What was found
WHILE AT CRUISE ALTITUDE OF 14,000FT, ON A VERY COLD DAY THE G500 PANEL FLAGGED THE AIRSPEED, ALTITUDE, AIS, OAT, HEADING AND HORIZON ALL "X" OUT WITH BIG RED X'S. LOSS OF ALL DATA FROM THE AHARS. PILOT USED THE BACK UP INSTRUMENTS TO COMPLETE THE FLIGHT. WHENEVER COLD, THE UNIT WOULD FAULT.