Flight was at 33000. Flight crew of large transport received TCASII RA to descend. RA cleared at 350 ft descent. ARTCC controller advised of deviation. Controller stated no traffic in area on his scope.

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Attributes
ACN	188263
Time
Date	199108
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sgf
State Reference	MO
Altitude	msl bound lower : 32600 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : zkc
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : flight engineer pilot : instrument pilot : atp
Experience	flight time last 90 days : 155 flight time total : 16650 flight time type : 11635
ASRS Report	188263
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

In cruise at FL330, with no prior TA on TCASII, we suddenly got a 'descend now' RA, with a red blip at 12 O'clock, 2 mi on TCASII. We immediately initiated a descent, although we could see no other aircraft visually (daylight, clear skies). At FL326 the TCASII screen cleared and TCASII announced 'clear of conflict'. We returned to FL330. ATC was informed of the altitude change and the reason. Controller's reply was 'I have no aircraft within 15 mi of you'.

Original NASA ASRS Text

Title: FLT WAS AT 33000. FLC OF LGT RECEIVED TCASII RA TO DSND. RA CLRED AT 350 FT DSCNT. ARTCC CTLR ADVISED OF DEV. CTLR STATED NO TFC IN AREA ON HIS SCOPE.

Narrative: IN CRUISE AT FL330, WITH NO PRIOR TA ON TCASII, WE SUDDENLY GOT A 'DSND NOW' RA, WITH A RED BLIP AT 12 O'CLOCK, 2 MI ON TCASII. WE IMMEDIATELY INITIATED A DSCNT, ALTHOUGH WE COULD SEE NO OTHER ACFT VISUALLY (DAYLIGHT, CLR SKIES). AT FL326 THE TCASII SCREEN CLRED AND TCASII ANNOUNCED 'CLR OF CONFLICT'. WE RETURNED TO FL330. ATC WAS INFORMED OF THE ALT CHANGE AND THE REASON. CTLR'S REPLY WAS 'I HAVE NO ACFT WITHIN 15 MI OF YOU'.

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.