Near midair collision between air carrier-light transport and unk-small transport.

Attributes
ACN	84088
Time
Date	198803
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cvg
State Reference	OH
Altitude	msl bound lower : 6300 msl bound upper : 6500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cvg
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent : approach descent other
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
Flight Plan	None
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	84088
Person 2
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 500 vertical : 250
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Just after we were cleared to descend from 7000' MSL to 5000' MSL, as we were passing through 6300' an small transport passed about 200-300 yds in front of us, about 200-300' above our altitude. When we informed approach of this fact, they stated they had no contact with the other aircraft. Our heading was about 220 degrees and the small transport was traveling approximately 360 degrees. Callback conversation with reporter revealed the following: reporter felt the small transport was probably headed for luk airport to the north of cvg. Could not understand why the TRACON radar was not painting the aircraft and wondered if arsa should not be expanded to cover this traffic.

Original NASA ASRS Text

Title: NMAC BETWEEN ACR-LTT AND UNK-SMT.

Narrative: JUST AFTER WE WERE CLRED TO DSND FROM 7000' MSL TO 5000' MSL, AS WE WERE PASSING THROUGH 6300' AN SMT PASSED ABOUT 200-300 YDS IN FRONT OF US, ABOUT 200-300' ABOVE OUR ALT. WHEN WE INFORMED APCH OF THIS FACT, THEY STATED THEY HAD NO CONTACT WITH THE OTHER ACFT. OUR HDG WAS ABOUT 220 DEGS AND THE SMT WAS TRAVELING APPROX 360 DEGS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR FELT THE SMT WAS PROBABLY HEADED FOR LUK ARPT TO THE N OF CVG. COULD NOT UNDERSTAND WHY THE TRACON RADAR WAS NOT PAINTING THE ACFT AND WONDERED IF ARSA SHOULD NOT BE EXPANDED TO COVER THIS TFC.

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.