FLC OF A CPR OPERATED BEECH 1900 LANDED WITHOUT CLRNC DUE TO NOT BEING INSTRUCTED TO DO SO BY APCH AND COMPLACENCY.

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WE WERE ON AN IFR FLT PLAN FROM SAC TO SJC WITH THE FLT TERMINATING AT THE SJC ARPT. WE WERE ON BAY APCH ON A R DOWNWIND FOR A LNDG ON RWY 12R. BAY CLRED US FOR A VISUAL APCH AND INSTRUCTED US TO TURN BASE OVER MOFFETT AT 2000 FT TO ALLOW FOR DEPS AT SJC. A SHORT TIME LATER; BAY CAME BACK AND CLRED US TO TURN BASE BEFORE MOFFETT BECAUSE THERE WERE NO DEPS IN PROGRESS AT THE TIME. I WAS THE PNF AND MY FO WAS THE PF. WE TURNED BASE AND I RAN THE BEFORE LNDG CHKLIST. IT WAS A CHILLY MORNING SO WE HAD THE HEAT ON IN THE CABIN. THE COCKPIT WAS WARM; THE FLT WAS SMOOTH AND THERE WAS NO TFC ON THE FREQ AND NOTHING MOVING ON THE GND AT SJC. OUR LNDG WAS UNEVENTFUL AND QUITE NORMAL UNTIL I REACHED UP TO CHANGE TO GND CTL FREQ AND FOUND TO MY HORROR THAT WE WERE STILL ON THE APCH FREQ. I IMMEDIATELY SWITCHED TO TWR AND CONFESSED MY GRIEVOUS ERROR. WE WERE VERY LUCKY THAT WE WERE THE ONLY ACFT IN THE PATTERN AT THE TIME (A VERY UNUSUAL SIT AT SJC). THE LAST COM WAS WITH BAY APCH BEFORE REACHING MOFFETT. BAY DID NOT HAND US OFF TO THE TWR. WE SHOULD HAVE CAUGHT THIS. FACTORS WHICH CONTRIBUTED TO THIS SIT INCLUDE THE FOLLOWING: 1) WE FREQUENT SJC ON A DAILY BASIS AND THEREFORE WERE COMPLACENT. 2) THIS WAS THE 4TH EARLY WAKE-UP THIS WK AND WE WERE BOTH A LITTLE WEARY. 3) EVEN THOUGH I TRY TO RUN A TIGHT AND DISCIPLINED COCKPIT -- BY THE BOOK -- THIS MORNING I WAS ENJOYING THE SIGHTS AND DID NOT KEEP MY MIND IN THE COCKPIT. REPETITIOUS FLTS SUCH AS THIS ONE CAN BE FINE TUNED TO RUN VERY SMOOTHLY; HOWEVER; WE MUST DISCIPLINE OURSELVES TO NOT ALLOW OUR ATTN TO BE DIVERTED BECAUSE WE HAVE DONE IT SO MANY TIMES.