Launch from Baikonur; landing with Soyuz 36-capsule 200 km southeast of Dzheskasgan. Sixth Interkosmos-mission. Docking on Salyut 6-spacestation and common work with the fourth resident crew.

Pham and his crewmate had to perform 30 experiments including photography of Earth surface, especially observing Vietnam from space. Other experiments were comprehensive test of lungs-function, life sciences (including tests of growth of Vietnamese azolla water ferns) and materials processing.