Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 5
Confusion; Distraction; Training / Qualification; Workload; Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Ground Equipment Issue; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued New Clearance
Airspace Structure; Human Factors; ATC Equipment / Nav Facility / Buildings; Manuals; Procedure
Aircraft X was descended to 3;000 feet by the trainee with control from the adjacent TRACON sector. We didn't talk to him soon enough to offer a 30 degree intercept for the RNAV Approach.  We vectored him back around after requesting control from the other TRACON again. We were discussing assigning 2;000 feet to Aircraft Y landing at a different airport. The trainee turned Aircraft X heading 340; which I questioned and suggested heading 270. When the trainee issued the amended heading; she also descended Aircraft X to 2;000 feet. I did not catch it as during the same time; the trainee had released Aircraft Y off one airport and Aircraft Z off another airport; who were in conflict; in addition to an air carrier departure requesting practice approaches. I took over the frequency; and noticed Aircraft X already at 2;000 feet but he was not quite established on the approach and therefore; assigned an altitude below the Minimum Vectoring Altitude. When doing something out of the ordinary  the controller trying to help could also put the aircraft on a better heading to intercept especially when we never approved the aircraft descending to 3;000 feet. Offer Aircraft X a different RNAV approach or offer to run the approach for the lows. The Low Altitude Alert never alarmed.
TRACON Controller conducting on the job training reported they did not hear the trainee descend an aircraft to an altitude below the Minimum Vectoring Altitude because they were distracted by the trainee releasing aircraft off airports that were on conflicting routes.