CREATE TABLE table_75318 ("Date" TEXT, "Type" TEXT, "Record description" TEXT, "Achievement" TEXT, "Pilot" TEXT)

Pilot of g.v. alfyorov, and a Record description of altitude with kg (lb) payload, and a Type of mi-10 involved what date?
SELECT "Date" FROM table_75318 WHERE "Pilot" = 'g.v. alfyorov' AND "Record description" = 'altitude with kg (lb) payload' AND "Type" = 'mi-10'
SELECT "Date" FROM "table_75318" WHERE "Pilot" = 'g.v. alfyorov' AND "Record description" = 'altitude with kg (lb) payload' AND "Type" = 'mi-10'