What happened
On August 8, 2015, a temporary flight restriction was in effect over a field near the Istra Reservoir, specifically near the settlement of Lechishchevo. This restriction, active from 09:00 to 2/4:00 local time, had been implemented at the request of the flight manager of the "FFT" ultralight aviation club to ensure safety for paraglider operations in the Class G airspace.
At 13:38, a Robinson R-44, registration RA-04383, landed at a private landing strip located near the owner's residence in Lechishchevo, arriving from the Zalesye landing site. This landing had been coordinated with the paragliding club's flight manager. Later, at approximately 17:02, the pilot of the R-44 departed from the private strip, heading southeast toward the reservoir for a sightseeing flight. The helicopter was carrying the pilot and 3 passengers.
Simultaneously, a Cessna U206F, registration RA-67523, had been operating over the waters of the Istra Reservoir since 13:47. Unlike the helicopter, the floatplane was conducting its flight without coordination with or communication to the paragliding club's flight manager.