Loss of separation discovered by TCASII and controller in atlanta airspace.

Attributes
ACN	476319
Time
Date	200006
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : vxv.vortac
State Reference	GA
Altitude	msl single value : 31000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : ztl.artcc
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : ztl.artcc
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : atp pilot : cfi
Experience	flight time last 90 days : 240 flight time total : 6000 flight time type : 600
ASRS Report	476319
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment : tcas other controllerb
Resolutory Action	controller : separated traffic controller : issued new clearance flight crew : took evasive action
Miss Distance	horizontal : 18000
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Level at FL310, received TA which progressed to an RA. Traffic (air carrier) was approaching head-on at same altitude. TCASII issued a descent followed by ATC issuing an immediate left turn. I complied with both. Oncoming aircraft appeared to veer to his left and missed by approximately 3 mi. ZTL was controller and the incident appeared to be controller error.

Original NASA ASRS Text

Title: LOSS OF SEPARATION DISCOVERED BY TCASII AND CTLR IN ATLANTA AIRSPACE.

Narrative: LEVEL AT FL310, RECEIVED TA WHICH PROGRESSED TO AN RA. TFC (ACR) WAS APCHING HEAD-ON AT SAME ALT. TCASII ISSUED A DSCNT FOLLOWED BY ATC ISSUING AN IMMEDIATE L TURN. I COMPLIED WITH BOTH. ONCOMING ACFT APPEARED TO VEER TO HIS L AND MISSED BY APPROX 3 MI. ZTL WAS CTLR AND THE INCIDENT APPEARED TO BE CTLR ERROR.

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.