B737 crew on ILS approach into atl encounter an sel approximately 4-5 mi outside of anval.

Attributes
ACN	603691
Time
Date	200312
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	intersection : anval
State Reference	GA
Altitude	msl single value : 3500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : a80.tracon
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : a80.tracon
Operator	general aviation : personal
Make Model Name	Small Aircraft
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp pilot : multi engine
Experience	flight time last 90 days : 210 flight time total : 11960 flight time type : 1900
ASRS Report	603691
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : nmac non adherence : published procedure
Independent Detector	atc equipment other atc equipment : radar/mode c aircraft equipment : tcas other controllera other flight crewa other flight crewb other other : 3
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure ATC Human Performance
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

On approach to runway 27L, just outside anval, received TA, followed shortly by an RA. We were on course and at 500 ft. I acquired a white high wing single engine cessna to our left side. Visual acquisition was acquired after we had climbed in response to the RA. Miss distance was 400 ft vertically, and 0 ft horizontally. We re-established on altitude after the RA. Near midair collision report filed with ATC after we landed. ATC was aware of traffic, but due to the high volume of arrival traffic, the controller didn't inform us about the cessna until I told him we were climbing in response to an RA.

Original NASA ASRS Text

Title: B737 CREW ON ILS APCH INTO ATL ENCOUNTER AN SEL APPROX 4-5 MI OUTSIDE OF ANVAL.

Narrative: ON APCH TO RWY 27L, JUST OUTSIDE ANVAL, RECEIVED TA, FOLLOWED SHORTLY BY AN RA. WE WERE ON COURSE AND AT 500 FT. I ACQUIRED A WHITE HIGH WING SINGLE ENG CESSNA TO OUR L SIDE. VISUAL ACQUISITION WAS ACQUIRED AFTER WE HAD CLBED IN RESPONSE TO THE RA. MISS DISTANCE WAS 400 FT VERTLY, AND 0 FT HORIZLY. WE RE-ESTABLISHED ON ALT AFTER THE RA. NMAC RPT FILED WITH ATC AFTER WE LANDED. ATC WAS AWARE OF TFC, BUT DUE TO THE HIGH VOLUME OF ARR TFC, THE CTLR DIDN'T INFORM US ABOUT THE CESSNA UNTIL I TOLD HIM WE WERE CLBING IN RESPONSE TO AN RA.

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.