D10 controller assuming a descent clearance was acknowledged, experienced an operational error at 4000 ft, immediately after accepting the control position.

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Attributes
ACN	632806
Time
Date	200409
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : fuz.vortac
State Reference	TX
Altitude	msl single value : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	SF 340A
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d10.tracon
Operator	general aviation : personal
Make Model Name	Baron 55/Cochise
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Route In Use	arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller radar : 21
ASRS Report	632806
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 7000 vertical : 500
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was just accepting the control position from the previous controller. I had heard the previous controller instruct the BE55 'no delay down to 3000 ft.' I attempted to hand off a third aircraft that was unrelated to this incident to an adjacent facility. I then looked at the BE55 and the SF34 and saw that they were on converging course both at 4000 ft. I issued turns to both aircraft. The SF34 reported the BE55 in sight and I instructed him to 'maintain visual separation.' separation was already lost.

Original NASA ASRS Text

Title: D10 CTLR ASSUMING A DSCNT CLRNC WAS ACKNOWLEDGED, EXPERIENCED AN OPERROR AT 4000 FT, IMMEDIATELY AFTER ACCEPTING THE CTL POS.

Narrative: I WAS JUST ACCEPTING THE CTL POS FROM THE PREVIOUS CTLR. I HAD HEARD THE PREVIOUS CTLR INSTRUCT THE BE55 'NO DELAY DOWN TO 3000 FT.' I ATTEMPTED TO HAND OFF A THIRD ACFT THAT WAS UNRELATED TO THIS INCIDENT TO AN ADJACENT FACILITY. I THEN LOOKED AT THE BE55 AND THE SF34 AND SAW THAT THEY WERE ON CONVERGING COURSE BOTH AT 4000 FT. I ISSUED TURNS TO BOTH ACFT. THE SF34 RPTED THE BE55 IN SIGHT AND I INSTRUCTED HIM TO 'MAINTAIN VISUAL SEPARATION.' SEPARATION WAS ALREADY LOST.

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.