D10 controller described a loss of separation event when issuing an intercept heading during simulta...

Narrative:

Air carrier Y; was a dfw arrival from the northeast. Air carrier Y was vectored at 5;000 ft for the ILS runway 17L by arrival radar 1 (AR1). Five miles northeast of rivet (trip fix) air carrier Y was assigned heading 200 to intercept the localizer and was cleared for approach. This placed air carrier Y on a course to intercept the localizer 2 miles outside of rivet. AR1 instructed air carrier Y to contact dfw tower 2.5 miles outside rivet prior to air carrier Y being established on final approach course. Air carrier Y went through the final prior to the trip fix during the turn to join the localizer. Final monitor 1 (FM1) informed air carrier Y that they were right of the localizer and instructed air carrier Y to turn 10 degrees left to intercept the final. The operational error occurred when air carrier Y penetrated the ntz prior to returning to the runway 17L localizer. This resulted in a loss of separation with a B737; descending on the ILS runway 17C. Recommendation; prior to this; I had to break another guy out because he was about to penetrate the ntz; I should have broken out air carrier Y when he penetrated the ntz and not given him 10 degrees left to intercept.

Original NASA ASRS Text

Title: D10 Controller described a loss of separation event when issuing an intercept heading during simultaneous approach procedures in lieu of a go around when the aircraft entered the NTZ.

Narrative: Air Carrier Y; was a DFW arrival from the northeast. Air Carrier Y was vectored at 5;000 FT for the ILS Runway 17L by Arrival Radar 1 (AR1). Five miles northeast of RIVET (TRIP fix) Air Carrier Y was assigned heading 200 to intercept the localizer and was cleared for approach. This placed Air Carrier Y on a course to intercept the localizer 2 miles outside of RIVET. AR1 instructed Air Carrier Y to contact DFW Tower 2.5 miles outside RIVET prior to Air Carrier Y being established on final approach course. Air Carrier Y went through the final prior to the TRIP fix during the turn to join the localizer. Final Monitor 1 (FM1) informed Air Carrier Y that they were right of the localizer and instructed Air Carrier Y to turn 10 degrees left to intercept the final. The Operational Error occurred when Air Carrier Y penetrated the NTZ prior to returning to the Runway 17L localizer. This resulted in a loss of separation with a B737; descending on the ILS Runway 17C. Recommendation; Prior to this; I had to break another guy out because he was about to penetrate the NTZ; I should have broken out Air Carrier Y when he penetrated the NTZ and not given him 10 degrees left to intercept.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	985432
Time
Date	201112
Local Time Of Day	1801-2400
Place
Locale Reference	D10.TRACON
State Reference	TX
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Medium Transport High Wing 2 Turboprop Eng
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Function	Approach Departure
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy

D10 controller described a loss of separation event when issuing an intercept heading during simultaneous approach procedures in lieu of a go around when the aircraft entered the ntz.