Air carrier has TCASII RA. Responds with climb.

Attributes
ACN	198990
Time
Date	199201
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	agl single value : 1250 msl bound lower : 1 msl bound upper : 10001
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : dfw tower : mgm
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
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 : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 125 flight time total : 4500
ASRS Report	198990
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument 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
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 6000 vertical : 700
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

On the scurry arrival into dfw, (surry 296 degree radial 33 DME 11000 ft MSL altitude 30.12 210 KTS IAS). We received a TCASII resolution to 'climb, climb.' traffic on TCASII indicated approximately 1 mi 12 O'clock position 700 ft below us and climbing. We initiated an immediate climb. At the same time I called approach and asked if he showed any traffic for us. He said we had traffic below us a thousand ft (we did not see the traffic visually). At 11200 ft the resolution ceased and we returned to 11000 ft never getting higher then 11250 ft. We never had a TCASII advisory ie, 'traffic, traffic' before we received the resolution to 'climb'. Approach gave us a frequency change so we never had a chance to discuss the situation with him. Our TCASII was operating normally previous to this occurrence and continued to do so. Opinion: the aircraft below us may have overshot his assigned altitude causing the resolution or the TCASII indication was a false one.

Original NASA ASRS Text

Title: ACR HAS TCASII RA. RESPONDS WITH CLB.

Narrative: ON THE SCURRY ARR INTO DFW, (SURRY 296 DEG RADIAL 33 DME 11000 FT MSL ALT 30.12 210 KTS IAS). WE RECEIVED A TCASII RESOLUTION TO 'CLB, CLB.' TFC ON TCASII INDICATED APPROX 1 MI 12 O'CLOCK POS 700 FT BELOW US AND CLBING. WE INITIATED AN IMMEDIATE CLB. AT THE SAME TIME I CALLED APCH AND ASKED IF HE SHOWED ANY TFC FOR US. HE SAID WE HAD TFC BELOW US A THOUSAND FT (WE DID NOT SEE THE TFC VISUALLY). AT 11200 FT THE RESOLUTION CEASED AND WE RETURNED TO 11000 FT NEVER GETTING HIGHER THEN 11250 FT. WE NEVER HAD A TCASII ADVISORY IE, 'TFC, TFC' BEFORE WE RECEIVED THE RESOLUTION TO 'CLB'. APCH GAVE US A FREQ CHANGE SO WE NEVER HAD A CHANCE TO DISCUSS THE SITUATION WITH HIM. OUR TCASII WAS OPERATING NORMALLY PREVIOUS TO THIS OCCURRENCE AND CONTINUED TO DO SO. OPINION: THE ACFT BELOW US MAY HAVE OVERSHOT HIS ASSIGNED ALT CAUSING THE RESOLUTION OR THE TCASII INDICATION WAS A FALSE ONE.

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.