Large transport has near midair collision with small transport on climb. Traffic not called.

Attributes
ACN	124325
Time
Date	198910
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : gso
State Reference	NC
Altitude	msl bound lower : 6500 msl bound upper : 6600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : gso
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
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 100 flight time total : 13750 flight time type : 5000
ASRS Report	124325
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 500 vertical : 200
Supplementary
Primary Problem	ATC Human Performance

Narrative:

Flying from gso-bwi, cleared from 6000' to 10,000' at 6500-6600 miss occurred. Departure (gso) had him intermittently on radar, per supervisor I talked with by phone after landing bwi. We were never advised of VFR traffic, until after incident. The aircraft was a twin small transport, which should have operable transponder.

Original NASA ASRS Text

Title: LGT HAS NMAC WITH SMT ON CLIMB. TRAFFIC NOT CALLED.

Narrative: FLYING FROM GSO-BWI, CLRED FROM 6000' TO 10,000' AT 6500-6600 MISS OCCURRED. DEP (GSO) HAD HIM INTERMITTENTLY ON RADAR, PER SUPVR I TALKED WITH BY PHONE AFTER LNDG BWI. WE WERE NEVER ADVISED OF VFR TFC, UNTIL AFTER INCIDENT. THE ACFT WAS A TWIN SMT, WHICH SHOULD HAVE OPERABLE XPONDER.

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.