With apparent loss of legal separation, ARTCC radar controller immediately descended this part 121 air carrier from FL330 to FL310 just prior to receiving TCASII traffic alert.

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Attributes
ACN	422577
Time
Date	199812
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pxv
State Reference	IN
Altitude	msl bound lower : 31800 msl bound upper : 31800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz
Operator	common carrier : air carrier
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 160 flight time total : 17000 flight time type : 7500
ASRS Report	422577
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified other controllera other flight crewa
Resolutory Action	other other
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

Cleared from FL310 to FL330 by ZID. At FL318 ARTCC told us to descend to FL310 immediately and turn hard right to 270 degrees. There was obvious concern in his voice and we aggressively complied. About 3 seconds later the TCASII gave us 'traffic.' we acquired the aircraft visually slightly to our right at FL330. The ATC controller made a mistake but took aggressive corrective action. TCASII was a help in acquiring the traffic. It also helped that it was daytime and VMC clear and sunny.

Original NASA ASRS Text

Title: WITH APPARENT LOSS OF LEGAL SEPARATION, ARTCC RADAR CTLR IMMEDIATELY DSNDED THIS PART 121 ACR FROM FL330 TO FL310 JUST PRIOR TO RECEIVING TCASII TFC ALERT.

Narrative: CLRED FROM FL310 TO FL330 BY ZID. AT FL318 ARTCC TOLD US TO DSND TO FL310 IMMEDIATELY AND TURN HARD R TO 270 DEGS. THERE WAS OBVIOUS CONCERN IN HIS VOICE AND WE AGGRESSIVELY COMPLIED. ABOUT 3 SECONDS LATER THE TCASII GAVE US 'TFC.' WE ACQUIRED THE ACFT VISUALLY SLIGHTLY TO OUR R AT FL330. THE ATC CTLR MADE A MISTAKE BUT TOOK AGGRESSIVE CORRECTIVE ACTION. TCASII WAS A HELP IN ACQUIRING THE TFC. IT ALSO HELPED THAT IT WAS DAYTIME AND VMC CLR AND SUNNY.

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.