Amateur/Home Built/Experimental
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 2
Training / Qualification; Situational Awareness; Confusion; Communication Breakdown
Aircraft Equipment Problem Less Severe; Conflict NMAC; Deviation - Track / Heading All Types
Air Traffic Control Separated Traffic; Flight Crew Took Evasive Action
Human Factors; Aircraft
Working CIC. Trainee on Local Control was behind; instructor started to step in. There was a Cessna in the pattern; Aircraft Y north east for a base entry and Aircraft X checked in 8 norths east for a straight in. Trainee did not know type aircraft; I told them it was an Aircraft X type. Instructor noticed the rate of speed difference; stopped the training and attempted to correct situation by changing the Aircraft Y to the left runway ahead of Aircraft X and when he noticed it would be close attempted to have Aircraft Y turn back to the downwind to pass behind Aircraft X; however; the Aircraft Y was having radio difficulties and did not respond to any transmissions. I was watching through the binoculars and told the Controller that Aircraft Y wasn't responding to the turns he was issuing. Aircraft Y made a right 360 and Aircraft X made a left 360. No traffic alert was given though he did give multiple traffic advisories. Realizing aircraft characteristics: Aircraft Y was never going to beat Aircraft X; and Aircraft Y always uses the longer runway (25R) for landing issue a traffic alert to Aircraft X when the Aircraft Y lost communications; letting him know the aircraft immediately ahead was not responding and give Aircraft X instructions to avoid the situation.
Aircraft X was on a 3 mile final for 25R; the Tower had Aircraft Y on base for 25R then decided it was going to be to close and asked Aircraft Y to cross final for 25R and take 25L.  When the Tower saw that Aircraft Y was headed directly for me he asked the Aircraft Y to turn left and go behind me.  There was no response from the Aircraft Y after 3 or 4 repeated attempts.  I could not see the Aircraft Y on my right hand side I think he may have been below me.  When I did see him he was very close and in a right turn.  We would have collided if I would have stayed on course.  I made a sharp bank to the left to avoid.
CIC from LVK Tower reports of NMAC that occurred while training was going on and the communication loss of radios with one of the involved aircraft.  Pilot reports of close call between his aircraft and another while attempting to land.