A flight crew received a TCASII TA then an RA near teb.

Attributes
ACN	451246
Time
Date	199909
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : teb.vor
State Reference	NJ
Altitude	msl bound lower : 5000 msl bound upper : 5700
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90.tracon
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 23000 flight time type : 8000
ASRS Report	451246
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

After just leveling at 5000 ft radar vectors runway 22L ewr, observed aircraft on TCASII at 2:30 - 3 O'clock position, 1900 ft below. As it approached us, it began a climb. Broken cloud tops at 5000 ft. TCASII TA for aircraft, then RA. Started climb at 5300 ft. Got second TA to increase climb (aircraft never seen). Clear of conflict at 5700 ft. We returned to 5000 ft. ATC gave turn to 120 degrees, descend to 4000 ft, slow to 180 KTS to follow B747. While complying, asked for controller initials. Captain spoke to supervisor on ground. I am not sure if aircraft in conflict was under ATC control, but broken clouds in area. Maybe aircraft was trying to climb to VFR on top. Many aircraft on TCASII screen. Controller very busy.

Original NASA ASRS Text

Title: A FLC RECEIVED A TCASII TA THEN AN RA NEAR TEB.

Narrative: AFTER JUST LEVELING AT 5000 FT RADAR VECTORS RWY 22L EWR, OBSERVED ACFT ON TCASII AT 2:30 - 3 O'CLOCK POS, 1900 FT BELOW. AS IT APCHED US, IT BEGAN A CLB. BROKEN CLOUD TOPS AT 5000 FT. TCASII TA FOR ACFT, THEN RA. STARTED CLB AT 5300 FT. GOT SECOND TA TO INCREASE CLB (ACFT NEVER SEEN). CLR OF CONFLICT AT 5700 FT. WE RETURNED TO 5000 FT. ATC GAVE TURN TO 120 DEGS, DSND TO 4000 FT, SLOW TO 180 KTS TO FOLLOW B747. WHILE COMPLYING, ASKED FOR CTLR INITIALS. CAPT SPOKE TO SUPVR ON GND. I AM NOT SURE IF ACFT IN CONFLICT WAS UNDER ATC CTL, BUT BROKEN CLOUDS IN AREA. MAYBE ACFT WAS TRYING TO CLB TO VFR ON TOP. MANY ACFT ON TCASII SCREEN. CTLR VERY BUSY.

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.