Air carrier descended below assigned altitude in response to TCASII alert.

Attributes
ACN	180621
Time
Date	199106
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 10650 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other cruise other descent : approach
Route In Use	arrival star : star
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 210 flight time total : 8000 flight time type : 2200
ASRS Report	180621
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Approaching dfw on scurry arrival, 210 KTS, the TCAS issued right/a instructing to descend. We descended 350 ft at that time the TCAS instructed to climb back to level flight as traffic was clear. We reported descent to dfw approach control. They advised that was climbing through our altitude VFR. We questioned the controller about not being advised of the traffic. He said that by the time was handed off to departure and the information relayed to him there was no time. Passed at our 6 O'clock position about 1/2 mi.

Original NASA ASRS Text

Title: ACR DSNDED BELOW ASSIGNED ALT IN RESPONSE TO TCASII ALERT.

Narrative: APCHING DFW ON SCURRY ARR, 210 KTS, THE TCAS ISSUED R/A INSTRUCTING TO DSND. WE DSNDED 350 FT AT THAT TIME THE TCAS INSTRUCTED TO CLB BACK TO LEVEL FLT AS TFC WAS CLR. WE RPTED DSCNT TO DFW APCH CTL. THEY ADVISED THAT WAS CLBING THROUGH OUR ALT VFR. WE QUESTIONED THE CTLR ABOUT NOT BEING ADVISED OF THE TFC. HE SAID THAT BY THE TIME WAS HANDED OFF TO DEP AND THE INFO RELAYED TO HIM THERE WAS NO TIME. PASSED AT OUR 6 O'CLOCK POS ABOUT 1/2 MI.

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.