Air Traffic Control Fully Certified
Situational Awareness
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance
Procedure; Human Factors
I was conducting OJT on Final Center. CE500 was on the west downwind for Runway 01C at ZZZ my trainee turned CE500 to a 090 heading and descend to five thousand from six thousand. After several miles it appeared that CE500 was not turning; the pilot was questioned if they were turning and he responded yes; he was then instructed to turn to a 040 heading and intercept the localizer for Runway 01C. After several more miles of a very slow turn; CE500 was told to increase his rate of turn and maintain five thousand and that he was sequenced in front of six thousand traffic straight in (CE560). At this point I told the trainee to turn CE500 out and re-sequence him because of his slow turn. CE500 was turned to a 300 heading and told to maintain 050 at which point CE500 began to climb out of 052 and still heading East. CE500 was then told to descend immediately to 050 and to expedite his turn to 300 and told about traffic at his 3 o'clock and three miles at 060. CE500 continued to climb through 057 to 064 and still not turning to the West. I then took the frequency and told CE560 to turn immediately to a 090 and called traffic at 12 o'clock and 1 mile climbing out of 064 a Citation. They answered that they were responding to a TCAS/RA. After CE500 final turned to the West; the trainee turned him back on to the downwind but the turn was too tight and it resulted in CE500 begin to close to Aircraft Z on the straight in on Runway 01C. After the upsetting situation with CE500 and CE560 I should have kept the frequency until all situations were resolved and we could be relieved of position duties. By letting the trainee resume working; and that fact that I was still thinking about what had just occurred; I missed the shallow turn on CE500 which put them to close to the final.
TRACON Controller described a TCAS RA event during a training session with parallel approaches in use; the reporter noting that he should have continued to work the position after the initial TCAS RA in lieu of returning the position to the trainee.