Commuter has TCASII RA for single engine passing 500 ft below.

Attributes
ACN	264904
Time
Date	199403
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ewr
State Reference	NJ
Altitude	msl bound lower : 5000 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90 artcc : zlc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	other : unknown
Flight Phase	descent : approach
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
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 : 240 flight time total : 11100 flight time type : 5000
ASRS Report	264904
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 1500 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

On vector for ewr at 5000 ft MSL. A single engine aircraft at 4500 ft with new york approach passed under us. TCASII required a 1200 FPM climb (RA). Informed approach of the climb to 6000 ft then returned to 5000 ft.

Original NASA ASRS Text

Title: COMMUTER HAS TCASII RA FOR SINGLE ENG PASSING 500 FT BELOW.

Narrative: ON VECTOR FOR EWR AT 5000 FT MSL. A SINGLE ENG ACFT AT 4500 FT WITH NEW YORK APCH PASSED UNDER US. TCASII REQUIRED A 1200 FPM CLB (RA). INFORMED APCH OF THE CLB TO 6000 FT THEN RETURNED TO 5000 FT.

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.