Ivanov flew as research cosmonaut in the joint Interkosmos programme. The planned visit to Salyut 6 did not take place. The capsule preserved at Krumovo documents the flight and return. It does not contain the failed engine, whose module was discarded before landing. Flew with Nikolai Rukavishnikov on 10 April 1979. An engine failure led to cancellation of docking. Returned to Earth on 12 April. Bulgarian instruments had a history beyond this flight; unperformed experiments are not his work.
History of Bulgaria
