<< >> NASA ASRS Report 297721, February 1995

Air carrier X TCASII RA same altitude assigned had less than standard separation from air carrier Y. System error. Evasive action taken.

Attributes
ACN	297721
Time
Date	199502
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bna
State Reference	TN
Altitude	msl bound lower : 33000 msl bound upper : 33500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 19200 flight time type : 9000
ASRS Report	297721
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 25800 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X approaching atl on the rome arrival, approximately 60 mi southeast of nashville VOR at FL330, we received a TCASII alert commanding us to climb. We immediately began a climb and leveled the aircraft a 33500 ft. WX at the time was solid IMC. We notified ZTL of our evasive action and were cleared back to our altitude and on course. During subsequent telephone conversations with ZTL. I was advised that we had come within 4.3 mi of opposite direction FL330 air carrier Y traffic. At this time I was informed that it was an ATC operational error on the part of ZTL

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Original NASA ASRS Text

Title: ACR X TCASII RA SAME ALT ASSIGNED HAD LTSS FROM ACR Y. SYS ERROR. EVASIVE ACTION TAKEN.

Narrative: ACR X APCHING ATL ON THE ROME ARR, APPROX 60 MI SE OF NASHVILLE VOR AT FL330, WE RECEIVED A TCASII ALERT COMMANDING US TO CLB. WE IMMEDIATELY BEGAN A CLB AND LEVELED THE ACFT A 33500 FT. WX AT THE TIME WAS SOLID IMC. WE NOTIFIED ZTL OF OUR EVASIVE ACTION AND WERE CLRED BACK TO OUR ALT AND ON COURSE. DURING SUBSEQUENT TELEPHONE CONVERSATIONS WITH ZTL. I WAS ADVISED THAT WE HAD COME WITHIN 4.3 MI OF OPPOSITE DIRECTION FL330 ACR Y TFC. AT THIS TIME I WAS INFORMED THAT IT WAS AN ATC OPERATIONAL ERROR ON THE PART OF ZTL

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.