A B737 has TCASII RA during a visual approach into atl, GA.

Attributes
ACN	392580
Time
Date	199801
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
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 : 8000 flight time type : 50
ASRS Report	392580
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : became reoriented
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

While on visual approach to runway 26R in atl, descending as cleared from 5000 ft to 4000 ft, got TCASII RA to descend. Target aircraft showed 200 ft below and climbing at 11 O'clock position. Subject aircraft was visually idented to be an air carrier brasilia in a left turn at approximately 4500 ft. Subject aircraft passed off right side co-altitude at approximately 1 1/2 mi. Descent to 4000 ft was continued and no other action was necessary. First officer was flying aircraft and both pilots visually idented target aircraft.

Original NASA ASRS Text

Title: A B737 HAS TCASII RA DURING A VISUAL APCH INTO ATL, GA.

Narrative: WHILE ON VISUAL APCH TO RWY 26R IN ATL, DSNDING AS CLRED FROM 5000 FT TO 4000 FT, GOT TCASII RA TO DSND. TARGET ACFT SHOWED 200 FT BELOW AND CLBING AT 11 O'CLOCK POS. SUBJECT ACFT WAS VISUALLY IDENTED TO BE AN ACR BRASILIA IN A L TURN AT APPROX 4500 FT. SUBJECT ACFT PASSED OFF R SIDE CO-ALT AT APPROX 1 1/2 MI. DSCNT TO 4000 FT WAS CONTINUED AND NO OTHER ACTION WAS NECESSARY. FO WAS FLYING ACFT AND BOTH PLTS VISUALLY IDENTED TARGET ACFT.

Data retrieved from NASA's ASRS site as of July 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.