Reporter states they had a TCASII RA with aircraft Y.

Attributes
ACN	443811
Time
Date	199907
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : n90.tracon
State Reference	NY
Altitude	msl bound lower : 9000 msl bound upper : 10000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90.tracon
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : minks
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : n90.tracon
Operator	Other
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	443811
Person 2
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : separated traffic flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

On descent into lga on the minks arrival, ATC originally gave us instructions to expect lda to runway 22. After passing yardley we were at 10000 ft and 300 KTS. We were then given instructions to descend to 9000 ft, do a left 360 degree turn, and then head 80 degrees to intercept runway 4. As I slowed and turned, I did not immediately start my descent. In the turn I was distraction by the TCASII showing traffic as we turned. The first officer said we were cleared to 9000 ft and I started descending. We got an RA on the TCASII and we expedited to 9000 ft. After we leveled, we got a clear of conflict. There was another aircraft behind us that had been cleared to 10000 ft. This was also at the end of a 14+ hour duty period.

Original NASA ASRS Text

Title: RPTR STATES THEY HAD A TCASII RA WITH ACFT Y.

Narrative: ON DSCNT INTO LGA ON THE MINKS ARR, ATC ORIGINALLY GAVE US INSTRUCTIONS TO EXPECT LDA TO RWY 22. AFTER PASSING YARDLEY WE WERE AT 10000 FT AND 300 KTS. WE WERE THEN GIVEN INSTRUCTIONS TO DSND TO 9000 FT, DO A L 360 DEG TURN, AND THEN HEAD 80 DEGS TO INTERCEPT RWY 4. AS I SLOWED AND TURNED, I DID NOT IMMEDIATELY START MY DSCNT. IN THE TURN I WAS DISTR BY THE TCASII SHOWING TFC AS WE TURNED. THE FO SAID WE WERE CLRED TO 9000 FT AND I STARTED DSNDING. WE GOT AN RA ON THE TCASII AND WE EXPEDITED TO 9000 FT. AFTER WE LEVELED, WE GOT A CLR OF CONFLICT. THERE WAS ANOTHER ACFT BEHIND US THAT HAD BEEN CLRED TO 10000 FT. THIS WAS ALSO AT THE END OF A 14+ HR DUTY PERIOD.

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.