Final answer:
When prompted with an AHRS DATA INVLD message on the FMA, it indicates a problem with the Aircraft's Attitude and Heading Reference System, which provides essential flight data. Pilots must then follow specific procedures to manage the situation. This could involve troubleshooting the system or verifying its calibration.
Step-by-step explanation:
If you encounter an AHRS DATA INVLD message on the Flight Mode Annunciator (FMA), this indicates that the Aircraft's Attitude and Heading Reference System (AHRS) is providing invalid data. The AHRS is an onboard system that feeds critical attitude, heading, and yaw information to the aircraft's flight instruments. Such a message suggests that the system either has malfunctioned, is not calibrated, or there is a communication issue between the AHRS and the aircraft's avionics.
To address this message, a pilot would typically refer to the aircraft's emergency or abnormal procedures to troubleshoot and resolve the issue. This would ensure the safety and directional control of the flight is maintained. In training terms, it is important for students to understand not only what the warning indicates but also the procedures to correct the situation and the importance of the AHRS in overall aircraft operation.