Medium large transport and small transport have near midair collision in N90 airspace.

Attributes
ACN	96127
Time
Date	198810
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bwz
State Reference	NJ
Altitude	msl bound lower : 9200 msl bound upper : 9500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : cfi pilot : commercial pilot : atp
Experience	flight time last 90 days : 250 flight time total : 3600 flight time type : 900
ASRS Report	96127
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 140 flight time total : 8000 flight time type : 500
ASRS Report	95935
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 350
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Flight on radar vectors from ny departure. First officer was climbing to an assigned altitude of 15000' with captain working radios and looking for traffic. At approximately 8600' (3000 FPM/250 KTS), captain spotted small transport commuter at our 9:30 position (moving left to right). Captain called for immediate level off. Small transport aircraft passed overhead approximately 300-400'. ATC never advised our flight of the conflicting traffic. Captain questioned ATC about the small transport and we were told he was at 9500' and ATC confirmed we were cleared to 15000'. Supplemental information from acn 95935: ATC never said anything about traffic until he was past. If they (ATC) did call the traffic they were stepped on, as lots of aircraft were keying over one another on radios.

Original NASA ASRS Text

Title: MLG AND SMT HAVE NMAC IN N90 AIRSPACE.

Narrative: FLT ON RADAR VECTORS FROM NY DEP. F/O WAS CLBING TO AN ASSIGNED ALT OF 15000' WITH CAPT WORKING RADIOS AND LOOKING FOR TFC. AT APPROX 8600' (3000 FPM/250 KTS), CAPT SPOTTED SMT COMMUTER AT OUR 9:30 POS (MOVING LEFT TO RIGHT). CAPT CALLED FOR IMMEDIATE LEVEL OFF. SMT ACFT PASSED OVERHEAD APPROX 300-400'. ATC NEVER ADVISED OUR FLT OF THE CONFLICTING TFC. CAPT QUESTIONED ATC ABOUT THE SMT AND WE WERE TOLD HE WAS AT 9500' AND ATC CONFIRMED WE WERE CLRED TO 15000'. SUPPLEMENTAL INFO FROM ACN 95935: ATC NEVER SAID ANYTHING ABOUT TFC UNTIL HE WAS PAST. IF THEY (ATC) DID CALL THE TFC THEY WERE STEPPED ON, AS LOTS OF ACFT WERE KEYING OVER ONE ANOTHER ON RADIOS.

Data retrieved from NASA's ASRS site as of August 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.