What was found
ON FLIGHT 4276 THE CREW REPORTED THAT DURING ROTATION RECEIVED A "LDG AIR/GND FAIL" EICAS MESSAGE. THE MESSAGE IMMEDIATELY WENT AWAY. THE CREW DECLARED AN EMERGENCY. THE CREW RECEIVED THE SAME MESSAGE ON TOUCHDOWN/ROLLOUT. THE AIRCRAFT WAS REMOVED FROM SERVICE. SERVICED NOSE LANDING GEAR IAW EMB AMM 32-20-01. PERFORMED AN OPERATIONAL CHECK OF AIR/GROUND WEIGHT ON WHEELS SYSTEM IAW EMB AMM 32-63-00. NO DEFECTS NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.