Reporter aircraft sighted another air carrier aircraft in their vicinity while descending for approach to arrival airport. No real conflict took place due in large part to other aircraft maneuvering away from reporer aircraft and toward arrival airport.

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Attributes
ACN	106638
Time
Date	198903
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sdf
State Reference	KY
Altitude	msl bound lower : 10400 msl bound upper : 10400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sdf
Operator	common carrier : air carrier
Make Model Name	Heavy Transport, Low Wing, 4 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 13000
ASRS Report	106638
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 3000
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Sdf approach cleared air carrier a xx to 10000' heading 280 degree. At approximately 10400 air carrier B xy an medium large transport, was sighted at my 9 O'clock position and wing up in a turn toward airport. Due to his turn there was no imminent threat of collision. Aircraft passed within 1/2 mile. Both aircraft landed safely. Clearance to 10000 was heard by all crew members and read back to approach control.

Original NASA ASRS Text

Title: REPORTER ACFT SIGHTED ANOTHER AIR CARRIER ACFT IN THEIR VICINITY WHILE DESCENDING FOR APCH TO ARR ARPT. NO REAL CONFLICT TOOK PLACE DUE IN LARGE PART TO OTHER ACFT MANEUVERING AWAY FROM REPORER ACFT AND TOWARD ARRIVAL ARPT.

Narrative: SDF APCH CLRED ACR A XX TO 10000' HDG 280 DEG. AT APPROX 10400 ACR B XY AN MLG, WAS SIGHTED AT MY 9 O'CLOCK POS AND WING UP IN A TURN TOWARD ARPT. DUE TO HIS TURN THERE WAS NO IMMINENT THREAT OF COLLISION. ACFT PASSED WITHIN 1/2 MILE. BOTH ACFT LANDED SAFELY. CLRNC TO 10000 WAS HEARD BY ALL CREW MEMBERS AND READ BACK TO APCH CTL.

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.