NMAC.

Narrative

WE DEPARTED HOBBY AND AS WE CHANGED TO DEP CTL; WE WERE GIVEN INSTRUCTION TO 'TURN TO HDG 150 DEGS; YOU HAVE TFC AT 12 O'CLOCK.' WE LOOKED OUTSIDE (IT WAS VERY HAZY) AND DID NOT ACQUIRE VISUAL. LOOKING ON TCASII WE SAW SEVERAL ACFT WHICH COULD HAVE BEEN TARGETS BUT THEN SAW ONE THAT SHOWED APPROX 800 FT AND ABOVE AND APCHING DIRECTLY AHEAD AS WE ROLLED OUT ON THE ASSIGNED HDG. CLB WAS CONTINUED AND HDG WAS CHANGED TO APPROX 130 DEGS FOR AVOIDANCE. AT THAT TIME THE TFC DISAPPEARED FROM THE SCREEN MOMENTARILY (WHICH WAS VERY DISCONCERTING). WHEN THE TFC REAPPEARED; IT WAS AGAIN AT 12 O'CLOCK POS WITH TA FOLLOWED BY DSND RA. WE WERE STILL TRYING TO ACQUIRE VISUAL. AS PF I STARTED A DSCNT; WHEN MY FO CALLED 'I'VE GOT HIM AND I'VE GOT THE AIRPLANE!' HE INITIATED IMMEDIATE FULL PWR CLB THROUGH 2000 FT. ON TCASII THE ACFT PASSED 400 FT BELOW AND SLIGHTLY S OF OUR POS. THIS SIT WAS COMPLICATED BY A NUMBER OF FACTORS: 1) HAZY FLT CONDITIONS. 2) LOT OF COM ON THE FREQ 3) OUR MOBILITY TO DETERMINE WHERE THE OTHER ACFT WAS GOING. 4) APPARENT CONFUSION OF TCASII (SCREEN BLANKING OUT; CONFLICTING RA) ADDING TO OUR CONFUSION. 5) HIGH WORKLOAD CONDITIONS IN COCKPIT (TURN INITIATED BTWN 500 FT AND 1000 FT AGL: CLEAN UP COMPLETED AFTER THE TFC WAS CLRED.