Be thankful they only lost CPDLC and some instruments. On some Embraer's loss of GPS can affect the flight controls...I'm led to believe Garmin finally updated the software in the yaw damper to somewhat guard against the loss of GPS affecting it to such an extent early last year.
Originally Posted by The FAA
EMBRAER HAS RECENTLY RECEIVED A REPORT OF GPS 1 AND 2 SIMULTANEOUS SIGNAL LOSS DURING FMS NAVIGATION IN CRUISE FLIGHT FOLLOWED BY A GPS HSI 1 AND 2 FAILURE INDICATION, ATTITUDE AND HEADING REFERENCE SYSTEM (AHRS) 1 AND 2 FAULT AND, AFTER A FEW MINUTES, A STALL WARNING PROTECTION SYSTEM (SWPS) FAULT, VENTRAL RUDDER FAIL, YAW DAMPER FAIL, AUTO PILOT FAIL, AND CAS MESSAGES ASSOCIATED WITH UNEXPECTED ROLLING AND YAWING OSCILLATIONS (DUTCH ROLL) AT HIGH AIRSPEEDS.
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