Air carrier crossed in front of another air carrier while on downwind.

Attributes
ACN	116936
Time
Date	198907
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 8300 msl bound upper : 10000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw artcc : zan
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time total : 11000
ASRS Report	116936
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 6000 vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

On downwind for runway 35R at dfw at approximately 8300' we spotted air carrier Y slightly above and to our right and ahead about 1 mi. The controller then vectored air carrier Y on a left descending turn across our flight path. No advisory was ever given to us of traffic and not until after we mentioned to the controller that we were concerned about our separation did he give us a 10 degree right turn. We lost sight of traffic ahead behind a cloud. Less than standard separation.

Original NASA ASRS Text

Title: ACR CROSSED IN FRONT OF ANOTHER ACR WHILE ON DOWNWIND.

Narrative: ON DOWNWIND FOR RWY 35R AT DFW AT APPROX 8300' WE SPOTTED ACR Y SLIGHTLY ABOVE AND TO OUR RIGHT AND AHEAD ABOUT 1 MI. THE CTLR THEN VECTORED ACR Y ON A LEFT DESCENDING TURN ACROSS OUR FLT PATH. NO ADVISORY WAS EVER GIVEN TO US OF TFC AND NOT UNTIL AFTER WE MENTIONED TO THE CTLR THAT WE WERE CONCERNED ABOUT OUR SEPARATION DID HE GIVE US A 10 DEG RIGHT TURN. WE LOST SIGHT OF TFC AHEAD BEHIND A CLOUD. LESS THAN STANDARD SEPARATION.

Data retrieved from NASA's ASRS site as of August 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.