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

Attributes
ACN	253868
Time
Date	199310
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 3000 msl bound upper : 3600
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
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 descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 7000 flight time type : 2500
ASRS Report	253868
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 3000 flight time type : 300
ASRS Report	254216
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 : returned to intended course or assigned course flight crew : took evasive action other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

On localizer to ILS runway 36L at dfw. Before intercepting GS at 3000 ft, approximately 15 mi out, received an RA to climb on TCASII. We were in the clouds. Climbed approximately 600 ft until 'clear' of conflict was annunciated. TCASII showed traffic approximately 1-2 mi ahead at our altitude. After advising ATC, we returned to 3000 ft and overshot altitude, then resumed approach. Altitude was overshot in the confusion because altitude alert became unarmed. Supplemental information from acn 254216: ATC advised no traffic in that area at that time and I believe it was a false indication. However, being IMC, corrective action was taken.

Original NASA ASRS Text

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

Narrative: ON LOC TO ILS RWY 36L AT DFW. BEFORE INTERCEPTING GS AT 3000 FT, APPROX 15 MI OUT, RECEIVED AN RA TO CLB ON TCASII. WE WERE IN THE CLOUDS. CLBED APPROX 600 FT UNTIL 'CLR' OF CONFLICT WAS ANNUNCIATED. TCASII SHOWED TFC APPROX 1-2 MI AHEAD AT OUR ALT. AFTER ADVISING ATC, WE RETURNED TO 3000 FT AND OVERSHOT ALT, THEN RESUMED APCH. ALT WAS OVERSHOT IN THE CONFUSION BECAUSE ALT ALERT BECAME UNARMED. SUPPLEMENTAL INFORMATION FROM ACN 254216: ATC ADVISED NO TFC IN THAT AREA AT THAT TIME AND I BELIEVE IT WAS A FALSE INDICATION. HOWEVER, BEING IMC, CORRECTIVE ACTION WAS TAKEN.

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.