{"id":"F2006B10677","name":"AD/HU 369/14 - Aft Fuselage Skin - Inspection","slug":"ad-hu-369-14-aft-fuselage-skin-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116618,"registerId":"commonwealth-F2006B10677-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HU 369/14 - Aft Fuselage Skin - 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 369/14 Aft Fuselage Skin - Inspection 4/75\n\nApplicability: All models: 369HE with S/Nos. 0101E to 0215E, 369HS with S/Nos. 0001S to 0661S, 369HM with S/Nos. 0001 to 0004, and 005M to 260M.\n\n \n\nDocument: Hughes SIN No. HN-82.\n\n \n\nCompliance: Within 100 hours time in service after 30 April 1975 and thereafter at intervals not exceeding 100 hours time in service.\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":3,"scope_assessment":{"changed":false,"description":"The provided text sets a clear, limited scope (specific models and serial-number ranges and a fixed inspection interval). There is no indication in the supplied instrument that the scope was altered from any earlier or original intent; the directive states applicability and compliance requirements without amendments or scope-expanding provisions in the text provided."},"complexity_factors":["Narrow applicability limited to specific aircraft models and precise serial-number ranges (requires verification of S/N).","Recurring compliance interval (every 100 hours TIS) creates ongoing scheduling and maintenance load.","Dependence on an external technical document (Hughes SIN No. HN-82) for procedural detail rather than including steps in the directive itself.","Clear and simple regulatory language with no layered conditions, exceptions, or multiple action paths."],"plain_english_summary":"This directive from the Civil Aviation Safety Authority requires operators of specified McDonnell Douglas (Hughes)/Kawasaki 369-series helicopters (listed serial ranges) to inspect the aft fuselage skin within 100 hours TIS after 30 April 1975 and thereafter every 100 hours, using procedures in Hughes SIN HN-82. It matters because it creates a recurring maintenance obligation with associated labour, downtime and repair costs for affected owners/operators."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1975 (as indicated by the '4/75' suffix). It has not expanded beyond its original purpose of addressing a specific structural inspection requirement for the aft fuselage skin of Hughes 369 helicopters. The scope remains tightly confined to the original safety issue it was designed to address."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 4 defined elements: applicability (3 model variants with serial number ranges), one referenced document, one compliance deadline, and one recurring interval","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998","Simple conditional logic: single trigger (100 hours time in service) with straightforward recurring obligation","No exceptions, exemptions, or nested conditions","Single-purpose instrument: one inspection task for one aircraft system on specific aircraft models"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It mandates a specific safety inspection for certain McDonnell Douglas (Hughes) and Kawasaki 369 series helicopters.\n\n**What it does:**\n- Requires operators to inspect the **aft (rear) fuselage skin** of affected helicopters\n- The inspection must happen within **100 hours of flight time** after 30 April 1975\n- After that first inspection, it must be repeated **every 100 hours of flight time**\n\n**Who it affects:**\n- Owners and operators of specific Hughes 369 helicopter models with particular serial numbers:\n  - 369HE (serial numbers 0101E to 0215E)\n  - 369HS (serial numbers 0001S to 0661S)  \n  - 369HM (serial numbers 0001-0004 and 005M-260M)\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. They typically issue when a manufacturer or regulator discovers a defect, wear pattern, or potential failure that could affect flight safety. This directive likely responds to a known issue with the rear fuselage skin that could compromise structural integrity. Non-compliance means the aircraft cannot legally fly in Australian airspace.\n\n**Key document reference:**\nThe directive points to **Hughes Service Information Notice (SIN) No. HN-82** — this is the manufacturer's technical document that presumably details exactly how to perform the inspection."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hu-369-14-aft-fuselage-skin-inspection","history":"/api/acts/ad-hu-369-14-aft-fuselage-skin-inspection/history","analysis":"/api/acts/ad-hu-369-14-aft-fuselage-skin-inspection/analysis","conflicts":"/api/acts/ad-hu-369-14-aft-fuselage-skin-inspection/conflicts","importantCases":"/api/acts/ad-hu-369-14-aft-fuselage-skin-inspection/important-cases","documents":"/api/acts/ad-hu-369-14-aft-fuselage-skin-inspection/documents"}}