A helicopter drive system test facility was designed by EDF for NAVAIR's PSEF facility in Patuxent River, Maryland. The facility is designed to accommodate the Navy's entire fleet of single and double rotor-wing aircraft including future variants and some of the most powerful helicopter drive systems in existence. The newly-designed facility will be capable of simulating flight conditions "on the fly" from the control room. The operator can apply varying lift loads, shear loads, and pitch and roll moments in any combination while torque and horsepower are being reacted and monitored.