What was found
CREW REPORTED, HEARD A LOUD NOISE THE ENTIRE FLIGHT AND BELIEVED THAT THE NOSE LANDING GEAR DOOR DID NOT CLOSE. THE CREW INSPECTED THE AIRCRAFT AND NOTED THAT ALL OF THE PANELS WERE CLOSED. THE CREW ALSO NOTED THAT ALL GEAR INDICATIONS WERE NORMAL. THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE PLACED THE AIRCRAFT UPON JACKS AND CONFIRMED THAT THE NOSE LANDING GEAR DOORS WERE NOT CLOSING UPON GEAR RETRACTION. THEY REPLACED THE NOSE LANDING GEAR SEQUENCE SWITCH AND OPERATIONAL CHECKS WERE GOOD WITH NO FURTHER DEFECT NOTED.