plain_english_summary":"The Civil Aviation Safety Authority mandates inspection of main rotor blades P/N 369A1100-501 where serial numbers match Hughes Service Information Notice No. HN-8. Owners/operators of McDonnell Douglas (Hughes) and Kawasaki 369 series helicopters with those blades must arrange the inspection.\n\nThis is a time‑bound safety requirement (inspection required before 1 September 1971) that shifts inspection cost and responsibility onto affected operators and their maintenance providers."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on main rotor blade inspection for one helicopter series. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","Only 2 defined references (part number 369A1100-501 and document reference Hughes SIN No. HN-8)","No conditional logic or nested exceptions","Single compliance requirement with fixed deadline","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Straightforward applicability clause using simple 'all models fitted with' language"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\n- Requires owners and operators of specific McDonnell Douglas (formerly Hughes) and Kawasaki 369 series helicopters to inspect their main rotor blades.\n- The inspection applies only to blades with part number **369A1100-501** and specific serial numbers listed in a Hughes Service Information Notice (SIN) numbered HN-8.\n\n**Who it affects:**\n- Anyone operating these particular helicopter models with the affected rotor blades.\n\n**Why it matters:**\n- Main rotor blades are critical safety components. This directive was issued to prevent potential failures that could lead to catastrophic accidents. The compliance deadline was set for **before 1 September 1971**, indicating this was an urgent safety measure addressing a known defect or wear pattern in these specific blades.\n\n**Key point:** This is a historical directive from 1970 (indicated by \"6/70\" in the reference), meaning it applied to aviation operations over 50 years ago. Modern operators would need to check current AD status, but this document shows how CASA enforces mandatory safety actions through legally binding directives."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-5-main-rotor-blade-inspection","history":"/api/acts/ad-hu-369-5-main-rotor-blade-inspection/history","analysis":"/api/acts/ad-hu-369-5-main-rotor-blade-inspection/analysis","conflicts":"/api/acts/ad-hu-369-5-main-rotor-blade-inspection/conflicts","importantCases":"/api/acts/ad-hu-369-5-main-rotor-blade-inspection/important-cases","documents":"/api/acts/ad-hu-369-5-main-rotor-blade-inspection/documents"}}