ATTITUDE AND HEADING REFERENCE SYSTEM (AHRS) LCR-93 is an all attitude inertial sensor system. Provides aircraft attitude, heading and flight dynamics information to display, flight control, weather radar antenna platform and other aircraft systems and instruments. Uses fibre optic rate gyros (FOGs) and micromechanical accelerometers which are ” strapped down ” to the principal aircraft axes. Digital computer mathematically integrates the rate data to obtain heading, pitch and roll.