Schema: CREATE TABLE table_name_97 (date VARCHAR, pilot VARCHAR, type VARCHAR, record_description VARCHAR)
Question: Type of mi-10r, and a Record description of altitude with kg (lb) payload, and a Pilot of g.v. alfyorov is what date?
SQL: SELECT date FROM table_name_97 WHERE type = "mi-10r" AND record_description = "altitude with kg (lb) payload" AND pilot = "g.v. alfyorov"