FLC OF LTT HAS TCASII ALERT FOR TFC IN THE OPPOSITE DIRECTION AND DSNDING. TFC LEVELED AT SAME ALT AND CTR CTLR HAD CALLED TFC BUT FLC UNABLE TO SEE IT. TFC LEVELED AT SAME ALT. CTLR GAVE A TURN VECTOR BUT THIS WOULD PLACE THEM CLOSER TO THE TFC SO THEY DELAYED THE TURN. TCASII GAVE AN ALERT SO A CLB AND TURN AWAY FROM TFC WAS MADE.

Narrative

WE WERE IN CRUISE AT 12000 FT ON A SCHEDULED PART 121 FLT FROM LAX TO BFL. WE WERE IN COM WITH ZLA. NO CLOUDS VISIBLE; GREAT VISIBILITY. OUR TCASII SHOWED TFC AT OUR 12 O'CLOCK POS; ABOVE US ABOUT 700 FT AND DSNDING. OUR CLOSURE RATE INDICATED THE OTHER ACFT WAS GOING THE OPPOSITE DIRECTION. CTR CALLED THIS TFC; BUT WE COULD NOT SEE IT. THIS OTHER ACFT STATED HE WAS DSNDING FOR VNY; ABOUT 20 MI S. AS THE OTHER ACFT NEARED; IT APPEARED HE WOULD PASS BELOW (APPROX 500 FT) US AND TO OUR R (3-4 MI). AS THE OTHER ACFT NEARED TO APPROX 5 MI; OUR TCASII SHOWED HE LEVELED OUT AT OUR ALT. NO ARROW INDICATING DSCNT DISPLAYED ON THE TCASII NEXT TO HIS ACFT. IT APPEARED HE WOULD PASS ONLY 2-3 MI NOW. WE STILL HAD NO VISUAL CONTACT. AT ABOUT 3 MI WITH THE OTHER ACFT DISPLAYED AT OUR 1 O'CLOCK POS AND AT OUR ALT; CTR GAVE US A 15 DEG TURN TO THE R TO JOIN THE ARVIN ARR INTO BFL. ATC SAID THE ACFT WAS NO FACTOR. SINCE THIS VECTOR WOULD PLACE US CLOSER TO THE OTHER ACFT; MY FO AND I DECIDED TO DELAY THE TURN. AS I KEYED THE MIKE TO RESPOND; OUR TCASII UNIT GAVE A 'TFC; TFC' AUDIO WARNING. WE PULLED UP AND TURNED AWAY TO THE L. THIS AUDIO WARNING WAS BROADCAST AND HEARD BY CTR. DURING THE PULL-UP AND SUBSEQUENT RETURN TO ASSIGNED ALT; WE CLBED NEARLY 700 FT TO 12700 FT. WHEN HANDED OFF TO BFL APCH; HE ASKED WHY WE HAD CLBED AND WE RESPONDED 'DUE TO TCASII.' WE NEVER SAW THE OTHER ACFT.