Launch from the Baikonur Cosmodrome; landing with Soyuz 29 spacecraft 180 km southeast of Dzheskasgan. It was the third Interkosmos mission. Following a two day solo flight the Soyuz docked with the Salyut 6 space station on 28.08.1978 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.