FLC OF A CPR JET FAILED TO OBTAIN LNDG CLRNC DUE TO DISTRS OF ACFT EQUIP PROB; TFC WATCH AND A HIGH CLOSE IN VISUAL APCH THROUGH A BROKEN LAYER OF CLOUDS.

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WHEN WE DEPARTED HRO; WE EXPERIENCED AN UNUSUAL NOISE AND VIBRATION AS THE LNDG GEAR RESTED IN THE GEAR WELL. DUE TO THE WX; RETURN TO HRO WAS NOT AN OPTION. WE CONTINUED TO IXD. WE EXPERIENCED NO FURTHER INDICATION OF A PROB AND DID WHAT TROUBLESHOOTING WE COULD ENRTE. WE WERE VERY INTERESTED IN WHAT WOULD HAPPEN DURING GEAR EXTENSION. WE WERE ON TOP OF A BROKEN TO SCATTERED CLOUD LAYER WHEN APCH CTL CLRED US FOR A VISUAL APCH TO RWY 36 AT IXD; CAUTIONED US TO WATCH FOR JET TFC JUST OFF RWY 18C IXD AND HANDED US OFF TO IXD TWR. TWR ACKNOWLEDGED OUR CALL AND REQUESTED A CALL ON A 2 MI R BASE OR FINAL. WE WERE ABOUT 5 NM OUT AT THIS TIME. THE PNF ACKNOWLEDGED THE REQUEST. WE HAD THE DEPARTING TFC ON TCASII AND WERE TRYING TO ACQUIRE A VISUAL. I WAS STAYING ABOVE AND E OF THE TFC. BEING OCCUPIED WITH ACQUIRING A VISUAL (WHICH I DID); REMAINING CLR OF THE CLOUDS; MAINTAINING ADEQUATE SEPARATION WITH THE DEPARTING TFC; AND MONITORING THE GEAR EXTENSION FOR A PROB ALL WHILE ON A CLOSE IN HIGH APCH. I FAILED TO MONITOR THE PNF FOR THE REQUIRED CALL 2 MI OUT. AT THE END OF OUR ROLLOUT; THE TWR SAID THEY MISSED OUR CALL AT 2 MI. THE PNF ASKED ME IF THEY HAD REQUESTED THE CALL. I SAID YES AND REALIZED HE HAD NOT HEARD THE REQUEST AND NEITHER OF US COULD RECALL GETTING A CLRNC TO LAND. FORTUNATELY THIS DID NOT CREATE A TFC CONFLICT. NO ONE ELSE WAS LNDG OR DEPARTING. I CAN ONLY RECOMMEND AS THE WORKLOAD INCREASES AND PROBS ARISE; ONE MUST INCREASE THEIR DILIGENCE AND NEVER TAKE FOR GRANTED THAT THE OTHER CREW MEMBER HEARD ALL OF THE MESSAGE JUST BECAUSE THEY ACKNOWLEDGED IT.