Approach controller gave TA to air carrier X at 5000 ft on air carrier Y crossing overhead bdr at 6000 ft. Air carrier X received a TCASII RA on traffic below him and climbed causing less than standard separation with air carrier Y which caused air carrier X to get a descend RA. The controller had no other traffic below or near air carrier X and saw no reason for the climb RA to begin with.

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Attributes
ACN	366540
Time
Date	199704
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : bdr
State Reference	CT
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	SF 340B
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute airway : n90
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 8
ASRS Report	366540
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Because of the amount of VFR traffic near bdr indicating at and below 3500 ft, it was coordinated to leave air carrier X on vyy at 5000 ft (landing jfk). Air carrier Y (BE02 inbound lga on V475 at 6000 ft) was swbound at 6000 ft on V475. Just as I issued traffic to air carrier X, he informed me that he was climbing due to an RA. When I told him that I did not observe any traffic in the area above 3500 ft, he told me his TCASII showed a target 300 ft below him which caused the RA climb. He immediately got an RA for a descent because of air carrier Y. At least one other controller told me that he did not observe any traffic in the area of bdr that would have caused air carrier X to have an RA climb.

Original NASA ASRS Text

Title: APCH CTLR GAVE TA TO ACR X AT 5000 FT ON ACR Y XING OVERHEAD BDR AT 6000 FT. ACR X RECEIVED A TCASII RA ON TFC BELOW HIM AND CLBED CAUSING LTSS WITH ACR Y WHICH CAUSED ACR X TO GET A DSND RA. THE CTLR HAD NO OTHER TFC BELOW OR NEAR ACR X AND SAW NO REASON FOR THE CLB RA TO BEGIN WITH.

Narrative: BECAUSE OF THE AMOUNT OF VFR TFC NEAR BDR INDICATING AT AND BELOW 3500 FT, IT WAS COORDINATED TO LEAVE ACR X ON VYY AT 5000 FT (LNDG JFK). ACR Y (BE02 INBOUND LGA ON V475 AT 6000 FT) WAS SWBOUND AT 6000 FT ON V475. JUST AS I ISSUED TFC TO ACR X, HE INFORMED ME THAT HE WAS CLBING DUE TO AN RA. WHEN I TOLD HIM THAT I DID NOT OBSERVE ANY TFC IN THE AREA ABOVE 3500 FT, HE TOLD ME HIS TCASII SHOWED A TARGET 300 FT BELOW HIM WHICH CAUSED THE RA CLB. HE IMMEDIATELY GOT AN RA FOR A DSCNT BECAUSE OF ACR Y. AT LEAST ONE OTHER CTLR TOLD ME THAT HE DID NOT OBSERVE ANY TFC IN THE AREA OF BDR THAT WOULD HAVE CAUSED ACR X TO HAVE AN RA CLB.

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.