TCASII RA causes large transport to descend below assigned altitude.

Attributes
ACN	240171
Time
Date	199304
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ewr
State Reference	NJ
Altitude	msl bound lower : 5200 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90 artcc : zoa
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 10000 flight time type : 800
ASRS Report	240171
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 9000 flight time type : 200
ASRS Report	241319
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 5000 vertical : 0
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Was at 6000 ft being vectored for approach to ewr. Received a TCASII alert. Noticed an aircraft closing us and climbing up towards out altitude. Alert became a TCASII resolution advising us to descend immediately. I did and dove to 5200 ft. At that time ATC advised us that the VFR aircraft had us visually. I filed a report with my company and also talked to newark approach on the telephone.

Original NASA ASRS Text

Title: TCASII RA CAUSES LGT TO DSND BELOW ASSIGNED ALT.

Narrative: WAS AT 6000 FT BEING VECTORED FOR APCH TO EWR. RECEIVED A TCASII ALERT. NOTICED AN ACFT CLOSING US AND CLBING UP TOWARDS OUT ALT. ALERT BECAME A TCASII RESOLUTION ADVISING US TO DSND IMMEDIATELY. I DID AND DOVE TO 5200 FT. AT THAT TIME ATC ADVISED US THAT THE VFR ACFT HAD US VISUALLY. I FILED A RPT WITH MY COMPANY AND ALSO TALKED TO NEWARK APCH ON THE TELEPHONE.

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.