Traffic advisory given but flight crew complied with TCAS resolution advisory and climbed 600 ft.

Attributes
ACN	183456
Time
Date	199106
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lga
State Reference	NY
Altitude	msl bound lower : 11000 msl bound upper : 11600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : instrument pilot : commercial pilot : atp pilot : flight engineer
Experience	flight time total : 1550
ASRS Report	183456
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 1100
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

At 11000 got a 'TA' then a 'RA' alert on TCAS that commanded a 2500 FPM rate of climb for traffic at 10500 flying VFR. Just before the 'RA' command, ATC advised of traffic at 10500. The first officer was flying and reacted to the 'RA' by climbing to 11600. We had what we thought was the traffic in sight but we couldn't be sure because that particular aircraft did not seem to be that much of a conflict. ATC was advised of our altitude deviation. ATC did not seem that concerned. The traffic passed about 1 NM off our right side and was level at 10500. (We were on the 'nanci' arrival to lga.)

Original NASA ASRS Text

Title: TFC ADVISORY GIVEN BUT FLC COMPLIED WITH TCAS RESOLUTION ADVISORY AND CLBED 600 FT.

Narrative: AT 11000 GOT A 'TA' THEN A 'RA' ALERT ON TCAS THAT COMMANDED A 2500 FPM RATE OF CLB FOR TFC AT 10500 FLYING VFR. JUST BEFORE THE 'RA' COMMAND, ATC ADVISED OF TFC AT 10500. THE FO WAS FLYING AND REACTED TO THE 'RA' BY CLBING TO 11600. WE HAD WHAT WE THOUGHT WAS THE TFC IN SIGHT BUT WE COULDN'T BE SURE BECAUSE THAT PARTICULAR ACFT DID NOT SEEM TO BE THAT MUCH OF A CONFLICT. ATC WAS ADVISED OF OUR ALT DEV. ATC DID NOT SEEM THAT CONCERNED. THE TFC PASSED ABOUT 1 NM OFF OUR R SIDE AND WAS LEVEL AT 10500. (WE WERE ON THE 'NANCI' ARR TO LGA.)

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.