Less than standard separation between 2 aircraft being vectored toward dwf by ZFW.

Attributes
ACN	113302
Time
Date	198906
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lub airport : dfw
State Reference	TX
Altitude	msl bound lower : 28000 msl bound upper : 28000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw tower : den
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 120 flight time total : 6500
ASRS Report	113302
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : unspecified other controllera
Resolutory Action	controller : issued new clearance
Consequence	Other
Miss Distance	horizontal : 24000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

We were in route from ont to dfw on a scheduled flight. Due to thunderstorms in the dfw area, ATC told us to fly from wink VOR to guthry VOR in order to delay our arrival at dfw. We were given a vector of 040 degree until receiving guthry VOR. While in route to guthry the controller issued a new heading to 020 degree in order to delay our arrival at guthry VOR. We were then handed over to the next controller. We checked in with the new controller at FL280. After flying on the assigned heading of 020 degree for approximately 10 mins the controller gave us an immediate turn to 140 degree and an immediate descent first officer FL270. He gave another aircraft a turn to a southerly heading and an immediate climb to FL310. Although the controller did not say anything else to us in regard to this situation, I assume he received a traffic conflict alert. In my opinion, the controller who gave us the assigned heading of 020 degree did not advise the next controller of the new heading. As a result, this controller was required to give us an immediate turn and altitude change in order to avoid a traffic conflict.

Original NASA ASRS Text

Title: LESS THAN STANDARD SEPARATION BETWEEN 2 ACFT BEING VECTORED TOWARD DWF BY ZFW.

Narrative: WE WERE IN ROUTE FROM ONT TO DFW ON A SCHEDULED FLT. DUE TO TSTMS IN THE DFW AREA, ATC TOLD US TO FLY FROM WINK VOR TO GUTHRY VOR IN ORDER TO DELAY OUR ARR AT DFW. WE WERE GIVEN A VECTOR OF 040 DEG UNTIL RECEIVING GUTHRY VOR. WHILE IN ROUTE TO GUTHRY THE CTLR ISSUED A NEW HDG TO 020 DEG IN ORDER TO DELAY OUR ARR AT GUTHRY VOR. WE WERE THEN HANDED OVER TO THE NEXT CTLR. WE CHECKED IN WITH THE NEW CTLR AT FL280. AFTER FLYING ON THE ASSIGNED HDG OF 020 DEG FOR APPROX 10 MINS THE CTLR GAVE US AN IMMEDIATE TURN TO 140 DEG AND AN IMMEDIATE DSCNT FO FL270. HE GAVE ANOTHER ACFT A TURN TO A SOUTHERLY HDG AND AN IMMEDIATE CLIMB TO FL310. ALTHOUGH THE CTLR DID NOT SAY ANYTHING ELSE TO US IN REGARD TO THIS SITUATION, I ASSUME HE RECEIVED A TFC CONFLICT ALERT. IN MY OPINION, THE CTLR WHO GAVE US THE ASSIGNED HDG OF 020 DEG DID NOT ADVISE THE NEXT CTLR OF THE NEW HDG. AS A RESULT, THIS CTLR WAS REQUIRED TO GIVE US AN IMMEDIATE TURN AND ALT CHANGE IN ORDER TO AVOID A TFC CONFLICT.

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.