Date: 201201
Local time of day: 1801-2400
Location: ZZZ.TRACON, US
Light: Night
Aircraft: Regional Jet 200 ER/LR (CRJ200)
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Descent
Airspace: Class C ZZZ
ATC / advisory: TRACON ZZZ
Reporter organization: Government
Reporter function: Approach; Departure
Reporter qualification: Air Traffic Control Fully Certified
Human factors: Confusion; Situational Awareness; Training / Qualification
Second reporter function: Approach; Departure
Anomaly: ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Air Traffic Control
Result: Air Traffic Control Issued New Clearance
Contributing factors: Human Factors
Primary problem: Human Factors

Narrative: I was the OJTI providing training to a Developmental on all RADAR positions combined.  We were working approximately 8-10 aircraft at the time of the event.  The Developmental was getting behind and I was trying to help the Developmental work through the issues and catch up without having to take the position.  Aircraft X was being vectored for a Visual Approach and descending for the airport.  Aircraft Y had just called up for VFR flight following and been identified at 6;500 feet.  Aircraft X was cleared down to 5;000 feet and had received several vectors around overflight traffic.  The final vector that aircraft X was given prior to the event; was a heading of 220 from the northeast to be set up on a right base for Runway XX.  I told the Developmental to instruct aircraft X to turn right heading 240; descend to 4;000 feet; and issue traffic on aircraft Y because the 2 aircraft were in conflict with each other.  Aircraft X was issued traffic on aircraft Y; reported aircraft Y in sight; told to maintain visual separation; but did not respond that they would comply; then alerted that they were responding to an RA.  I did not take over the position until aircraft X said they had the traffic in sight.  I believe that this event happened because I allowed the Developmental to go too far without taking the position.  I allowed myself to be distracted by helping the Developmental with lower priorities.  At the time that I realized aircraft X and aircraft Y were in an unsafe situation; my resolution was too little too late.  I had told the Developmental what to do instead of just taking over the position and doing what I believed needed to be done.  I have trained the Developmental for the past year and was comfortable with knowing what their abilities were and were not.  I became complacent as the session dragged on.  I would recommend that at no time should this position be in the TRACON alone and without assistance.  If training is being conducted; there should be an assist or flight data controller signed on position and working in the TRACON. Also; when training; sessions should be kept to; 1 hour or as close to 1 hour; as possible to prevent OJTI fatigue.  Being the OJTI for 1hour and 30 minuets is much more difficult and challenging than just working the position by yourself.


Second narrative: This event took place during my training session.  I had aircraft X from the northeast heading southwest bound descending from 11;000 feet to 5;000 feet.  I had a few overflights in the airspace; one that was a VFR aircraft Y flying from the southeast heading northwest bound at a heading of 065.  The instructions given to aircraft X to descend to 5;000 feet was in order to get the plane below the overflight; and then turn inbound to our airport.  After watching the rate of descent; I mentioned that I would issue a 'paper stop' and instruct aircraft X to maintain 7;000 feet until passed the traffic; my instructor then had me issue a turn and further the descent away from aircraft Y; I issued the turn and descent and issued traffic so the aircraft X pilot will be able to look for the VFR aircraft Y.  Seconds later; aircraft X said he was responding to an RA.  My instructor took over the frequency to have the aircraft X pilot advise when he was able to accept further instructions.  The pilot informed us he was able to; so I continued to turn him inbound and descend to ZZZ for the Visual Approach.  During my training session; we had a Supervisor at the facility and marked on as the CIC-2; however he was not in the TRACON during the event; this has been quite popular; supervisors will be 'CIC-2' yet not be in the TRACON.  About 5-10 minutes after the RA; I gave the position to the Supervisor.  After I monitored the position for the required time; I attempted to discuss the training session with my OJTI; yet was instructed to go up to the tower and get on Local Control.  After a training session of one hour and thirty minutes; I was working Local Control for 47 minutes; with no OJT briefing and no discussion about the RA that had just occurred.  I feel that it was simply communication between my instructor and I during the quick discussion about aircraft X getting a 'paper stop' or not.  However; the fact that the Supervisor was marked as our CIC-2; and not in the TRACON to observe the situation; could have been avoided by enforcing the title of CIC-2; and have them remain in the operation.


Synopsis: TRACON Controller providing OJT described a conflict event when failing to take over the position in a timely manner.