C172 instructor reported a near midair collision in the vicinity of O88 airport.

Attributes
ACN	1588134
Time
Date	201810
Local Time Of Day	0601-1200
Place
Locale Reference	O88.Airport
State Reference	CA
Aircraft 1
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Flight Plan	VFR
Person 1
Function	Instructor
Qualification	Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 140 Flight Crew Total 1200 Flight Crew Type 900
Events
Anomaly	Conflict NMAC Deviation - Procedural Published Material / Policy
Miss Distance	Horizontal 100 Vertical 90

Narrative:

We were on a training flight shooting an instrument approach into O88. We were at our MDA; making all the calls and looking for traffic; and we had to do a circle to land. We were on short final; about to touch down; and then we saw an aircraft on the right; and he was not on [the] radio. We did a go around; turned back to the left and climbed out; and warned other pilots coming in to the airport about this aircraft.

Original NASA ASRS Text

Title: C172 instructor reported a NMAC in the vicinity of O88 airport.

Narrative: We were on a training flight shooting an instrument approach into O88. We were at our MDA; making all the calls and looking for traffic; and we had to do a circle to land. We were on short final; about to touch down; and then we saw an aircraft on the right; and he was not on [the] radio. We did a go around; turned back to the left and climbed out; and warned other pilots coming in to the airport about this aircraft.

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.