Transported to the Mir orbital station a Soviet/Bulgarian crew comprising cosmonauts A Y Solovyev, V P Savinykh and A P Aleksandrov (Bulgaria) to conduct joint research and experiments with cosmonauts V G Titov and M K Manarov. Interim orbit 343 x 282 km. Maneuvered to Mir's 355 x 349 km orbit. Docked 15:57 GMT 9 June to Mir's aft port. Moved to forward port 18 June. Undocked 22:55 GMT 5 September. Jettisoned Orbital Module 23:35 GMT 5 September. Planned landing 02:15 September 6 1988 failed due to confusion of infrared horizon sensors. Repeat retrofire attempt one orbit later resulted in a partial burn only. The crew had to spend a tense 24 hours in the cramped Descent Module (the Orbital Module having already been jettisoned before the retrofire burn) before making last chance deorbit. Finally Lyakhov and Afghani cosmonaut Mohmand (Soyuz TM-6) returned safely to Earth and landed September 7, 1988 00:50 GMT, 160 km SE Dzhezkazgan.