{"id":"F2006B06735","name":"AD/S-76/6 - Hydraulic Pumps - Replacement","slug":"ad-s-76-6-hydraulic-pumps-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114562,"registerId":"commonwealth-F2006B06735-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/S-76/6 - Hydraulic Pumps - Replacement","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-76/6 Hydraulic Pumps - Replacement 1/80\n\nApplicability: All model S-76 with S/Nos. SS No. 76005, 76006 and 760001 through 760043. Document:               Sikorsky CSB 76-29-1.\n\nCompliance: Within 100 hours time in service after 31 January 1980.\n\n \n\nBackground: The manufacturer advises of the need to replace certain models of hydraulic pumps.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive issued for a specific technical issue. It has not expanded beyond its original narrow scope of requiring hydraulic pump replacement on specific S-76 helicopters."},"complexity_factors":["Very short document (single page directive)","Only 3 defined applicability criteria (specific serial numbers)","Single compliance requirement with clear deadline","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No conditional logic or exceptions","Straightforward command structure: identify affected aircraft → specify action → set deadline"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders the replacement of certain hydraulic pumps on specific Sikorsky S-76 helicopters.\n\n**Who it affects:**\nOwners and operators of Sikorsky S-76 helicopters with serial numbers 76005, 76006, and 760001 through 760043.\n\n**Why it matters:**\nHydraulic pumps are critical for flight control systems in helicopters. The manufacturer (Sikorsky) identified a problem with certain pump models that could affect safety. This directive makes replacement compulsory to keep these aircraft airworthy (legally safe to fly).\n\n**Key requirements:**\n- **Deadline:** Must be done within 100 hours of flight time after 31 January 1980\n- **Reference document:** Sikorsky Customer Service Bulletin 76-29-1 (the technical instructions for the fix)\n\nThis is a historical directive from 1980, so it would only be relevant today for historical aircraft records or if specific helicopters were still operating under original certifications."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive, as written, is narrowly focused: it mandates replacement of certain hydraulic pumps on the listed S‑76 serial numbers and specifies the compliance deadline, referencing Sikorsky CSB 76-29-1 for procedural details. There is no indication in the text that the scope was broadened or narrowed from an earlier or different stated intent."},"complexity_factors":["Narrow applicability limited to specific serial numbers (Applicability)","Short and definite compliance window (100 hours TIS after 31 January 1980) increases scheduling pressure (Compliance)","Reliance on an external technical document (Sikorsky CSB 76-29-1) for procedural details (Document)","Technical work requires maintenance capability and parts procurement (implied by Replacement requirement and Document)","Directive text does not set out enforcement or exemption mechanics, leaving those details to regulatory practice (Compliance)"],"plain_english_summary":"Owners/operators of specified Sikorsky S‑76 helicopters must replace certain hydraulic pumps within 100 hours time‑in‑service after 31 January 1980, following Sikorsky CSB 76‑29‑1. The Civil Aviation Safety Authority issued the directive; affected serial numbers are listed. Operators are responsible for arranging the work, parts and associated downtime and costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-76-6-hydraulic-pumps-replacement","history":"/api/acts/ad-s-76-6-hydraulic-pumps-replacement/history","analysis":"/api/acts/ad-s-76-6-hydraulic-pumps-replacement/analysis","conflicts":"/api/acts/ad-s-76-6-hydraulic-pumps-replacement/conflicts","importantCases":"/api/acts/ad-s-76-6-hydraulic-pumps-replacement/important-cases","documents":"/api/acts/ad-s-76-6-hydraulic-pumps-replacement/documents"}}