{"id":"F2006B06723","name":"AD/S-76/42 - Upper Fuselage, Station 300","slug":"ad-s-76-42-upper-fuselage-station-300","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114546,"registerId":"commonwealth-F2006B06723-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/S-76/42 - Upper Fuselage, Station 300","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)  Sikorsky S-76 Series Helicopters\n\n \n\nAD/S-76/42 Upper Fuselage, Station 300 8/86\n\nApplicability: All model S-76A, S/Nos. 76003 to 76007, 760001 to 760338.\n\n \n\nRequirement: Inspect and reinforce the upper fuselage at Station 300 in accordance with Sikorsky Alert Service Bulletin No. 76-53-27.\n\n \n\nCompliance: Within 500 hours time in service after 31 August 1986.\n\n \n\nBackground: A stainless steel strap reinforcement is required to help prevent fatigue cracking.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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":2585},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope as a targeted safety intervention for a specific structural defect in defined helicopter models. It has not expanded beyond its initial technical remit."},"complexity_factors":["Single, specific technical requirement with clear applicability criteria","Reference to external manufacturer technical document (Sikorsky Alert Service Bulletin)","Limited to specific aircraft serial number ranges","Technical aviation terminology requiring specialized knowledge (Station 300, time in service)"],"plain_english_summary":"**What this does**\nThis Airworthiness Directive mandates a safety fix for specific Sikorsky S-76A helicopters to prevent dangerous structural cracks in the fuselage.\n\n**Who is affected**\nOwners and operators of Sikorsky S-76A helicopters with serial numbers 76003 to 76007, and 760001 to 760338.\n\n**What must be done**\nYou must inspect and reinforce the upper fuselage at \"Station 300\" (a specific structural frame location) following the manufacturer's instructions in *Sikorsky Alert Service Bulletin No. 76-53-27*. This involves installing a stainless steel strap to strengthen the structure against fatigue.\n\n**Why this matters**\nWithout this reinforcement, the helicopter's fuselage could develop fatigue cracks—tiny fractures caused by repeated flight stress—that could compromise the aircraft's structural integrity and safety.\n\n**When you must comply**\nThe work must be completed within 500 hours of flight time (\"time in service\") after 31 August 1986."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-76-42-upper-fuselage-station-300","history":"/api/acts/ad-s-76-42-upper-fuselage-station-300/history","analysis":"/api/acts/ad-s-76-42-upper-fuselage-station-300/analysis","conflicts":"/api/acts/ad-s-76-42-upper-fuselage-station-300/conflicts","importantCases":"/api/acts/ad-s-76-42-upper-fuselage-station-300/important-cases","documents":"/api/acts/ad-s-76-42-upper-fuselage-station-300/documents"}}