What was found
CREW REPORTED THAT DURING FLIGHT LOCALIZER SIGNALS ON NAV 1 AND NAV 2 WERE INTERMITTENT UP TO AND SLIGHTLY BEYOND FINAL MARKER ON INSTRUMENT APPROACHES. THE CREW DIVERTED TO KALB AND LANDED WITHOUT INCIDENT. ON CALL MAINTENANCE OPERATIONALLY CHECKED THE ILS SYSTEM AND PERFORMED A VISUAL INSPECTION OF THE ANTENNA'S. OPERATIONAL CHECKS WERE GOOD WITH NO FURTHER DEFECTS NOTED AT THAT TIME. LATER IN THE DAY CMH MAINTENANCE REPLACE THE LEFT-HAND ANTENNA, SERIAL NUMBER 11236, AND THE RIGHT ANTENNA, SERIAL NUMBER 13527A. OPERATIONAL CHECKS WERE GOOD WITH NO FURTHER DEFECTS NOTED.