Narrative:

Had just taken the position with a trainee. Mitigating factors were a VFR PA27 on a picture taking mission westbound on the downwind at 5;500 ft and air carrier X was a foreign aircraft with limited english. Air carrier X; an A320 on base leg heading 330 at 6;000 ft [was] to stay above the PA27 [and] to precede air carrier Y; a B767; straight in. [The] trainee turned air carrier X to 300 heading. Air carrier X was 3 miles ahead of air carrier Y who was descending out of 6;500 ft. It didn't appear air carrier X turned as instructed and couldn't be descended due to the PA27 in the way. I instructed air carrier Y to climb to 7;000 ft for traffic and had air carrier Y maintain visual separation from air carrier X. Air carrier Y responded; but advised they were descending for an RA. I subsequently turned air carrier X left to downwind for re-sequence. We routinely have problems with this airline not responding in a timely manner. When we first assumed responsibility for the position; I new it was going to be difficult to make this sequence work; mainly due to air carrier X not being able to descend with VFR traffic in the way. I tried to let the trainee work it out; but waited too long to take over myself. Recommendation; VFR picture missions should not be approved on downwind during known times of aircraft inbound from sli. These missions are routinely approved by someone who obviously isn't familiar with our traffic. They should be approved by the flm after the flm has checked traffic for that day.

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Original NASA ASRS Text

Title: SCT Controller providing OJT described a TCAS RA event caused when a foreign aircraft failed to turn as directed and the subsequent aircraft received a TCAS RA.

Narrative: Had just taken the position with a trainee. Mitigating factors were a VFR PA27 on a picture taking mission westbound on the downwind at 5;500 FT and Air Carrier X was a foreign aircraft with limited English. Air Carrier X; an A320 on base leg heading 330 at 6;000 FT [was] to stay above the PA27 [and] to precede Air Carrier Y; a B767; straight in. [The] trainee turned Air Carrier X to 300 heading. Air Carrier X was 3 miles ahead of Air Carrier Y who was descending out of 6;500 FT. It didn't appear Air Carrier X turned as instructed and couldn't be descended due to the PA27 in the way. I instructed Air Carrier Y to climb to 7;000 FT for traffic and had Air Carrier Y maintain visual separation from Air Carrier X. Air Carrier Y responded; but advised they were descending for an RA. I subsequently turned Air Carrier X left to downwind for re-sequence. We routinely have problems with this airline not responding in a timely manner. When we first assumed responsibility for the position; I new it was going to be difficult to make this sequence work; mainly due to Air Carrier X not being able to descend with VFR traffic in the way. I tried to let the trainee work it out; but waited too long to take over myself. Recommendation; VFR picture missions should not be approved on downwind during known times of aircraft inbound from SLI. These missions are routinely approved by someone who obviously isn't familiar with our traffic. They should be approved by the FLM after the FLM has checked traffic for that day.

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.