Which system provides heading, attitude, and yaw information for aircraft?

• A. Magnetic Compass
• B. Attitude Indicator
• C. AHRS
• D. Electronic Flight Instrument System

Answer: (C)

The system that provides heading, attitude, and yaw information is the AHRS. It combines data from gyros and accelerometers to determine the airplane’s orientation in three axes: pitch (nose up/down), roll (tilt left/right), and yaw (rotation about the vertical axis), and it also supplies the heading (typically magnetic) used by the flight displays. This integrated sensor package feeds the primary flight display and related instruments so you can see the aircraft’s attitude and direction in one coherent picture, along with the rate of turn or yaw information.

A magnetic compass only gives heading and can be affected by magnetic interference or errors. An Attitude Indicator shows only the aircraft’s pitch and bank, not heading or yaw. EFIS is a display system that presents data from various sensors (often including AHRS) but is not itself the source of heading/attitude/yaw data.