An air carrier medium large transport climbed in response to a TCASII command.

Attributes
ACN	230087
Time
Date	199301
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : bpr airport : dfw
State Reference	TX
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 225 flight time total : 13100 flight time type : 2500
ASRS Report	230087
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 2000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While inbound to dfw on arrival STAR, a TCASII TA sounded. I looked at TCASII display to see intruder amber signal at 12:30 and 4 NM ahead. I looked outside to locate target but could not see it due to undercast below. I continued to scan TCASII display and outside aircraft to locate intruder. Finally I received a TCASII RA with visual and aural commands to climb. I immediately climbed out of 11000 ft MSL to satisfy TCASII climb command of at least 1500 FPM. I leveled aircraft at 12000 ft MSL when clear of conflict signal was sounded by TCASII. My first officer notified ATC during the climb about our altitude deviation in response to TCASII. I then began a descent to the original altitude clearance of 11000 ft MSL. At no time did my crew visually detect the intruder traffic that caused the TCASII RA.

Original NASA ASRS Text

Title: AN ACR MLG CLBED IN RESPONSE TO A TCASII COMMAND.

Narrative: WHILE INBOUND TO DFW ON ARR STAR, A TCASII TA SOUNDED. I LOOKED AT TCASII DISPLAY TO SEE INTRUDER AMBER SIGNAL AT 12:30 AND 4 NM AHEAD. I LOOKED OUTSIDE TO LOCATE TARGET BUT COULD NOT SEE IT DUE TO UNDERCAST BELOW. I CONTINUED TO SCAN TCASII DISPLAY AND OUTSIDE ACFT TO LOCATE INTRUDER. FINALLY I RECEIVED A TCASII RA WITH VISUAL AND AURAL COMMANDS TO CLB. I IMMEDIATELY CLBED OUT OF 11000 FT MSL TO SATISFY TCASII CLB COMMAND OF AT LEAST 1500 FPM. I LEVELED ACFT AT 12000 FT MSL WHEN CLR OF CONFLICT SIGNAL WAS SOUNDED BY TCASII. MY FO NOTIFIED ATC DURING THE CLB ABOUT OUR ALTDEV IN RESPONSE TO TCASII. I THEN BEGAN A DSCNT TO THE ORIGINAL ALT CLRNC OF 11000 FT MSL. AT NO TIME DID MY CREW VISUALLY DETECT THE INTRUDER TFC THAT CAUSED THE TCASII RA.

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.