Air carrier has TCASII TA then RA. Responds.

Attributes
ACN	230385
Time
Date	199212
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : aqn airport : dfw
State Reference	TX
Altitude	msl bound lower : 5000 msl bound upper : 6800
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tower : iad
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent other
Route In Use	arrival other enroute airway : dfw
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Military Trainer
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 130 flight time total : 15000 flight time type : 6000
ASRS Report	230385
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 210 flight time total : 18000 flight time type : 1500
ASRS Report	229021
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 6000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Handed off to dfw approach control at 9000 ft. Given 060 degree heading descent to 5000 ft. TCASII warnings progressed rapidly, starting with TA at 11 O'clock position. Still had radar display on, so not as clear a display of traffic. Only altitude difference I specifically remember was 2500 ft on climbing target. Quickly changed to RA as TCASII ordered stop of descent. Turned off 'WX' and selected TCASII display and 10 mi scale. TCASII directed climb. Captain flying, complied with TCASII commands. Conflict quickly resolved due to our climb, target passing 1-2 mi abeam, and probable corrective action by target. Asked approach control if had the traffic and advised that we had made TCASII deviation. Approach seemed unclr about traffic, then after pause, said it was MTR from carswell that had exceeded clearance. Captain was concerned that MTR might be maneuvering and might be in conflict again. I switched TCASII to 30 mi range to check MTR behind us. Got approach control to confirm that MTR was heading west. Approach control said traffic clear and thanked for our actions. We never saw the MTR. TCASII did its job well. Probably wouldn't have had collision without it, but commands assured separation. Approach control obviously didn't see the conflict until it was already resolved. This was very rapid incident. For best analysis, 3 changes of first officer display were required. Separate good sized TCASII display would make analysis of traffic conflict much easier without making multiple selections. Radar display also tends to mask and confuse TCASII display.

Original NASA ASRS Text

Title: ACR HAS TCASII TA THEN RA. RESPONDS.

Narrative: HANDED OFF TO DFW APCH CTL AT 9000 FT. GIVEN 060 DEG HDG DSCNT TO 5000 FT. TCASII WARNINGS PROGRESSED RAPIDLY, STARTING WITH TA AT 11 O'CLOCK POS. STILL HAD RADAR DISPLAY ON, SO NOT AS CLR A DISPLAY OF TFC. ONLY ALT DIFFERENCE I SPECIFICALLY REMEMBER WAS 2500 FT ON CLBING TARGET. QUICKLY CHANGED TO RA AS TCASII ORDERED STOP OF DSCNT. TURNED OFF 'WX' AND SELECTED TCASII DISPLAY AND 10 MI SCALE. TCASII DIRECTED CLB. CAPT FLYING, COMPLIED WITH TCASII COMMANDS. CONFLICT QUICKLY RESOLVED DUE TO OUR CLB, TARGET PASSING 1-2 MI ABEAM, AND PROBABLE CORRECTIVE ACTION BY TARGET. ASKED APCH CTL IF HAD THE TFC AND ADVISED THAT WE HAD MADE TCASII DEV. APCH SEEMED UNCLR ABOUT TFC, THEN AFTER PAUSE, SAID IT WAS MTR FROM CARSWELL THAT HAD EXCEEDED CLRNC. CAPT WAS CONCERNED THAT MTR MIGHT BE MANEUVERING AND MIGHT BE IN CONFLICT AGAIN. I SWITCHED TCASII TO 30 MI RANGE TO CHK MTR BEHIND US. GOT APCH CTL TO CONFIRM THAT MTR WAS HDG W. APCH CTL SAID TFC CLR AND THANKED FOR OUR ACTIONS. WE NEVER SAW THE MTR. TCASII DID ITS JOB WELL. PROBABLY WOULDN'T HAVE HAD COLLISION WITHOUT IT, BUT COMMANDS ASSURED SEPARATION. APCH CTL OBVIOUSLY DIDN'T SEE THE CONFLICT UNTIL IT WAS ALREADY RESOLVED. THIS WAS VERY RAPID INCIDENT. FOR BEST ANALYSIS, 3 CHANGES OF FO DISPLAY WERE REQUIRED. SEPARATE GOOD SIZED TCASII DISPLAY WOULD MAKE ANALYSIS OF TFC CONFLICT MUCH EASIER WITHOUT MAKING MULTIPLE SELECTIONS. RADAR DISPLAY ALSO TENDS TO MASK AND CONFUSE TCASII DISPLAY.

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.