CFI reported encountering a drone at 3;500 feet altitude while conducting a training flight.

Attributes
ACN	1653346
Time
Date	201906
Local Time Of Day	1801-2400
Place
Locale Reference	GPM.Tower
State Reference	TX
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	None
Flight Plan	VFR
Aircraft 2
Make Model Name	UAV - Unpiloted Aerial Vehicle
Operating Under FAR Part	Other 107
Flight Phase	Cruise
Person 1
Qualification	Flight Crew Commercial Flight Crew Flight Instructor
Experience	Flight Crew Last 90 Days 80 Flight Crew Total 450 Flight Crew Type 300
Events
Anomaly	Conflict Airborne Conflict
Miss Distance	Horizontal 700 Vertical 200

Narrative:

I was doing a training flight with my student in the south training area of gpm. This is where we normally go to conduct VFR training flights while at 3;500 [feet] 25 ssw of gpm; over lake alvarado; east side of I-35. We were doing steep turns when I saw a drone almost a size of a computer (red and white in color); pass underneath us about 200 ft. Low; half a mile of horizontal separation. Since we were already in a steep turn; we didn't have to take any evasive action; but that was definitely a bit alarming. The aircraft is equipped with ads-B in/out and also I was flying with a potable ads-B; we didn't receive any transponder signal from the drone. The drone was on a north heading; and if it had continued that way (which I didn't see after the completion of my steep turn) he would have probably ended up in dfw class B in another 10 miles or so at that altitude. We call gpm tower; and reported the incident. Upon landing at gpm; gpm tower further asked more about the incident and the report is being filed.

Original NASA ASRS Text

Title: CFI reported encountering a drone at 3;500 feet altitude while conducting a training flight.

Narrative: I was doing a training flight with my student in the south training area of GPM. This is where we normally go to conduct VFR training flights while at 3;500 [feet] 25 SSW of GPM; over Lake Alvarado; East Side of I-35. We were doing steep turns when I saw a drone almost a size of a computer (Red and White in Color); pass underneath us about 200 ft. low; half a mile of horizontal separation. Since we were already in a steep turn; we didn't have to take any evasive action; but that was definitely a bit alarming. The aircraft is equipped with ADS-B in/out and also I was flying with a potable ADS-B; we didn't receive any transponder signal from the drone. The drone was on a north heading; and if it had continued that way (which I didn't see after the completion of my steep turn) he would have probably ended up in DFW Class B in another 10 miles or so at that altitude. We call GPM Tower; and reported the incident. Upon landing at GPM; GPM Tower further asked more about the incident and the report is being filed.

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.