An SF340 has an altitude deviation as it is approaching wri due to a conflict with an small aircraft...

Attributes
ACN	402873
Time
Date	199805
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : cyn
State Reference	NJ
Altitude	msl bound lower : 3600 msl bound upper : 4000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : wri
Operator	common carrier : air carrier
Make Model Name	SF 340A
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	descent other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 130 flight time total : 5500 flight time type : 1400
ASRS Report	402873
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 800 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

While being vectored from mcguire approach control we were flying at 4000 ft MSL when we noticed a TCASII advisory pop up at 500 ft above us and at the 2 mi range. We advised approach control of it and before he could answer us, we saw that the approaching aircraft was descending through our altitude and within less than 1 mi of us. The TCASII RA announced 'descend now.' we initiated an immediate descent to 3600 ft and we saw the approaching aircraft slightly above and to the left of us. Approach yelled at the cessna for his intentions and he stated he was descending to 1500 ft.

Original NASA ASRS Text

Title: AN SF340 HAS AN ALTDEV AS IT IS APCHING WRI DUE TO A CONFLICT WITH AN SMA.

Narrative: WHILE BEING VECTORED FROM MCGUIRE APCH CTL WE WERE FLYING AT 4000 FT MSL WHEN WE NOTICED A TCASII ADVISORY POP UP AT 500 FT ABOVE US AND AT THE 2 MI RANGE. WE ADVISED APCH CTL OF IT AND BEFORE HE COULD ANSWER US, WE SAW THAT THE APCHING ACFT WAS DSNDING THROUGH OUR ALT AND WITHIN LESS THAN 1 MI OF US. THE TCASII RA ANNOUNCED 'DSND NOW.' WE INITIATED AN IMMEDIATE DSCNT TO 3600 FT AND WE SAW THE APCHING ACFT SLIGHTLY ABOVE AND TO THE L OF US. APCH YELLED AT THE CESSNA FOR HIS INTENTIONS AND HE STATED HE WAS DSNDING TO 1500 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.