What was found
DURING THE CLIMB, FOS ALTIMETER WAS ERRATIC, FLUCTUATING ABOUT 500FT. PERFORMED PITOT STATIC TEST AND PUMPED UP AIRSPEED AND ALTITUDE, NOTED BOTH CAPTAIN'S AND FIRST OFFICERS ALTIMETERS CLIMBED EVENLY WITH NO ERRADIC FLUCUATIONS NOTED REF A300-600 M/M. REMOVED AND REPLACED THE F/O'S ALTIMETER PRECAUTIONARY REF M/M 34-12-21-04. A/C OK FOR SERVICE.