Narrative:

I'm with a student; doing touch and goes on runway 32 at ZZZ. The day was busy with multiple airplanes in pattern and a white helicopter all doing [charity flights]. The helicopter pilot was taking off from the helicopter pads and departing to the east as he should be during most of the morning. Someone holding short for 32 started yapping on the radio about deer on the runway. The pilots in the traffic pattern acknowledged it and continued flying. At this point I had just departed. The helicopter pilot at that time decided to fly to the west side of 32 and chase the deer around. I reported that I was on downwind for 32. I observed the helicopter circling to the west side of 32 at an approximate altitude of 20ft. I continued the base and final turn; my student flying; and me on the radio calls. I made a final call about a 3/4's of a mile down the extended center-line on 32. I observed the helicopter still circling but keeping over the grass. When my student was getting into the flare; and were touching down; the helicopter turned to the east and crossed right in front and over us. I began asking for the pilot to acknowledge me on the radio; which he did not immediately do. I asked for a radio check and another plane called out immediately that he could hear me loud and clear. I kept trying to get the helicopter pilot on the radio. He had just landed and had picked up more kids; and made a radio call that he was departing again. He then heard me squeaking at him and I asked him to write my phone number down; he said he cannot while he is flying; I asked him to ping me when he lands. 10 minutes later or so he came back on the radio and asked for the pilot that wanted to give him a phone number. I gave him my number and asked him to call me when he is done flying for the day. I got a call from him that afternoon. He identified himself [and] I introduced myself; and explained what the situation was. Had my student or I decided to do a go-around for any reason; we would have almost certainly ended up having a midair collision. I asked him to not chase deer around the runway and to keep an extra lookout when the traffic pattern is busy. He apologized about the situation and advised me that he will be extra vigilant when looking for traffic.

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Original NASA ASRS Text

Title: C172 flight instructor reported a severe conflict with a helicopter at non-towered airport.

Narrative: I'm with a student; doing touch and goes on Runway 32 at ZZZ. The day was busy with multiple airplanes in pattern and a white helicopter all doing [charity flights]. The helicopter pilot was taking off from the helicopter pads and departing to the east as he should be during most of the morning. Someone holding short for 32 started yapping on the radio about deer on the runway. The pilots in the traffic pattern acknowledged it and continued flying. At this point I had just departed. The helicopter pilot at that time decided to fly to the west side of 32 and chase the deer around. I reported that I was on downwind for 32. I observed the helicopter circling to the west side of 32 at an approximate altitude of 20ft. I continued the base and final turn; my student flying; and me on the radio calls. I made a final call about a 3/4's of a mile down the extended center-line on 32. I observed the helicopter still circling but keeping over the grass. When my student was getting into the flare; and were touching down; the helicopter turned to the east and crossed right in front and over us. I began asking for the pilot to acknowledge me on the radio; which he did not immediately do. I asked for a radio check and another plane called out immediately that he could hear me loud and clear. I kept trying to get the helicopter pilot on the radio. He had just landed and had picked up more kids; and made a radio call that he was departing again. He then heard me squeaking at him and I asked him to write my phone number down; he said he cannot while he is flying; I asked him to ping me when he lands. 10 minutes later or so he came back on the radio and asked for the pilot that wanted to give him a phone number. I gave him my number and asked him to call me when he is done flying for the day. I got a call from him that afternoon. He identified himself [and] I introduced myself; and explained what the situation was. Had my student or I decided to do a go-around for any reason; we would have almost certainly ended up having a midair collision. I asked him to not chase deer around the runway and to keep an extra lookout when the traffic pattern is busy. He apologized about the situation and advised me that he will be extra vigilant when looking for traffic.

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.