Close proximity air carrier medium large transport-GA small aircraft.

Attributes
ACN	93763
Time
Date	198809
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	arrival star : star enroute airway : v52
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 230 flight time total : 16000
ASRS Report	93763
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : nmac
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 50 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Level 10000', established atlis arrival, 323 degree radial st louis VOR, 31 DME, slowing to 250 KT. First officer shouted traffic at 9:30, same altitude, approximately 1000' away. When I looked, traffic was at 8:30, and seemed sure to hit our tail. I turned right and descended losing 500'. Controller did not point out traffic. About one minute later, I asked controller about traffic. He said 'I have traffic 4 mi behind you southwest bound.' about 15 seconds later he said 'now I have VFR beacon (1200) still southwest bound.' aircraft was red small aircraft.

Original NASA ASRS Text

Title: CLOSE PROX ACR MLG-GA SMA.

Narrative: LEVEL 10000', ESTABLISHED ATLIS ARR, 323 DEG RADIAL ST LOUIS VOR, 31 DME, SLOWING TO 250 KT. F/O SHOUTED TFC AT 9:30, SAME ALT, APPROX 1000' AWAY. WHEN I LOOKED, TFC WAS AT 8:30, AND SEEMED SURE TO HIT OUR TAIL. I TURNED R AND DSNDED LOSING 500'. CTLR DID NOT POINT OUT TFC. ABOUT ONE MINUTE LATER, I ASKED CTLR ABOUT TFC. HE SAID 'I HAVE TFC 4 MI BEHIND YOU SW BOUND.' ABOUT 15 SECONDS LATER HE SAID 'NOW I HAVE VFR BEACON (1200) STILL SW BOUND.' ACFT WAS RED SMA.

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.