Controller in charge from lvk tower reports of near midair collision that occurred while training wa...

Attributes
ACN	1172405
Time
Date	201405
Local Time Of Day	1801-2400
Place
Locale Reference	LVK.Airport
State Reference	CA
Aircraft 1
Make Model Name	Amateur/Home Built/Experimental
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	None
Flight Plan	VFR
Aircraft 2
Make Model Name	Small Aircraft Low Wing 1 Eng Fixed Gear
Flight Phase	Descent
Person 1
Function	Supervisor / CIC
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 2
Person 2
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Private
Experience	Flight Crew Last 90 Days 21 Flight Crew Total 274 Flight Crew Type 32
Events
Anomaly	Aircraft Equipment Problem Less Severe Conflict NMAC Deviation - Track / Heading All Types

Narrative:

Working controller in charge. 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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Controller in charge from lvk tower reports of near midair collision 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.