What was found
ON FLIGHT 3959 AFTER ROTATION THE CREW RECEIVED A LAND AIR/GROUND FAIL MESSAGE ON EICAS. THE GEAR LEVER WOULD NOT RISE. THE CREW ELECTED TO RETURN FOR A NORMAL LANDING. THE AIRCRAFT LANDED UNDER MAXIMUM LANDING WEIGHT. THE EICAS CAUTION MESSAGE WENT AWAY ON TAXI IN. THE AIRCRAFT WAS REMOVED FROM SERVICE. ADJUSTED NOSE LANDING GEAR (WEIGHT ON WHEELS) TARGET IAW EMB - 145 AMM 32-63-05 AND PERFORMED EXTENSION AND RETRACTION TEST. NO PARTS REMOVED OR REPLACED. THE OPERATIONAL CHECK WAS GOOD.