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The Sikorsky S-76 is a medium-size commercial utility helicopter designed and produced by the American helicopter manufacturer Sikorsky Aircraft. It is the company's first helicopter specifically developed for the civilian market.
The Sikorsky S-76® is an intermediate class twin engine commercial helicopter powered by two turboshaft engines, which drive both the main and tail rotors, each with four blades. The S-76 landing gear is retractable.
The enhanced S-76 C++ helicopter builds on the proven legacy of over 600 S-76 helicopters delivered with two uprated, dual-FADEC-controlled Turbomeca Arriel 2S2 engines and a full-coverage inlet barrier filter. The basic cockpit features a four-axis, fully coupled autopi-lot, Integrated Instrument Display System (IIDS), Honeywell
Decreasing sales volume, high supply and production costs plus those associated with adapting the S76 range to meet rising safety requirements heralded the end of S76 production and Sikorsky terminating activity in the civilian market, although S76 spare part support would continue.
The S-76 helicopter’s strengths include low internal acoustic levels and a smooth ride. Sikorsky’s active vibration control and Quiet Zone ™ transmission
The S-76 Mark II was powered by twin Allison 250-230S turboshaft engines with a maximum continuous rating 485 kW (557 HP) each. The original S-76A used 5% less powerful Allisons. The transmission system was rated at 969 kW (1,300 HP) and could absorb the full power of both engines.
• Dual-input main transmission rated at 1,605 shp for takeoff • intermediate and tail gearboxes with interconnecting drive shafts • magnetic chip connectors with fuzz burn capability on gearboxes
