C172 flight instructor reported an near midair collision while conducting ground reference maneuvers...

Attributes
ACN	1609143
Time
Date	201901
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	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Route In Use	None
Flight Plan	None
Aircraft 2
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	None
Person 1
Function	Instructor Pilot Flying
Qualification	Flight Crew Commercial Flight Crew Flight Instructor Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 130 Flight Crew Total 454 Flight Crew Type 380
Events
Anomaly	Conflict NMAC Deviation - Procedural Published Material / Policy
Miss Distance	Horizontal 300 Vertical 400

Narrative:

I was demonstrating how to perform the turns-around-a-point maneuver to both of my students. We had completed our pre-maneuver flow and made a radio call announcing our intention to perform ground reference maneuvers within the vicinity of [two] practice area checkpoints. I then proceeded to descend from 1;700 AGL to 1;000 AGL and began demonstrating turns-around-a-point. As half the maneuver was completed; my backseat student called out a cessna to our 7-8 o'clock approaching us from below. I aborted the maneuver and proceeded to climb; the conflicting traffic was then at our 9 o'clock; and at an approximate altitude of 500-600 AGL; passing right below us.I heard no other radio calls indicative of someone operating within the same area; or heading towards the area I was operating. A company aircraft made a radio call immediately after the event; stating a position and direction that seemed coincident with where the conflicting traffic would be after the event had occurred. I was unable to verify if they were the encountered traffic; as they had not stated their altitude. No one else had mentioned the occurrence over the practice area frequency. I believe that a lapse in communication contributed to this event.

Original NASA ASRS Text

Title: C172 flight instructor reported an NMAC while conducting ground reference maneuvers.

Narrative: I was demonstrating how to perform the Turns-around-a-point maneuver to both of my Students. We had completed our pre-maneuver flow and made a radio call announcing our intention to perform Ground Reference Maneuvers within the vicinity of [two] practice area checkpoints. I then proceeded to descend from 1;700 AGL to 1;000 AGL and began demonstrating Turns-around-a-point. As half the maneuver was completed; my backseat student called out a Cessna to our 7-8 o'clock approaching us from below. I aborted the maneuver and proceeded to climb; the conflicting traffic was then at our 9 o'clock; and at an approximate altitude of 500-600 AGL; passing right below us.I heard no other radio calls indicative of someone operating within the same area; or heading towards the area I was operating. A company aircraft made a radio call immediately after the event; stating a position and direction that seemed coincident with where the conflicting traffic would be after the event had occurred. I was unable to verify if they were the encountered traffic; as they had not stated their altitude. No one else had mentioned the occurrence over the practice area frequency. I believe that a lapse in communication contributed to this event.

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.