Narrative:

During unfamiliar airport operations at ZZZ we had a helicopter almost hit us while we were on the take-off roll. During our pattern work; we heard a helicopter report 5 miles out from the south. We then made a call that we were short final for runway xx. My student landed the airplane and we had to taxi back for runway xx. As we were taxiing back; the helicopter called us to talk to us. I responded and told them to go ahead. They did not respond and then called us again saying they had us in sight. I responded again; and told them to go ahead. At this point we got to the run-up area where we pulled off to do a quick configuration change. The helicopter called us again and we responded a third time with no response from the helicopter. We then had the helicopter in sight as they were in a low left down-wind for runway xx. They quickly left our field of view due to trees being on the left hand side of the runway. We suspected the helicopter was on left downwind (however they never said they were; just kept trying to talk to us). We called ready for departure and checked final which was clear and taxied out (after waiting for the helicopter to respond which never responded). We taxied out and did a short field procedure and were accelerating down the runway when we got clear of the trees on the left side; the helicopter was ground level attempting to cross runway xx at midfield left to right for the ramp. We were committed and could not stop; the helicopter did stop and was yelling over the radio about us not using radios and trying to read our n-number. I tried to call them again with no response (now airborne). When we were turning crosswind; traffic from other airports called us and said they have heard all of our radio position reports. The FBO at ZZZ even called us and said they heard everything we said. The helicopter (now on the ramp) continued to call us; and even went as far as to film us as we departed for the last time. The helicopter flew a non-standard pattern and almost hit us midfield and claimed to not be able to hear us. We heard every call that they made; and had several people confirm our radios worked. The helicopter never attempted to troubleshoot their radio; as it was quite clear the problem was on their end as we had no issues completing our flight back at [origin airport]'s controlled airspace. The judgement the helicopter pilot made to attempt to cross midfield low when they never made radio contact with us was extremely dangerous and caused a near miss; especially after reporting us insight.

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Original NASA ASRS Text

Title: DA20 flight crew reported a near miss during takeoff with a Robinson helicopter that was crossing the runway without communicating.

Narrative: During unfamiliar airport operations at ZZZ we had a helicopter almost hit us while we were on the take-off roll. During our pattern work; we heard a helicopter report 5 miles out from the south. We then made a call that we were short final for runway XX. My student landed the airplane and we had to taxi back for runway XX. As we were taxiing back; the helicopter called us to talk to us. I responded and told them to go ahead. They did not respond and then called us again saying they had us in sight. I responded again; and told them to go ahead. At this point we got to the run-up area where we pulled off to do a quick configuration change. The helicopter called us again and we responded a third time with no response from the helicopter. We then had the helicopter in sight as they were in a low left down-wind for runway XX. They quickly left our field of view due to trees being on the left hand side of the runway. We suspected the helicopter was on left downwind (however they never said they were; just kept trying to talk to us). We called ready for departure and checked final which was clear and taxied out (after waiting for the helicopter to respond which never responded). We taxied out and did a short field procedure and were accelerating down the runway when we got clear of the trees on the left side; the helicopter was ground level attempting to cross runway XX at midfield left to right for the ramp. We were committed and could not stop; the helicopter did stop and was yelling over the radio about us not using radios and trying to read our N-number. I tried to call them again with no response (now airborne). When we were turning crosswind; traffic from other airports called us and said they have heard all of our radio position reports. The FBO at ZZZ even called us and said they heard everything we said. The helicopter (now on the ramp) continued to call us; and even went as far as to film us as we departed for the last time. The helicopter flew a non-standard pattern and almost hit us midfield and claimed to not be able to hear us. We heard every call that they made; and had several people confirm our radios worked. The helicopter never attempted to troubleshoot their radio; as it was quite clear the problem was on their end as we had no issues completing our flight back at [origin airport]'s controlled airspace. The judgement the helicopter pilot made to attempt to cross midfield low when they never made radio contact with us was extremely dangerous and caused a near miss; especially after reporting us insight.

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.