{"id":"F2006B09598","name":"AD/ENST 28/8 - Fuselage Structure - Inspection","slug":"ad-enst-28-8-fuselage-structure-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54320,"registerId":"commonwealth-F2006B09598-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ENST 28/8 - Fuselage Structure - 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)  Enstrom F-28 Series Helicopters\n\n \n\nAD/ENST 28/8 Fuselage Structure - Inspection 10/73\n\nApplicability: All models.\n\n \n\nRequirement: Visually inspect for cracks the fuselage structure in the vicinity of the main rotor transmission assembly attachment.\n\n \n\nCompliance: Within 50 hours time in service after 17 October 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":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1567},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The instrument retains its original narrow technical scope as a targeted airworthiness inspection for a specific helicopter model without expansion into broader operational matters."},"complexity_factors":["Single operative sentence containing the entire requirement","No definitions, interpretation clauses, or technical appendices","Linear compliance schedule with fixed time intervals and no conditional exceptions","Total substantive text under 50 words"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA). ADs are legally binding instructions that aircraft owners must follow to fix unsafe conditions.\n\n**What it requires:** Owners of Enstrom F-28 series helicopters must visually check the fuselage structure near the main rotor transmission attachment point for cracks.\n\n**Who is affected:** Anyone operating or maintaining any model of Enstrom F-28 series helicopters.\n\n**When to comply:**\n*   **First check:** Within 50 hours of flight time after 17 October 1975\n*   **Repeat:** Every 100 hours of flight time thereafter"}},"importantCases":[],"_links":{"self":"/api/acts/ad-enst-28-8-fuselage-structure-inspection","history":"/api/acts/ad-enst-28-8-fuselage-structure-inspection/history","analysis":"/api/acts/ad-enst-28-8-fuselage-structure-inspection/analysis","conflicts":"/api/acts/ad-enst-28-8-fuselage-structure-inspection/conflicts","importantCases":"/api/acts/ad-enst-28-8-fuselage-structure-inspection/important-cases","documents":"/api/acts/ad-enst-28-8-fuselage-structure-inspection/documents"}}