{"id":"F2006B06726","name":"AD/S-76/47 - Engine and Engine Compartment Drain Lines","slug":"ad-s-76-47-engine-and-engine-compartment-drain-lines","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114551,"registerId":"commonwealth-F2006B06726-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/S-76/47 - Engine and Engine Compartment Drain Lines","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-76/47 Engine and Engine Compartment Drain Lines 9/87\n\nApplicability: All model S76A helicopters.\n\nRequirement: Action in accordance with Sikorsky Alert Service Bulletin No. 76-71-9. Compliance:  Within 100 hours time in service after 31 August 1987, inspect in accordance with\n\nSection 2 Para A of Requirement document.\n\n \n\nBackground: Some sections of the combustion chamber and exhaust casing lower drain lines have cracked after extended periods of 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","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1723},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow technical scope from 1987. It addresses only the specific safety issue of cracked drain lines in S-76A helicopters and has not expanded to cover additional aircraft models, components, or operational requirements beyond the original technical remedy."},"complexity_factors":["Extremely narrow applicability (single helicopter model: S-76A)","Single, specific action required (inspection per one defined technical standard)","Clear, unambiguous compliance deadline (100 hours time in service)","No exceptions, exemptions, or conditional provisions","Short length with minimal cross-referencing (only one external document cited)"],"plain_english_summary":"This is a **safety directive** (called an Airworthiness Directive) issued to prevent mechanical failures in helicopters.\n\n**What it does:**\n- Requires owners and operators of Sikorsky S-76A helicopters to inspect specific drain lines located in the engine and engine compartment\n- The inspection must follow the exact procedure outlined in the manufacturer's technical notice: *Sikorsky Alert Service Bulletin No. 76-71-9* (a formal safety alert issued by the helicopter maker)\n- Must be completed within **100 hours of flying time** after 31 August 1987\n\n**Why it matters:**\nThe combustion chamber and exhaust casing drain lines were found to develop cracks after extended use. These cracks could potentially cause dangerous failures, so this directive mandates proactive checks to catch damage before it creates a safety risk.\n\n**Who is affected:**\nAnyone operating an S-76A helicopter in Australia must comply with this inspection requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-76-47-engine-and-engine-compartment-drain-lines","history":"/api/acts/ad-s-76-47-engine-and-engine-compartment-drain-lines/history","analysis":"/api/acts/ad-s-76-47-engine-and-engine-compartment-drain-lines/analysis","conflicts":"/api/acts/ad-s-76-47-engine-and-engine-compartment-drain-lines/conflicts","importantCases":"/api/acts/ad-s-76-47-engine-and-engine-compartment-drain-lines/important-cases","documents":"/api/acts/ad-s-76-47-engine-and-engine-compartment-drain-lines/documents"}}