N90 supervisor/controller in charge questions if controller operational error was aggravated by TCAS...

Attributes
ACN	527056
Time
Date	200110
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lga.airport
State Reference	NY
Altitude	msl bound lower : 9900 msl bound upper : 10100
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : n90.tracon tracon : syr.tracon
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude descent other
Aircraft 2
Controlling Facilities	tracon : n90.tracon
Make Model Name	Harrier
Flight Phase	climbout : intermediate altitude
Person 1
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
ASRS Report	527056
Person 2
Affiliation	government : faa
Function	controller : departure
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : published procedure non adherence : required legal separation
Independent Detector	atc equipment : conflict alert aircraft equipment : tcas other controllera
Resolutory Action	aircraft : automation overrode flight crew controller : issued new clearance
Miss Distance	horizontal : 1500 vertical : 200
Supplementary
Problem Areas	Aircraft ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

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.

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.

N90 supervisor/controller in charge questions if controller operational error was aggravated by TCAS action.