Flight crew of medium large transport has near midair collision with single engine small aircraft on approach. Possible TCASII failure.

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Attributes
ACN	371056
Time
Date	199706
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : swf
State Reference	NY
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 80 flight time total : 20000 flight time type : 1400
ASRS Report	371056
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 600 vertical : 600
Supplementary
Primary Problem	Ambiguous

Narrative:

No TCASII warning or conflict shown. ATC not aware and did not paint traffic even after advised. Traffic small single engine cessna. TCASII system test normal.

Original NASA ASRS Text

Title: FLC OF MLG HAS NMAC WITH SINGLE ENG SMA ON APCH. POSSIBLE TCASII FAILURE.

Narrative: NO TCASII WARNING OR CONFLICT SHOWN. ATC NOT AWARE AND DID NOT PAINT TFC EVEN AFTER ADVISED. TFC SMALL SINGLE ENG CESSNA. TCASII SYS TEST NORMAL.

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.