SELECT date FROM table_name_39 WHERE pilot = "g.v. alfyorov" AND record_description = "altitude with kg (lb) payload" AND type = "mi-10"
Pilot G.V.Alfyorov, dan deskripsi catatan ketinggian dengan muatan KG (lb), dan jenis MI-10 yang terlibat tanggal berapa?
CREATE TABLE table_name_39 (date VARCHAR, type VARCHAR, pilot VARCHAR, record_description VARCHAR)