Large Transport
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 6
Training / Qualification
Conflict NMAC; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance
Human Factors; Procedure
I was training on the LC-2; Local 2; position. At this time traffic was moderate with 3 aircraft in the pattern mixed with inbounds and departures. Aircraft Y called up and was assigned an EL Toro Departure; an eastbound departure with an initial heading of 080. My trainee cleared Aircraft Y for takeoff and then proceeded to do other things that needed his attention; such as obtaining visual separation with aircraft on final for the parallel runway; sequencing aircraft for the pattern; as well as issuing wake turbulence and jet blast cautionary for aircraft landing Runway 20L.When Aircraft Y started takeoff roll; Aircraft X was cleared for takeoff on Runway 20R. On the upwind; Aircraft Y drifted slightly right of course into the flightpath of Aircraft X taking off. Both my trainee and I failed to notice this as our attention was diverted to other duties. When the CIC mentioned that Aircraft Y was drifting right of course; I immediately over-keyed my trainee to attempt to rectify the situation but Aircraft X had veered right to avoid Aircraft Y. Aircraft Y failed to offset 15 degrees to the left upon takeoff; which is required per the AFD; Airport Facility Directory. I understand that I failed to notice the drift that occurred on the upwind and the failure of Aircraft Y to offset left of course 15 degrees upon departure. One of the things that I would recommend is that there be signage; such as at intersection Kilo departure on Runway 20L - this is the standard point of departure for most aircraft for Runway 20L - that reminds aircraft to offset left of course 15 degrees upon departure.
SNA Tower Instructor reported that an aircraft did not offset 15 degrees on takeoff as required per the AFD and came close to a commercial airliner also departing; on a parallel runway.