Potential conflict between descending air carrier-medium large transport and GA-small aircraft.

Attributes
ACN	97044
Time
Date	198810
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : fsd
State Reference	SD
Altitude	msl bound lower : 7400 msl bound upper : 7500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : fsd
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Flight Plan	None
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 105 flight time total : 12000 flight time type : 80
ASRS Report	97044
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 2000 vertical : 150
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Flying an small aircraft VFR x-c en route from scottsbluff, northeast to redwood falls, mn, contacted sioux falls approach control for traffic advisories through area. Although non transponder, radar contact was established after turn for identify about 20 mn southwest of fsd. Radar service was terminated about 20 NM ene and frequency change approved. About 2 mins later, I observed an medium large transport coming right to left in a right turn. I broke right as he passed in front and slightly below me. He appeared to turn back left after passing. I feel I would have been able to be more alert to situation by staying on approach control frequency if radar contact could have been maintained for a longer time. I had not been advised of the medium large transport and do not know if he had been advised of my presence.

Original NASA ASRS Text

Title: POTENTIAL CONFLICT BETWEEN DESCENDING ACR-MLG AND GA-SMA.

Narrative: FLYING AN SMA VFR X-C ENRTE FROM SCOTTSBLUFF, NE TO REDWOOD FALLS, MN, CONTACTED SIOUX FALLS APCH CTL FOR TFC ADVISORIES THROUGH AREA. ALTHOUGH NON TRANSPONDER, RADAR CONTACT WAS ESTABLISHED AFTER TURN FOR IDENT ABOUT 20 MN SW OF FSD. RADAR SVC WAS TERMINATED ABOUT 20 NM ENE AND FREQ CHANGE APPROVED. ABOUT 2 MINS LATER, I OBSERVED AN MLG COMING RIGHT TO LEFT IN A RIGHT TURN. I BROKE RIGHT AS HE PASSED IN FRONT AND SLIGHTLY BELOW ME. HE APPEARED TO TURN BACK LEFT AFTER PASSING. I FEEL I WOULD HAVE BEEN ABLE TO BE MORE ALERT TO SITUATION BY STAYING ON APCH CTL FREQ IF RADAR CONTACT COULD HAVE BEEN MAINTAINED FOR A LONGER TIME. I HAD NOT BEEN ADVISED OF THE MLG AND DO NOT KNOW IF HE HAD BEEN ADVISED OF MY PRESENCE.

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.