PA28 instructor pilot reported experiencing a near midair collision in the pattern at Y14.

Attributes
ACN	1460593
Time
Date	201706
Local Time Of Day	0601-1200
Place
Locale Reference	Y14.Airport
State Reference	SD
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Visual Approach
Aircraft 2
Make Model Name	SR22
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Visual Approach
Person 1
Function	Pilot Not Flying Instructor
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Commercial
Experience	Flight Crew Last 90 Days 334 Flight Crew Total 673 Flight Crew Type 500
Events
Anomaly	Conflict NMAC
Miss Distance	Vertical 100

Narrative:

When on downwind at Y14; [I] made a call when midfield at 1000 AGL. [A second aircraft] made a '10 miles to the west; landing runway 16 lincoln county' call. [We] made [our] landing and proceeded to takeoff for more pattern work. When approaching downwind for runway 16 [we] made another downwind call to Y14. Upon turning base to final; I noticed a shadow of an airplane coming directly at us. I took evasive action to get out of the area to avoid a mid-air collision. When finally getting visual contact with [the other aircraft] there was 100 ft vertical separation between our two airplanes. While no radio calls are required at Y14; [the other aircraft] did take advantage of 91.113 and endangered the lives of other pilots and pedestrians on the ground.

Original NASA ASRS Text

Title: PA28 instructor pilot reported experiencing a NMAC in the pattern at Y14.

Narrative: When on downwind at Y14; [I] made a call when midfield at 1000 AGL. [A second aircraft] made a '10 miles to the west; landing runway 16 Lincoln County' call. [We] made [our] landing and proceeded to takeoff for more pattern work. When approaching downwind for runway 16 [we] made another downwind call to Y14. Upon turning base to final; I noticed a shadow of an airplane coming directly at us. I took evasive action to get out of the area to avoid a mid-air collision. When finally getting visual contact with [the other aircraft] there was 100 ft vertical separation between our two airplanes. While no radio calls are required at Y14; [the other aircraft] did take advantage of 91.113 and endangered the lives of other pilots and pedestrians on the ground.

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.