Mri controller was advised of a possible near midair collision that reportedly occurred during a bri...

Attributes
ACN	904930
Time
Date	201008
Local Time Of Day	1801-2400
Place
Locale Reference	MRI.Airport
State Reference	AK
Aircraft 1
Make Model Name	Cessna 310/T310C
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	None
Flight Plan	VFR
Aircraft 2
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Flight Plan	VFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Person 2
Function	Single Pilot Pilot Flying
Qualification	Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 155 Flight Crew Total 4000 Flight Crew Type 986
Events
Anomaly	ATC Issue All Types Conflict NMAC

Narrative:

I was informed of a possible near midair collision between a C310 and a C172. I was working a short spurt of complex busy traffic. I did not talk to the C310 until after the event had transpired. At the time of the event I was focused on numerous aircraft in the pattern and on the runways. I issued traffic observed to the C172 prior to transferring control to A11; I did not observe the C310 on the radar at that point. Recommendation; both the ground controller and controller in charge say they were telling me about the traffic; however two way communication was never established. A simple touch on the shoulder or walking over and pointing to the radar targets could have achieved the communication. Also; and more importantly; a drop zone for the pattern on stars has never been instituted even though it's been suggested on numerous occasions. The MSAW/ca goes off incessantly; rendering it useless.

Original NASA ASRS Text

Title: MRI Controller was advised of a possible NMAC that reportedly occurred during a brief complex traffic period but went unnoticed by the reporter.

Narrative: I was informed of a possible NMAC between a C310 and a C172. I was working a short spurt of complex busy traffic. I did not talk to the C310 until after the event had transpired. At the time of the event I was focused on numerous aircraft in the pattern and on the runways. I issued traffic observed to the C172 prior to transferring control to A11; I did not observe the C310 on the RADAR at that point. Recommendation; both the Ground Controller and CIC say they were telling me about the traffic; however two way communication was never established. A simple touch on the shoulder or walking over and pointing to the RADAR targets could have achieved the communication. Also; and more importantly; a drop zone for the pattern on STARS has never been instituted even though it's been suggested on numerous occasions. The MSAW/CA goes off incessantly; rendering it useless.

Data retrieved from NASA's ASRS site as of April 2012 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.

Mri controller was advised of a possible near midair collision that reportedly occurred during a brief complex traffic period but went unnoticed by the reporter.