modified to S-76A+, A++, C, and C+. 284 manufactured. S-76A Utility Utility transport version, equipped with sliding doors and a strengthened floor. S-76A+ Unsold S-76s were fitted with two Turbomeca Arriel 1S turboshaft engines. 17 manufactured. S-76 helicopters fitted with two Turbomeca Arriel 1S1 turboshaft engines. S-76A Mk II Improved all-weather transport version, fitted with more powerful engines, and other detail improvements. Powered by two Pratt & Whitney Canada PT6B-36A or Pratt & Whitney Canada PT6B-36B turboshaft engines. 101 built. Powered by two 539-kW (981-shp) Turbomeca Arriel 1S1 turboshaft engines. 43 manufactured. Uprated version, fitted with improved Turbomeca Arriel 2S1 turboshafts with FADEC. 35 manufactured. S-76C++ Turbomeca Arriel 2S2 Powered by two Pratt & Whitney Canada PW210S. Also features a Thales Topdeck avionics suite and improved noise signature over all previous variants. Military AUH-76 Armed utility transport version, developed from the S-76 Mk. II. H-76 Eagle A militarised variant suitable for naval operations, based on the S-76B, it was announced during 1985 but none were ever sold. Experimental derivatives Sikorsky S-75 The Advanced Composite Airframe Program (ACAP) was an all-composite Sikorsky early LHX proof of concept aircraft. Designated S-75, it mated a new composite airframe with S-76 engines, rotors and powertrain components. Sikorsky S-76 SHADOW Boeing-Sikorsky MANPRINT study. The original concept of the LHX program was to produce a one-man helicopter that could do more than a two-man aircraft. The Sikorsky (S-76) Helicopter Advance Demonstrator of Operators Workload (SHADOW) had a single-pilot advanced cockpit grafted to its nose. The purpose was to study the MANPRINT or human engineering interface between the pilot and the cockpit controls and displays. The cockpit was the prototype of a single-pilot cockpit designed for use on the prototype RAH-66 Comanche armed reconnaissance helicopter. The cockpit was designed so sensors would feed data to the pilot through helmet-mounted displays. The MANPRINT study determined that single-pilot operation of the Comanche was unsafe, and would result in pilot overload. As result of this study, the Comanche was designed to be operated by a crew of two. Operators Civil The S-76 is in civil service around the world with airlines, corporations, hospitals, and government operators. The world's largest civilian fleet is the 79 Sikorsky S-76 helicopters operated by CHC Helicopter Corporation. Current military and government Argentine Air Force Ministry of Transport Japan Coast Guard Royal Jordanian Air Force Philippine Air Force National Airborne Service Corps Ministry of Interior Serbian