A local controller and inbound instructor pilot reported a near mid air collision with an aircraft m...

Attributes
ACN	1454902
Time
Date	201706
Local Time Of Day	1801-2400
Place
Locale Reference	FAR.TRACON
State Reference	ND
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft Low Wing 1 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Direct
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft Low Wing 1 Eng Fixed Gear
Flight Phase	Climb Cruise Descent
Route In Use	None
Flight Plan	VFR
Events
Anomaly	ATC Issue All Types Conflict NMAC

Narrative:

Aircraft X was on an ILS approach. On initial contact I cleared them for the option and issued traffic stating that targets were likely to merge. Aircraft X advised traffic in sight and I asked if it was a helicopter or a plane. They stated a plane. At that time aircraft Y called on frequency stating that they were the traffic that aircraft X had in sight and were going to be flying around the area. The flight paths had crossed and I went back to my other traffic. During that time aircraft Y made a climbing right turn back into aircraft X. Aircraft X reported that they were in a climb to avoid aircraft Y.I would issue a beacon code and identify the secondary aircraft to control his actions.

Original NASA ASRS Text

Title: A Local controller and inbound instructor pilot reported a near mid air collision with an aircraft maneuvering into the path of an the aircraft conducting an ILS Approach.

Narrative: Aircraft X was on an ILS Approach. On initial contact I cleared them for the option and issued traffic stating that targets were likely to merge. Aircraft X advised traffic in sight and I asked if it was a helicopter or a plane. They stated a plane. At that time Aircraft Y called on frequency stating that they were the traffic that Aircraft X had in sight and were going to be flying around the area. The flight paths had crossed and I went back to my other traffic. During that time Aircraft Y made a climbing right turn back into Aircraft X. Aircraft X reported that they were in a climb to avoid Aircraft Y.I would issue a beacon code and identify the secondary aircraft to control his actions.

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.

A local controller and inbound instructor pilot reported a near mid air collision with an aircraft maneuvering into the path of an the aircraft conducting an ILS approach.