What was found
ON FLIGHT 4350 THE CREW REPORTED THAT ON APPORACH THE FLAPS FAILED IN THE ZERO POSITION. THE CREW COULD NOT OBTAIN ANY FLAPS ON LANDING. THE CREW DECLARED AN EMERGENCY AND RAN THE APPROPRIATE CHECKLIST. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. TROUBLESHOT FLAP SYSTEM IAW EMB 145 AMM 27-51-00. REMOVED AND REPLACED THE FLAP POWER DRIVE UNIT IAW EMB 145 AMM 27-53-04. THE OPERATIONAL CHECK WAS GOOD, NO FURTHER DISCREPANCIES FOUND AT THIS TIME. THE AIRCRAFT WAS RETURNED TO SERVICE.