Narrative:

Aircraft X departs lga, turned northwest bound climbing to FL150. Aircraft Y departs hpn airport is turned wbound climbing to FL150. Controller realizes his error and stops aircraft Y at 10100 ft. Aircraft X is at 10700 ft and holds for 2 sweeps of radar. Aircraft are about 2 mi apart and converging. Aircraft Y reports aircraft X in sight. Aircraft X starts a descent at 4000 FPM. (Apparently responding to a TCAS resolution.) aircraft X gets under aircraft Y by aprox 200 ft. This error has been reported. I would like someone concerned and qualified to review and see if TCAS operated correctly and or if any improvements can be made to the software. In this situation, TCAS seems to make a bad situation worse.

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Original NASA ASRS Text

Title: N90 SUPVR/CIC QUESTIONS IF CTLR OPERROR WAS AGGRAVATED BY TCAS ACTION.

Narrative: ACFT X DEPARTS LGA, TURNED NW BOUND CLIMBING TO FL150. ACFT Y DEPARTS HPN ARPT IS TURNED WBOUND CLIMBING TO FL150. CTLR REALIZES HIS ERROR AND STOPS ACFT Y AT 10100 FT. ACFT X IS AT 10700 FT AND HOLDS FOR 2 SWEEPS OF RADAR. ACFT ARE ABOUT 2 MI APART AND CONVERGING. ACFT Y RPTS ACFT X IN SIGHT. ACFT X STARTS A DESCENT AT 4000 FPM. (APPARENTLY RESPONDING TO A TCAS RESOLUTION.) ACFT X GETS UNDER ACFT Y BY APROX 200 FT. THIS ERROR HAS BEEN REPORTED. I WOULD LIKE SOMEONE CONCERNED AND QUALIFIED TO REVIEW AND SEE IF TCAS OPERATED CORRECTLY AND OR IF ANY IMPROVEMENTS CAN BE MADE TO THE SOFTWARE. IN THIS SIT, TCAS SEEMS TO MAKE A BAD SIT WORSE.

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.