Narrative:

This incident took place during a repositioning flight from phx to las. The only passenger aboard was a deadheading company flight attendant, seated in the flight deck jump seat. During climb out from phx, phoenix departure issued a climb to 9000 ft. Just before we leveled at 9000 ft, departure issued traffic at 1 O'clock position, 2 mi, 9000 ft, opposite direction. Immediately after this, TCASII gave us an RA on the traffic. Upon seeing the RA, I disconnected the autoplt and initiated a climb. After climbing approximately 200 ft, the captain pointed out that I had misinterped the RA command, I should have been descending. I immediately reversed direction, beginning a descent. Just as I was beginning to descend, the captain and I spotted the traffic. The other aircraft (a small single-engine, high wing monoplane) passed approximately 50 ft above and 500-1000 ft to our right side. After we reported the traffic in sight, departure issued a further climb. Departure queried us as to whether TCASII had commanded a climb, and the captain admitted that it had not. Supplemental information from acn 630037: we were turned north on a heading to pass 500 ft under a C172. Phx departure advised us of the traffic. I was looking outside for the traffic that was reported at 12 O'clock position and 7500 ft. We were at 7000 ft. As expected, we got a traffic alert. Since ATC had advised us of the traffic, I didn't expect my first officer to take evasive action. We had the traffic on TCASII. Before I knew it, he started a climb and added power, even though the TCASII told us to descend. Supplemental information from acn 630284: jetliner passed me in the opposite direction at about the same altitude and between 1/2 and 1 mi horizontal separation west of my position and turning to the west. After it passed I was advised of traffic at 1 O'clock position, to which I replied 'it just passed me.' I was then told 'traffic no factor.'

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Original NASA ASRS Text

Title: A CARJ HAS AN NMAC WITH A C172 AND THE FO INITIATES A CLB WHEN THE TCASII RA CALLED FOR A DSCNT.

Narrative: THIS INCIDENT TOOK PLACE DURING A REPOSITIONING FLT FROM PHX TO LAS. THE ONLY PAX ABOARD WAS A DEADHEADING COMPANY FLT ATTENDANT, SEATED IN THE FLT DECK JUMP SEAT. DURING CLBOUT FROM PHX, PHOENIX DEP ISSUED A CLB TO 9000 FT. JUST BEFORE WE LEVELED AT 9000 FT, DEP ISSUED TFC AT 1 O'CLOCK POS, 2 MI, 9000 FT, OPPOSITE DIRECTION. IMMEDIATELY AFTER THIS, TCASII GAVE US AN RA ON THE TFC. UPON SEEING THE RA, I DISCONNECTED THE AUTOPLT AND INITIATED A CLB. AFTER CLBING APPROX 200 FT, THE CAPT POINTED OUT THAT I HAD MISINTERPED THE RA COMMAND, I SHOULD HAVE BEEN DSNDING. I IMMEDIATELY REVERSED DIRECTION, BEGINNING A DSCNT. JUST AS I WAS BEGINNING TO DSND, THE CAPT AND I SPOTTED THE TFC. THE OTHER ACFT (A SMALL SINGLE-ENG, HIGH WING MONOPLANE) PASSED APPROX 50 FT ABOVE AND 500-1000 FT TO OUR R SIDE. AFTER WE RPTED THE TFC IN SIGHT, DEP ISSUED A FURTHER CLB. DEP QUERIED US AS TO WHETHER TCASII HAD COMMANDED A CLB, AND THE CAPT ADMITTED THAT IT HAD NOT. SUPPLEMENTAL INFO FROM ACN 630037: WE WERE TURNED N ON A HDG TO PASS 500 FT UNDER A C172. PHX DEP ADVISED US OF THE TFC. I WAS LOOKING OUTSIDE FOR THE TFC THAT WAS RPTED AT 12 O'CLOCK POS AND 7500 FT. WE WERE AT 7000 FT. AS EXPECTED, WE GOT A TFC ALERT. SINCE ATC HAD ADVISED US OF THE TFC, I DIDN'T EXPECT MY FO TO TAKE EVASIVE ACTION. WE HAD THE TFC ON TCASII. BEFORE I KNEW IT, HE STARTED A CLB AND ADDED PWR, EVEN THOUGH THE TCASII TOLD US TO DSND. SUPPLEMENTAL INFO FROM ACN 630284: JETLINER PASSED ME IN THE OPPOSITE DIRECTION AT ABOUT THE SAME ALT AND BTWN 1/2 AND 1 MI HORIZ SEPARATION W OF MY POS AND TURNING TO THE W. AFTER IT PASSED I WAS ADVISED OF TFC AT 1 O'CLOCK POS, TO WHICH I REPLIED 'IT JUST PASSED ME.' I WAS THEN TOLD 'TFC NO FACTOR.'

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.