Air carrier X has less than standard separation from air carrier Y. System error. TCASII RA descent from assigned altitude non adherence to ATC clearance evasive action taken.

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Attributes
ACN	185253
Time
Date	199107
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : gso
State Reference	NC
Altitude	msl bound lower : 29500 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjx artcc : zmp
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
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 : 100 flight time total : 12000 flight time type : 7000
ASRS Report	185253
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 225 flight time total : 8500 flight time type : 1200
ASRS Report	184945
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X in cruise ATC advised to turn 80 degrees to the right. Immediately TCAS commanded 'descend.' in turn I descended from 310 to 29.5. TCAS became silent. ATC shortly cleared us back to 310 and direct to greensboro and on course. They confirmed air carrier Y in the area. TCAS worked as advertised. Center confirmed his alarm also sounded.

Original NASA ASRS Text

Title: ACR X HAS LTSS FROM ACR Y. SYS ERROR. TCASII RA DSCNT FROM ASSIGNED ALT NON ADHERENCE TO ATC CLRNC EVASIVE ACTION TAKEN.

Narrative: ACR X IN CRUISE ATC ADVISED TO TURN 80 DEGS TO THE R. IMMEDIATELY TCAS COMMANDED 'DSND.' IN TURN I DSNDED FROM 310 TO 29.5. TCAS BECAME SILENT. ATC SHORTLY CLRED US BACK TO 310 AND DIRECT TO GREENSBORO AND ON COURSE. THEY CONFIRMED ACR Y IN THE AREA. TCAS WORKED AS ADVERTISED. CENTER CONFIRMED HIS ALARM ALSO SOUNDED.

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.