Air carrier has TCASII RA to climb. Responds.

Attributes
ACN	225644
Time
Date	199211
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : den
State Reference	CO
Altitude	msl bound lower : 11000 msl bound upper : 11300
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : den
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : flight engineer pilot : instrument pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 3000 flight time type : 1000
ASRS Report	225644
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 1000
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

We were level at 11000 MSL, just east of denver, and were being radar vectored into stapleton. We received a TCASII TA followed soon thereafter by an RA to 'climb.' since we didn't have visual contact with the traffic, we complied and initiated a climb. I immediately reported to denver that we were initiating a climb due to a TCASII RA. They said that there was no conflict, and that we should return to 11000 ft. We reached a maximum of 200-300 ft above 11000 ft. We never saw the traffic. I think center should have told us of the impending conflict so we could have been better prepared. Also, I think TCASII needs to be polished up a little so these events don't occur so much.

Original NASA ASRS Text

Title: ACR HAS TCASII RA TO CLB. RESPONDS.

Narrative: WE WERE LEVEL AT 11000 MSL, JUST E OF DENVER, AND WERE BEING RADAR VECTORED INTO STAPLETON. WE RECEIVED A TCASII TA FOLLOWED SOON THEREAFTER BY AN RA TO 'CLB.' SINCE WE DIDN'T HAVE VISUAL CONTACT WITH THE TFC, WE COMPLIED AND INITIATED A CLB. I IMMEDIATELY RPTED TO DENVER THAT WE WERE INITIATING A CLB DUE TO A TCASII RA. THEY SAID THAT THERE WAS NO CONFLICT, AND THAT WE SHOULD RETURN TO 11000 FT. WE REACHED A MAX OF 200-300 FT ABOVE 11000 FT. WE NEVER SAW THE TFC. I THINK CTR SHOULD HAVE TOLD US OF THE IMPENDING CONFLICT SO WE COULD HAVE BEEN BETTER PREPARED. ALSO, I THINK TCASII NEEDS TO BE POLISHED UP A LITTLE SO THESE EVENTS DON'T OCCUR SO MUCH.

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.