TRACON controller described a TCAS RA event during a training session with parallel approaches in us...

Narrative:

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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site as of July 2013 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	1006063
Time
Date	201204
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Aircraft 1
Make Model Name	Citation I (C500)
Flight Phase	Descent
Route In Use	Vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Citation V/Ultra/Encore (C560)
Flight Phase	Cruise
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

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.