A potential conflict bordering upon an near midair collision is avoided when an MD88 flight crew is alerted by their TCASII of a VFR aircraft on a collision course within the class B of atl, GA.

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Attributes
ACN	465232
Time
Date	200003
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	msl bound lower : 4500 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl.tracon tower : iad.tower
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : vacating altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : atl.tracon
Make Model Name	Small Aircraft, Low Wing, 2 Eng, Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 224 flight time total : 9583 flight time type : 5135
ASRS Report	465232
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne critical non adherence : far non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action
Miss Distance	horizontal : 0 vertical : 600
Supplementary
Problem Areas	Airspace Structure ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance

Narrative:

Climb out out of atl to 10000 ft on assigned heading of 270 degrees, we got a TCASII warning at 4500 ft of a traffic conflict. The yellow diamond symbol turned red and issued a command to descend. I discontinued the climb out and instructed the first officer to advise ATC of our actions due to a TCASII resolution. Simultaneously, we got a visual of a light twin propeller as ATC instructed us to maintain 5000 ft and advised us of VFR traffic at 1 O'clock at 5500 ft. The aircraft passed 600 ft above our altitude (TCASII readout) and I estimate directly overhead. TCASII has not been around for all that long, but the folks who invented it certainly have my deepest appreciation.

Original NASA ASRS Text

Title: A POTENTIAL CONFLICT BORDERING UPON AN NMAC IS AVOIDED WHEN AN MD88 FLC IS ALERTED BY THEIR TCASII OF A VFR ACFT ON A COLLISION COURSE WITHIN THE CLASS B OF ATL, GA.

Narrative: CLBOUT OUT OF ATL TO 10000 FT ON ASSIGNED HDG OF 270 DEGS, WE GOT A TCASII WARNING AT 4500 FT OF A TFC CONFLICT. THE YELLOW DIAMOND SYMBOL TURNED RED AND ISSUED A COMMAND TO DSND. I DISCONTINUED THE CLBOUT AND INSTRUCTED THE FO TO ADVISE ATC OF OUR ACTIONS DUE TO A TCASII RESOLUTION. SIMULTANEOUSLY, WE GOT A VISUAL OF A LIGHT TWIN PROP AS ATC INSTRUCTED US TO MAINTAIN 5000 FT AND ADVISED US OF VFR TFC AT 1 O'CLOCK AT 5500 FT. THE ACFT PASSED 600 FT ABOVE OUR ALT (TCASII READOUT) AND I ESTIMATE DIRECTLY OVERHEAD. TCASII HAS NOT BEEN AROUND FOR ALL THAT LONG, BUT THE FOLKS WHO INVENTED IT CERTAINLY HAVE MY DEEPEST APPRECIATION.

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.