What was found
PHL - FLT 894 - EN ROUTE PHL-FRA, APPROXIMATELY 35 MILE AFTER TAKEOFF, CREW NOTED THAT BOTH FMC''S WERE PROBLEMATIC. THE TIMES, MILEAGE AND FUEL DISAGREED, AND THE WAYPOINT AND TOTAL MILEAGE WAS NOT CHANGING. FLIGHT RETURNED TO PHL AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE REPLACED THE LEFT FMC AND RELOADED THE NVA DATABASE. (M)