What happened
On June 2, 2015, a Mi-8T, registration RA-22580, operated by UTair-Verteletnye uslugi, was engaged in a commercial mission for MIDGLEN Logistics Sakhalin. The flight plan, established under a contract from April 2015, involved transporting passengers, food, and technical cargo between Lensk airfield and several quarry sites, specifically Quarry No. 3, Quarry No. 5, and Quarry No. 2.1.
The crew, consisting of a pilot in command, a co-pilot, and a flight engineer, arrived at Lensk airfield on June 1, 2015, at approximately 23:00. After passing medical examinations at 23:05 and receiving meteorological consultations, the crew prepared the flight plan. The helicopter departed Lensk at 00:13 on June 2, carrying one passenger.
Following the initial leg, the aircraft landed at Quarry No. 3 at 01:08. Between 01:15 and 03:03, the crew performed three separate shuttle flights between Quarry No. 3 and Quarry No. 5 to deliver cargo. At 03:43, the helicopter departed Quarry No. 5, heading toward Talakan airfield for scheduled refueling and maintenance. The aircraft arrived at Talakan, where refueling and technical servicing were conducted between 04:21 and 05:04.
The investigation
The provided documentation details the flight sequence, crew medical clearance, and the execution of the planned route including refueling stops at Talakan airfield.