AHRS is described as which of the following?

• A. An inertial navigation system using multiple axes to provide heading, attitude, and yaw
• B. A system composed of three-axis sensors that provide heading, attitude, and yaw information for aircraft, designed to replace traditional mechanical gyroscopic flight instruments
• C. A GPS-based attitude reference system with two-axis sensors
• D. A digital flight computer that processes barometric data

Answer: (B)

AHRS stands for Attitude and Heading Reference System. It uses three-axis sensors—typically including gyros and accelerometers, and often a magnetometer—to determine the aircraft’s orientation (pitch and roll, the attitude) and its direction relative to magnetic north (heading). It also provides information about yaw, the rotation about the vertical axis, which relates to turns and updates the heading as you change direction. This solid-state approach is designed to replace traditional mechanical gyroscopic flight instruments by delivering continuous, integrated attitude and heading data to the cockpit instruments and displays. It’s not GPS-based and doesn’t by itself determine position or flight path, and it relies on more than just two sensors to provide a stable reference.