B727 maintaining FL270 TCASII to descend. Descended to FL255 to clear alert. Other aircraft received TCASII alert to climb. Center was having problems with their computer.

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Attributes
ACN	364192
Time
Date	199703
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : rod
State Reference	OH
Altitude	msl bound lower : 27000 msl bound upper : 27000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 11000 flight time type : 2500
ASRS Report	364192
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error other
Situations
ATC Facility	other physical facility

Narrative:

Cruising eastbound at FL270 in the vicinity of rod VOR, the TCASII issued an RA and called for a descent. We leveled at approximately FL255 and initiated a climb back to FL270. The other aircraft was also issued a TCASII RA instructing a climb. Vertical separation is unknown. A computer outage at ZID appears to be a contributing factor.

Original NASA ASRS Text

Title: B727 MAINTAINING FL270 TCASII TO DSND. DSNDED TO FL255 TO CLR ALERT. OTHER ACFT RECEIVED TCASII ALERT TO CLB. CTR WAS HAVING PROBS WITH THEIR COMPUTER.

Narrative: CRUISING EBOUND AT FL270 IN THE VICINITY OF ROD VOR, THE TCASII ISSUED AN RA AND CALLED FOR A DSCNT. WE LEVELED AT APPROX FL255 AND INITIATED A CLB BACK TO FL270. THE OTHER ACFT WAS ALSO ISSUED A TCASII RA INSTRUCTING A CLB. VERT SEPARATION IS UNKNOWN. A COMPUTER OUTAGE AT ZID APPEARS TO BE A CONTRIBUTING FACTOR.

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.