A COMMUTER FLC FAILED TO CONTACT THE TWR AT THE FAF; AS INSTRUCTED BY THE APCH CTLR. THE APCH CTLR INTERVENED AND THE FLC CONTACTED THE ATCT LCL CTLR BEFORE REACHING LNDG MINIMUMS.

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THIS EVENT OCCURRED WHEN APCH CTL INSTRUCTED US TO CONTACT THE TWR AT ERMIN; THE LOCATOR OM; ON ILS RWY 4R APCH. DUE TO HVY PLT WORKLOAD; I FAILED TO CONTACT THE TWR AT THE SPECIFIED POINT. WE CONTINUED THE APCH AND WERE REMINDED TO GO TO TWR AT APPROX 800 FT AGL. WE THEN WERE CLRED TO LAND BY TWR AT APPROX 500 FT AGL. RWY CONTACT WAS ESTABLISHED AT MINIMUMS AND WE LANDED UNEVENTFULLY. THE TWR MADE A COMMENT SAYING 'I WANT SOME ANSWERS; CONTACT GND.' WE CONTACTED GND AND TAXIED TO THE GATE WITH NO FURTHER ACTION. THE CHAIN OF EVENTS LEADING UP TO THE ERROR WERE A FACTOR. FIRST; CHICAGO APCH ISSUED A HOLDING CLRNC. WHILE PREPARING FOR THE HOLD WE WERE THEN GIVEN VECTORS THROUGH THE LOC AND THEN BACK THE OTHER DIRECTION TO INTERCEPT THE LOC. THIS IS THE POINT IN WHICH WE WERE CLRED FOR THE APCH; GIVEN A SPD RESTR; GIVEN AN ALT; AND THE INSTRUCTION TO CONTACT THE TWR AT THE LOM. THIS IS A PARTICULARLY BUSY TIME IN THE COCKPIT FOR THE PNF DUE TO MY DUTY OF RUNNING CHKLISTS; CONFIGURING THE ACFT; MAKING CALLOUTS; AND RUNNING THE RADIOS. I SIMPLY FORGOT TO CONTACT THE TWR. THIS COULD HAVE EASILY BEEN AVOIDED HAD THE APCH CTLR INSTRUCTED US TO CONTACT THE TWR WHEN HE ACTUALLY WANTED US TO; RATHER THAN TRYING TO FIT A LENGTHY CLRNC ALL IN ONE BREATH.