A319 PIC CONCERNED WITH SJC TFC PROC WHEN LNDG; OBSERVES OPPOSITE DIRECTION FAA NAVAID FLT CHK ACFT EXECUTING A GAR AS A319 FLC IS ON LNDG ROLLOUT.

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WHILE ON APCH RWY 30L SJC; ABOUT 7 MI OUT WE (ACFT X) WERE ADVISED OF OPPOSING TFC ON 'FLT CHK' (FAA FLT CHK) RWY 12R; 8 MI OUT. AS WE WERE AT THE LOCATOR MIDDLE MARKER WHEN WE COULD SE THE ACFT (FLT CHK) (ACFT Y) ON FINAL. AS WE TOUCHED DOWN; THE ACFT (FLT CHK) MADE A LOW APCH AT 100-200 FT DOWN THE RWY; BREAKING OFF L (TO OUR R) IN FRONT OF US. MY CONCERN WAS WHERE WERE WE SUPPOSED TO GO IF WE BALKED THE LNDG? CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR CALLED THE TWR SUPVR TO REGISTER HIS CONCERN WITH THE INCIDENT. THE RPTR STATED HE WAS TASK SATURATED UNTIL TOUCHDOWN; NOT BEING COMPLETELY AWARE OF THE FO'S COMS WITH THE TWR DURING THE EVENT. AT TOUCHDOWN; THE RPTR STATED HE LOOKED UP AND SEEING THE FAA ACFT AT THE OPPOSITE END OF THE RWY; EXECUTING A GAR; WAS MOMENTARILY STARTLED. IN HIS CONVERSATION WITH THE TWR SUPVR; THE RPTR QUESTIONED THE FLT CHK ACFT'S PROX; ASKING WHAT WERE THE OPTIONS HE (THE CTLR) HAD IF HE WAS REQUIRED TO EXECUTE A MISSED APCH. THE RPTR ADVISED THAT HE WAS NOT COMPLETELY HAPPY WITH THE SUPVR'S REASONING; BUT SINCE ALL WORKED OUT; THIS WAS MOSTLY A 'WHAT IF' EXERCISE.