Air carrier medium large transport is cleared to descend ot 10000' during arrival at dfw, but approach controller stops descent at 12000' due to conflicting traffic. Medium large transport had just been handed off from center to approach.

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Attributes
ACN	154099
Time
Date	199008
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : scy airport : dfw
State Reference	TX
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zfw tracon : dfw tower : stl
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	other vortac
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 3750 flight time type : 200
ASRS Report	154099
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error Inter Facility Coordination Failure

Narrative:

We were given a very late clearance to cross seago (scy 296/18 DME) at 11000'. When asked if we could do that, we replied that we would do our best. When passing through approximately 13000' we were handed off to the next controller. At approximately 12000' in a high rate of descent, the controller very urgently requested we level off at 12000'. Immediate action was taken to stop the descent and return to 12000'. We then saw an aircraft that appeared to be at 11000' and 1 mi away.

Original NASA ASRS Text

Title: ACR MLG IS CLEARED TO DESCEND OT 10000' DURING ARR AT DFW, BUT APCH CTLR STOPS DESCENT AT 12000' DUE TO CONFLICTING TRAFFIC. MLG HAD JUST BEEN HANDED OFF FROM CENTER TO APCH.

Narrative: WE WERE GIVEN A VERY LATE CLRNC TO CROSS SEAGO (SCY 296/18 DME) AT 11000'. WHEN ASKED IF WE COULD DO THAT, WE REPLIED THAT WE WOULD DO OUR BEST. WHEN PASSING THROUGH APPROX 13000' WE WERE HANDED OFF TO THE NEXT CTLR. AT APPROX 12000' IN A HIGH RATE OF DSNT, THE CTLR VERY URGENTLY REQUESTED WE LEVEL OFF AT 12000'. IMMEDIATE ACTION WAS TAKEN TO STOP THE DSNT AND RETURN TO 12000'. WE THEN SAW AN ACFT THAT APPEARED TO BE AT 11000' AND 1 MI AWAY.

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.