Sct controller experienced a loss of separation event between opposite direction traffic at 4;000; l...

Narrative:

A PA28; was turned southbound off of the bur localizer for overtaking traffic a B737. A GLF4; departed lax for vny. I transmitted to the GLF4 4 miles south of the airspace boundary and found that he was not on frequency. Both aircraft were at 4;000 and converging. I instructed my assist that we needed to talk to the GLF4 and he initiated a call to the adjacent radar sector. I then issued the traffic to the PA28 at 5 miles apart. During the call my assist asked the other controller to switch that GLF4 and I told him to turn the aircraft. At 3 miles apart the PA28 reported the GLF4 in sight; I instructed the PA28 to maintain visual separation and he agreed; when that transmission ended the aircraft were less than 3 miles apart. When I finally talked to the GLF4 he was inside my airspace. Recommendation; turning the PA28 southbound off of the localizer ended up not being a very farsighted idea; by committing him to south or southwesterly heading; as opposed to southeast; I left myself no room to maneuver when the GLF4 did not check in to the frequency. Also when I advised my assist that we needed to talk to the GLF4 I should have included specific instructions to insure safety.

Original NASA ASRS Text

Title: SCT Controller experienced a loss of separation event between opposite direction traffic at 4;000; listing ill advised issued turns and a late frequency transfer from an adjacent sector as causal factors.

Narrative: A PA28; was turned southbound off of the BUR LOC for overtaking traffic a B737. A GLF4; departed LAX for VNY. I transmitted to the GLF4 4 miles south of the airspace boundary and found that he was not on frequency. Both aircraft were at 4;000 and converging. I instructed my assist that we needed to talk to the GLF4 and he initiated a call to the adjacent RADAR sector. I then issued the traffic to the PA28 at 5 miles apart. During the call my assist asked the other controller to switch that GLF4 and I told him to turn the aircraft. At 3 miles apart the PA28 reported the GLF4 in sight; I instructed the PA28 to maintain visual separation and he agreed; when that transmission ended the aircraft were less than 3 miles apart. When I finally talked to the GLF4 he was inside my airspace. Recommendation; turning the PA28 southbound off of the LOC ended up not being a very farsighted idea; by committing him to south or southwesterly heading; as opposed to southeast; I left myself no room to maneuver when the GLF4 did not check in to the frequency. Also when I advised my assist that we needed to talk to the GLF4 I should have included specific instructions to insure safety.

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	869024
Time
Date	201001
Local Time Of Day	1801-2400
Place
Locale Reference	SCT.TRACON
State Reference	CA
Aircraft 1
Make Model Name	PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Gulfstream IV / G350 / G450
Operating Under FAR Part	Part 91
Person 1
Function	Approach Departure
Qualification	Air Traffic Control Fully Certified
Person 2
Function	Handoff / Assist
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Published Material / Policy

Sct controller experienced a loss of separation event between opposite direction traffic at 4;000; listing ill advised issued turns and a late frequency transfer from an adjacent sector as causal factors.