Da-20 pilot reported an near midair collision at a non-towered airport with a non reporting aircraft...

Attributes
ACN	1503538
Time
Date	201712
Local Time Of Day	1201-1800
Place
Locale Reference	CCO.Airport
State Reference	GA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	DA20 Undifferentiated
Flight Phase	Final Approach
Flight Plan	None
Aircraft 2
Make Model Name	PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Flight Phase	Final Approach
Person 1
Function	Pilot Flying
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 250 Flight Crew Total 450 Flight Crew Type 330
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 200 Vertical 200

Narrative:

While we were on a 1.5 mile final on the ILS for 32 into cco; after making plenty of radio calls stating our position; an aircraft (what looked like a piper arrow) turned base and was headed straight for us without making any radio calls. There were 3 other aircraft in the pattern and none of them were aware that there was a fourth plane in the pattern. I noticed the arrow coming at us from our left side. I took control of the aircraft from the student and broke off the approach (in an evasive maneuver) to make a 360. Aircraft was within 200 feet of my aircraft. Had I not seen the aircraft; they would have turned final right into us. The plane then proceeded to turn final; land; taxi off of 32 and then back to 32 for departure without making any calls.

Original NASA ASRS Text

Title: DA-20 pilot reported an NMAC at a non-towered airport with a non reporting aircraft.

Narrative: While we were on a 1.5 mile final on the ILS for 32 into CCO; after making plenty of radio calls stating our position; an aircraft (what looked like a Piper Arrow) turned base and was headed straight for us without making any radio calls. There were 3 other aircraft in the pattern and none of them were aware that there was a fourth plane in the pattern. I noticed the Arrow coming at us from our left side. I took control of the aircraft from the student and broke off the approach (in an evasive maneuver) to make a 360. Aircraft was within 200 feet of my aircraft. Had I not seen the aircraft; they would have turned final right into us. The plane then proceeded to turn final; land; taxi off of 32 and then back to 32 for departure without making any calls.

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.