"Hydraulic servomechanisms." . . "Roll." . . "Maintainability." . . "Hydraulic and Pneumatic Equipment." . . "Test and evaluation." . . . . . . . . . . . . "Hydrofluidic stability augmentation systems (HYSAS) were evaluated in operational military helicopters for 1-1/2 years to establish a measure of maintainability and reliability for this relatively new technology. Design details, manufacturing problems encountered, installation experiences, and operational problems are discussed. Reliability predictions for fluidic systems and a similar electronic stabilization system are also presented. (Author)."@en . . . "Hydrofluidic stability augmentation system(HYSAS) operational suitability demonstration"@en . . . . . . . . . . . "Demonstrations." . . "Hydraulic actuators." . . "HONEYWELL INC ST LOUIS PARK MN AVIONICS DIV." . . "Field tests." . . "Yaw." . . "Helicopters." . . . . "Observation aircraft." . . "Reliability." . . "Hydrofluidics." . . "Electroforming." . . "Flight control systems." . . "Aerodynamic stability." . . "Patrol and Reconnaissance Aircraft." . .