BE23 instructor reported a near midair collision on approach.

Attributes
ACN	1651174
Time
Date	201906
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Sundowner 23
Operating Under FAR Part	Part 91
Flight Phase	Initial Approach
Route In Use	Direct
Flight Plan	None
Aircraft 2
Make Model Name	Small Aircraft High Wing 1 Eng Fixed Gear
Flight Plan	None
Person 1
Function	Instructor
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 73 Flight Crew Total 854 Flight Crew Type 405
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 100 Vertical 100

Narrative:

While practicing instrument approaches in visual conditions; established on the 069 radial inbound and descending to the augusta airport; visual contact was made with a high-wing plane at a range of approximately 300 feet horizontally and 100 feet vertically. That aircraft suddenly passed beneath us from south to north at a range of less than 100 feet vertically and horizontally; visual contact was lost when the high-wing plane passed under our low-wing aircraft requiring immediate evasive actions by the instructor to halt the decent and climb to avoid a mid-air collision with the plane passing beneath us. When we informed the aircraft that they has passed extremely close beneath us on the local CTAF frequency; the response on the radio was: 'well I didn't see you and you weren't on my screen'; alluding to the fact that our aircraft did not appear on his ads-B in equipped equipment as this training aircraft is not equipped with ads-B. The level of complacency displayed with that single comment leads to the idea that pilots may have a significant misunderstanding of how ads-B is required and works. Furthermore; the presence of such a system does not preclude the 'see and avoid' rules.

Original NASA ASRS Text

Title: BE23 instructor reported a NMAC on approach.

Narrative: While practicing instrument approaches in visual conditions; established on the 069 radial inbound and descending to the Augusta airport; visual contact was made with a high-wing plane at a range of approximately 300 feet horizontally and 100 feet vertically. That aircraft suddenly passed beneath us from south to north at a range of less than 100 feet vertically and horizontally; visual contact was lost when the high-wing plane passed under our low-wing aircraft requiring immediate evasive actions by the instructor to halt the decent and climb to avoid a mid-air collision with the plane passing beneath us. When we informed the aircraft that they has passed extremely close beneath us on the local CTAF frequency; the response on the radio was: 'well I didn't see you and you weren't on my screen'; alluding to the fact that our aircraft did not appear on his ADS-B in equipped equipment as this training aircraft is not equipped with ADS-B. The level of complacency displayed with that single comment leads to the idea that pilots may have a significant misunderstanding of how ADS-B is required and works. Furthermore; the presence of such a system does not preclude the 'see and avoid' rules.

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.