An approach controller and air carrier flight crew reported a near mid air collision due to poor ATC...

Attributes
ACN	1499027
Time
Date	201711
Local Time Of Day	1801-2400
Place
Locale Reference	DFW.Airport
State Reference	TX
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport Low Wing 2 Turboprop Eng
Flight Phase	Initial Climb
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Developmental
Person 2
Function	Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Conflict NMAC Deviation - Procedural Published Material / Policy

Narrative:

Working arrival radar. A tower requests a release from gky airport; 270 heading and climbing to 3;000. I approve it. The aircraft finally departs five minutes and some number of seconds later; at which point I forgot about the release. I was under the impression that type of coordination is only good for 3 minutes. The aircraft departing climbs westbound into the flight path of the arriving [large transport]. They got about 700 feet vertically and then the [large transport] responded to a TCAS RA.well; the stale coordination was obviously a factor. But I also will probably not approve any releases climbing to 3;000 in the future. I will only approve climbing to 2;000 at least when I am that busy. Also it wasn't that I was that busy; but the fact that it was three runways worth of arrivals to dfw so I was pushing all my base traffic down as soon as possible to help the other sector get their traffic down and in.

Original NASA ASRS Text

Title: An Approach Controller and air carrier flight crew reported a near mid air collision due to poor ATC coordination on a departure from a satellite airport.

Narrative: Working Arrival Radar. A Tower requests a release from GKY airport; 270 heading and climbing to 3;000. I approve it. The aircraft finally departs five minutes and some number of seconds later; at which point I forgot about the release. I was under the impression that type of coordination is only good for 3 minutes. The aircraft departing climbs westbound into the flight path of the arriving [large transport]. They got about 700 feet vertically and then the [large transport] responded to a TCAS RA.Well; the stale coordination was obviously a factor. But I also will probably not approve any releases climbing to 3;000 in the future. I will only approve climbing to 2;000 at least when I am that busy. Also it wasn't that I was that busy; but the fact that it was three runways worth of arrivals to DFW so I was pushing all my base traffic down ASAP to help the other sector get their traffic down and in.

Data retrieved from NASA's ASRS site 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.

An approach controller and air carrier flight crew reported a near mid air collision due to poor ATC coordination on a departure from a satellite airport.