A local controller received a report of an near midair collision between and E145 under his control ...

Narrative:

I was working the east arrival position with moderate to heavy traffic. The weather was VFR. I took a handoff on an E145 that was descending to 11;000 ft and 250 KTS. The aircraft was inbound for landing and runway 26 was in use. When the E145 checked in I descended the aircraft to 8;000 ft. Shortly thereafter the E145 advised that he had a near mid air collision (near midair collision) with a turboprop at or around 10;000 ft. I did not issue traffic on a target that I observed after the E145 declared the near midair collision. I was very busy at this time and the traffic that I observed after was a VFR aircraft that appeared to be doing aerobatic maneuvers within the confines of [two victor airways]; between the altitudes of 8;000 and 10;500 ft. After the pilot declared the near midair collision; I asked the supervisor in charge at the time for a radar handoff/assist due to extreme workload and moderate to heavy traffic; and received a help shortly after; and all service was normal without further issues. I also advised the supervisor that the pilot had declared a near midair collision on frequency at the time of the incident. I asked to be relieved from position and was relieved of position. I then listened to the voice replay of the incident and then the radar replay of the incident. At the time this occurred I did not observe the traffic being a factor for the E145 and did not issue the traffic; due to workload. When reviewing the radar; I noticed that shortly after this the VFR aircraft called another sector and was positively identified as a VFR texan that is based out of [a nearby military] airport. I believe that the texan was performing aerobatics within the confines of an airway outside of class charlie airspace; which is very crucial piece of airspace due to arriving and departing aircraft entering and exiting our airspace. I was told that the military understands the high volume of traffic in this area and are briefed to not perform aerobatics in this area; as they have a north and south MOA in our airspace that has been delegated for their pilots to do these types of maneuvers. I believe a briefing should be sent to the [military airports] squadrons as soon as possible to prevent further issues such as these.

Original NASA ASRS Text

Title: A Local Controller received a report of an NMAC between and E145 under his control and a turboprop aircraft later identified as a VFR Beechcraft T6-A Texan military trainer that appeared to be performing aerobatics.

Narrative: I was working the East Arrival position with moderate to heavy traffic. The weather was VFR. I took a handoff on an E145 that was descending to 11;000 FT and 250 KTS. The aircraft was inbound for landing and Runway 26 was in use. When the E145 checked in I descended the aircraft to 8;000 FT. Shortly thereafter the E145 advised that he had a Near Mid Air Collision (NMAC) with a turboprop at or around 10;000 FT. I did not issue traffic on a target that I observed after the E145 declared the NMAC. I was very busy at this time and the traffic that I observed after was a VFR aircraft that appeared to be doing aerobatic maneuvers within the confines of [two victor airways]; between the altitudes of 8;000 and 10;500 FT. After the pilot declared the NMAC; I asked the Supervisor in charge at the time for a Radar Handoff/Assist due to extreme workload and moderate to heavy traffic; and received a help shortly after; and all service was normal without further issues. I also advised the Supervisor that the pilot had declared a NMAC on frequency at the time of the incident. I asked to be relieved from position and was relieved of position. I then listened to the voice replay of the incident and then the radar replay of the incident. At the time this occurred I did not observe the traffic being a factor for the E145 and did not issue the traffic; due to workload. When reviewing the radar; I noticed that shortly after this the VFR aircraft called another sector and was positively identified as a VFR Texan that is based out of [a nearby military] airport. I believe that the Texan was performing aerobatics within the confines of an airway outside of Class Charlie airspace; which is very crucial piece of airspace due to arriving and departing aircraft entering and exiting our airspace. I was told that the Military understands the high volume of traffic in this area and are briefed to not perform aerobatics in this area; as they have a north and south MOA in our airspace that has been delegated for their pilots to do these types of maneuvers. I believe a briefing should be sent to the [military airports] squadrons ASAP to prevent further issues such as these.

Data retrieved from NASA's ASRS site as of July 2013 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.

Attributes
ACN	1100815
Time
Date	201307
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Aircraft 2
Make Model Name	T6A Texan II / Harvard II (Raytheon)
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	None
Person 1
Function	Approach Departure
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	Conflict Airborne Conflict Deviation - Procedural FAR

A local controller received a report of an near midair collision between and E145 under his control and a turboprop aircraft later identified as a VFR beechcraft T6-a texan military trainer that appeared to be performing aerobatics.