{"id":"F2006B06696","name":"AD/S-76/12 - Upper Deck Flight Controls Installation - Modification","slug":"ad-s-76-12-upper-deck-flight-controls-installation-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114501,"registerId":"commonwealth-F2006B06696-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/S-76/12 - Upper Deck Flight Controls Installation - Modification","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-76/12 Upper Deck Flight Controls Installation - Modification\n\n\n7/80\n\n \n\nApplicability: All models S76 with S/Nos. 76003 and 76005, 760001 to 760006, 760009 and\n\n760011 to 760015.\n\n \n\nDocument: Sikorsky CSB 76-67-1.\n\n \n\nCompliance: Within 100 hours time in service after 31 July 1980.\n\n \n\nBackground: Rework of a bracket and angle is necessary to increase the clearances for rigging pin installation and roll gradient spring cylinder operation.\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":2,"scope_assessment":{"changed":false,"description":"The AD's scope is confined to the listed S-76 serial numbers and prescribes a single modification method referenced to Sikorsky CSB 76-67-1 with a single compliance deadline. There is no indication in the text that the scope was broadened or altered from the directive's stated measures (Applicability; Document; Compliance; Background)."},"complexity_factors":["Narrow applicability limited to a specific set of serial numbers (Applicability).","Single, well-defined technical action: rework of a bracket and an angle to increase clearances (Background).","Compliance tied to a single deadline: within 100 hours time in service after 31 July 1980 (Compliance).","Mandatory reference to a single manufacturer's document for the technical procedure (Sikorsky CSB 76-67-1) which operators must follow (Document).","Operational considerations (scheduling, downtime, maintenance resource use) created by the fixed compliance window (Compliance)."],"plain_english_summary":"### What this directive requires\n\nThis Airworthiness Directive (AD) requires a specific modification to the upper-deck flight control installation on a limited set of Sikorsky S-76 helicopters. The work called for is a rework of a bracket and an angle to increase clearances for rigging pin installation and for the roll gradient spring cylinder to operate correctly (Background).\n\n### Who it affects\n\nIt applies only to S-76 helicopters with the serial numbers listed in the AD: 76003 and 76005, 760001 to 760006, 760009, and 760011 to 760015 (Applicability). The operator or owner of each affected helicopter is responsible for arranging compliance (Applicability; Compliance).\n\n### What must be done and by when\n\nOperators must carry out the modification described in Sikorsky CSB 76-67-1 (Document). The work must be completed within 100 hours time in service after 31 July 1980 (Compliance).\n\n### How it works mechanically\n\n- The AD points to the manufacturer's service communication (Sikorsky CSB 76-67-1) as the technical document to be followed for the rework (Document). \n- The stated technical purpose is to increase clearances that affect rigging pin installation and roll gradient spring cylinder operation (Background).\n\n### Who decides and who pays\n\n- The directive is issued under the Commonwealth civil aviation regulatory framework and is part of the Civil Aviation Safety Authority's Schedule of Airworthiness Directives (header). \n- Practically, the operator/owner of each affected helicopter must decide when and how to schedule the work and will need to arrange the maintenance to meet the deadline (Applicability; Compliance). The AD itself does not state how costs are allocated; responsibility for compliance typically rests with the owner/operator as the person controlling the aircraft (Applicability; Compliance).\n\n### Compliance burden and implementation notes\n\n- The requirement is narrowly scoped to specific serial numbers, so only a small subset of S-76 operators are affected (Applicability). \n- Compliance requires following the Sikorsky CSB referenced in the AD, which concentrates the technical method in the manufacturer's document (Document). \n- The fixed 100-hour time-in-service window from 31 July 1980 creates a scheduling requirement that may impose aircraft downtime and use of maintenance resources (Compliance). \n\n### Purpose claim and trade-offs\n\n- The AD explicitly states the purpose as increasing clearances for rigging pin installation and roll gradient spring cylinder operation (Background). \n- The concrete trade-off is between the intended technical change (the rework) and the operational cost of performing that work within the prescribed timeframe and by the method referenced in the manufacturer's document (Compliance; Document). The AD sets the technical solution and the deadline, leaving owners/operators to absorb the scheduling and maintenance burden.\n\n(Sections cited: Applicability; Document; Compliance; Background.)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-purpose airworthiness directive from 1980 addressing a specific mechanical modification. It has not expanded beyond its original scope; it remains a narrow safety order for a specific aircraft type and manufacturing batch."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 operative sections: Applicability, Document, Compliance, and Background","No defined terms section","No cross-references to other legislation or regulations","Single, unambiguous compliance action with clear deadline","Limited applicability (specific serial numbers listed explicitly)","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders owners and operators of specific Sikorsky S-76 helicopters to modify the upper deck flight controls. Specifically, they must rework a bracket and angle to create more clearance for two things: installing rigging pins (tools used to adjust control cables) and allowing the roll gradient spring cylinder to operate properly.\n\n**Who it affects:**\nOwners and operators of Sikorsky S-76 helicopters with specific serial numbers: 76003, 76005, 760001 through 760006, 760009, and 760011 through 760015.\n\n**Why it matters:**\nWithout this modification, there may be insufficient clearance in the flight control system. This could interfere with proper rigging of the controls or impede the roll gradient spring cylinder — both critical for safe helicopter handling and control. The directive makes the fix mandatory and sets a deadline: complete it within 100 hours of flight time after 31 July 1980.\n\n**Key details:**\n- **Compliance deadline:** Within 100 hours \"time in service\" after 31 July 1980\n- **Technical reference:** Sikorsky CSB 76-67-1 (the manufacturer's service bulletin with instructions)\n- **Nature of work:** Physical modification/rework of hardware, not an inspection"}},"importantCases":[],"_links":{"self":"/api/acts/ad-s-76-12-upper-deck-flight-controls-installation-modification","history":"/api/acts/ad-s-76-12-upper-deck-flight-controls-installation-modification/history","analysis":"/api/acts/ad-s-76-12-upper-deck-flight-controls-installation-modification/analysis","conflicts":"/api/acts/ad-s-76-12-upper-deck-flight-controls-installation-modification/conflicts","importantCases":"/api/acts/ad-s-76-12-upper-deck-flight-controls-installation-modification/important-cases","documents":"/api/acts/ad-s-76-12-upper-deck-flight-controls-installation-modification/documents"}}