PA-24 Comanche
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 2
Training / Qualification; Communication Breakdown; Situational Awareness; Time Pressure
ATC Issue All Types; Airspace Violation All Types; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Separated Traffic; Flight Crew Returned To Clearance
Human Factors; Procedure
I was providing On the Job Training on our combined Local South position. We were active Runway 8R and Runway 8L; advertising visual approaches (all of our instrument approaches go to RY26R; therefore we run a lot of opposite direction practice/actual approaches.) We are not active 8s often; so when we are our pilots are less familiar and it's more difficult for us controllers as well. My trainee had departed Aircraft X; requesting straight out and had moved on to working other aircraft.I saw Aircraft Y inbound; opposite direction from the east with 'VL' in his data block; indicating a visual approach to the left runway; I assumed it was for Runway 8L. I told my developmental to do something with the Aircraft X; he did not hear me. I told him again and the closure rate was so fast by the time he could issue instructions; I had to step in and issue a traffic alert and turned the Aircraft X to the south; expecting Aircraft Y to turn northwest. A visual approach to Runway 8L would normally be issued to circle north of the field for a left downwind entry. SoCal approach had apparently also issued the south turn to Aircraft Y but it was hard to tell as FUSION showed the targets all over the place. The aircraft missed by about a mile and maybe 100 feet. When we established communication with Aircraft Y he told us that SCT had set him up for a visual approach to Runway 26L; which we knew nothing about; there had been no coordination. We were unable to communicate with the Aircraft X after traffic had passed and he appeared to climb into the ONT Class C eastbound. I don't know what could happen to better facilitate the approach issue with SCT; but as far as the aircraft proximity; I should step in earlier next time. I like to give my developmental the opportunity to fix problems; even if I have to prompt them. However with that closure rate I should have just keyed up and fixed it myself early enough that it was not a safety issue.
CNO Tower Local Instructor reported seeing a conflict and hoping the developmental would fix the problem. Instructor prompted developmental to no avail. Arrival and departure had a loss of separation due to timing and lack of communication from overlying TRACON.