As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4017 THE CREW REPORTED THAT ON TAKEOFF WHEN SELECTED FLAPS ZERO RECEIVED FLAP FAIL MESSAGE WHEN FLAPS HIT 9 DEGREES AND STUCK THERE. THE CAPTAIN DECLARED AN EMERGENCY AND ELECTED TO RETURN TO ORD. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE LEFT FLAP VELOCITY SENSOR IAW EMB 145 AMM 27-51-12. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.