any scheme involving helicopters within visual and aural range of horses is (a) dangerous, and (b) sheer lunacy.
Not always the case....we operate an air ambulance in a rural area of UK and average about a 100 horse riding incidents a year (approx 10% of our call-outs).
Many of these involve landings at riding schools or cross country riding events.
We have even been sent to incidents caused by horses spooked by aircraft.
Good comms with those on the ground and a favourable wind always helps but extreme caution is always required.
It also helps operating a relatively quiet helicopter (902)