Air carrier at cruise has TCASII RA to descend. Does so.

Attributes
ACN	213009
Time
Date	199206
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : shv
State Reference	LA
Altitude	msl bound lower : 27800 msl bound upper : 28000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zme
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
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 : 17350 flight time type : 10380
ASRS Report	213009
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 210 flight time total : 5900 flight time type : 800
ASRS Report	213384
Events
Anomaly	altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

In cruise at FL280, we got 'descend' instructions on TCASII. Called center to advise and initiated descent at same time; also at about same time got traffic in visual contact. As we reached 27800 ft center advised us to return to FL280 and that traffic was at FL290. We did so.

Original NASA ASRS Text

Title: ACR AT CRUISE HAS TCASII RA TO DSND. DOES SO.

Narrative: IN CRUISE AT FL280, WE GOT 'DSND' INSTRUCTIONS ON TCASII. CALLED CTR TO ADVISE AND INITIATED DSCNT AT SAME TIME; ALSO AT ABOUT SAME TIME GOT TFC IN VISUAL CONTACT. AS WE REACHED 27800 FT CTR ADVISED US TO RETURN TO FL280 AND THAT TFC WAS AT FL290. WE DID SO.

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.