B757 FLC ENCOUNTERED TWIN ACFT JUST AFTER TKOF SLC. APPARENTLY BOTH ACFT WERE ISSUED R TURN HDGS TO 280 DEGS OFF PARALLEL RWYS.

Narrative

WE WERE CLRED INTO POS AND HOLD ON RWY 16R IN SLC AND THEN CLRED TO TURN R TO 280 DEGS; CLRED FOR TKOF. WHILE IN THE TURN TO 280 DEGS; APCHING 1800 FT AGL; FLAP RETRACTION IN PROGRESS ACCELERATING THROUGH 180 KTS WE GOT A TCASII CORRECTIVE RA. AURAL WARNING 'DSND; DSND.' A QUICK GLANCE AT THE VSI INDICATED A RED TARGET AT 10 O'CLOCK; VERY CLOSE; AND COMMANDING A DSCNT OF ABOUT 1500 FPM. AS I SIMULTANEOUSLY ROLLED OUT OF BANK; REDUCED PITCH TO STOP CLB AND BEGIN DSCNT; I VISUALLY ACQUIRED THE CONFLICT ACFT IN MY 10 O'CLOCK POS; RANGE ABOUT 800 FT AND CLOSING; VERY SLIGHTLY HIGHER AND APPEARED TO BE WBOUND. I SNATCHED THE THROTTLES BACK AND VISUALLY MANEUVERED APPROX 150 FT BELOW THE TAIL OF A HIGH WING; TWIN ENG ACFT. MY ROLLOUT HDG WAS 240 DEGS; WHICH WAS MAINTAINED UNTIL CLR OF CONFLICT. (HAD A LITTLE FLASHBACK TO MIL FIGHTER RENDEZVOUS.) THIS INCIDENT ENCOMPASSED SOME OF THE MOST COMPLEX AND CRITICAL SET OF CIRCUMSTANCES I CAN IMAGINE. THE CONFLICT ACFT WAS CLRED FOR TKOF ON RWY 16L WITH A R TURN TO 280 DEGS ON THE SLC RWY 16L TWR FREQ. WE WERE NOT ADVISED ON THE RWY 16R TWR FREQ AND HAD NO KNOWLEDGE OF THIS ACFT OR ITS INTENDED FLT PATH ACROSS OUR COURSE. WE DID NOT SEE THE ACFT WHEN WE RECEIVED TKOF CLRNC. (IT SHOULD BE NOTED THAT THE LIGHT TWIN HAD NO DISTINCTIVE MARKINGS AND THE COLOR APPEARED BEIGE; WHICH PROVIDED VERY LITTLE CONTRAST FOR VISUAL ACQUISITION IN A LIGHT BROWN HAZE.) OUR TCASII WARNINGS ARE INHIBITED BELOW 1000 FT AGL AND I BELIEVE WHEN TCASII BECAME UNINHIBITED IT ATTEMPTED A TA WHICH ALMOST IMMEDIATELY CHANGED TO AN RA AS WE WERE TURNING; CLBING; ACCELERATING; RETRACTING FLAPS AND RAPIDLY CLOSING ON THE UNSEEN ACFT IN A NEAR PERFECT RENDEZVOUS. THE SLC TWR TA WAS RECEIVED TOO LATE. I BELIEVE THE COPLT RESPONDED WITH SOMETHING LIKE; 'YEAH; WE ALMOST HIT HIM.' IT WAS A BIT TOO CLOSE FOR COMFORT. I BELIEVE THE PRIMARY CAUSE OF THIS INCIDENT WAS THAT THE PLTS WERE LEFT OUT OF THE LOOP IN THIS ATC COORDINATED DEP. DUAL TWR FREQS; FAILURE TO INFORM PLTS OF RWY 16L TFC GOING WBOUND AND TWR CTLR APPARENTLY DISTR BY ARR TFC ON RWY 16R; RESULTED IN 2 DEPS BEING SENT INTO SAME AIRSPACE AT THE SAME TIME. SINGLE FREQ OPS; UNFORTUNATELY; ARE A THING OF THE PAST. IN A SIT LIKE THIS; IT MUST BE MANDATORY TO INFORM THE PLTS WHEN GOING INTO POS AND HOLD THAT THEY ARE HOLDING FOR TFC DEPARTING FROM RWY XX AND WHAT DIRECTION IT IS GOING. A POSSIBLE CONTRIBUTING FACTOR WAS THE LACK OF 'HIGH VISIBILITY' PAINT OR MARKINGS ON THE LIGHT TWIN. THE COINCIDENTAL GEOMETRY INVOLVED IN THIS SETUP MADE VISUAL AWARENESS OF THE CONFLICT DIFFICULT AND COULD JUST AS EASILY HAVE BEEN FATAL. I AM GOING TO TRY TO INCREASE MY ATTN TO THE AIRSPACE I AM TURNING AWAY FROM AS WELL AS SCANNING THE SPACE I AM TURNING INTO. IT IS DISTURBING TO THINK THAT THIS SAME SCENARIO COULD HAVE OCCURRED UNDER IFR CONDITIONS.