Launch from Baikonur; landing with Soyuz 29-spacecraft 180 km southeast of Dzheskasgan; third Interkosmos-mission. Docking on Salyut 6 spacestation and common work with the second resident crew.

Jähn became the first German in space. The crew conducted several scientific experiments in the areas materials research, Earth exploration, atmosphere research, medicine and biology. Using the two melting furnaces on board new connections and semiconductor structures were made of lead and tellurium, crystal growths experiments were performed and even optical glasses were melted. Observations to environmental pollutions were also performed.

Life sciences experiments were performed on the fields of hearing sensitivity, time feeling and also tasting. Experiments to bacteria growth and for the development of single-celled organisms had also been done. Science work of Earth exploration included earth photography and meteorological measurements.