A FALCON 20 FLT CREW INADVERTENTLY ENTERED CLASS B AIRSPACE WITHOUT A CLRNC.

Narrative

WE WERE ON A TRAINING FLT FOR THE FO TO GET TKOF LNDG CURRENT. DEPARTING CONCORD; CA (KCCR) TO MY HOME BASE OF SAN JOSE; CA (KSJC) VFR. DEPARTED RWY 32R AND WAS PLANNING A R DOWNWIND DEP. WE WERE TAKING OFF 30 SECONDS BEHIND A FALCON JET AND WERE ADVISED HE WOULD BE MAKING A R TURN TO THE VOR THEN EBOUND FROM THERE. WE HAD A PLAN E ON 1-2 MI FINAL AND WE WERE IN POS ON RWY. WE THEN REQUESTED A L DOWNWIND DEP AS WE COULD KEEP THE DOWNWIND IN CLOSE. ON OUR L DOWNWIND DEP; WE CONTACTED TWR FOR FREQ CHANGE TO BAY APCH AND REQUESTED VFR TO SAN JOSE. WE WERE SE (HDG 140 DEGS) CLBING TO 3000 FT; 1/2 MI W OF CONCORD. WE MADE CONTACT LEAVING 2200 FT AND WERE TOLD TO STANDBY FOR XPONDER CODE. WE THEN RECEIVED A TCASII TA. WITH TFC AT 11:30 TO 12 O'CLOCK; WE COULD SEE 2 OTHER ACFT ON TCASII AT 10 AND 11 O'CLOCK. WE WERE FORCED TO MAKE A R TURN AT LEAST 20 DEGS AND WERE GIVEN A XPONDER CODE. WE CONFIRMED WITH RADAR CONTACT AND WERE TOLD BY BAY APCH TO FLY DIRECT TO REID HILLVIEW ARPT FOR THE DOWNWIND TO SJC. WE WERE ASKED BY SAN JOSE GND CTL TO CALL BAY APCH ON PHONE. THEY ADVISED WE WERE IN CLASS B WHEN THEY CLRED US TO REID HILLVIEW. PER OUR CHART WE WERE JUST OUTSIDE OF CLASS B; (ENHANCED CLASS B).