Soyuz 25

Soyuz 25 mission is the designation for the flight of a Soviet Soyuz spacecraft to the Soviet space station Salyut 6 It was the first (unsuccessful ) visit a Soyuz spacecraft in this space station and the 43rd flight of Soviet Sojusprogramm.


Main occupation

  • Vladimir Vasilyevich Kovalyonok ( first space flight), Commander
  • Valeri Viktorovich Rjumin ( first space flight ), flight engineer

While Kovalyonok was previously in the support crew of Soyuz 13 and the backup crew of Soyuz 18, Rjumin had previously no divisions to a team.

Backup crew

  • Yuri Viktorovich Romanenko, Commander
  • Alexander Sergeyevich Ivanchenkov, Flight Engineer

The support team consisted of Vladimir and Georgi Grechko Liakhov.

Mission overview

With the mission Soyuz 25 to work with the station Salyut 6 should be added. According to plan, launch and orbit correction was made on October 10, an approximation to 240 meters without any problems. At a distance of 120 m, the direct coupling was initiated, but failed because there had been deviations from the intended path values. Then the abort was initiated, thereby the spaceship was just above the Mediterranean. These differences were attributed to errors in the automated system of approach and coupling. A clarification of the problems with the faulty mechanism was only brought Soyuz 26 with a control of the second coupling adapter with a spacewalk.

Since the used Soyuz spacecraft ( manufacturer's designation Soyuz 7K- T) had no solar panels for power supply, only reserves for two space flight days were available and the landing had to be initiated, then successfully carried out in the steppe 185 km north-west of Zelinograd in Kazakhstan.

The bust also led to a review of the practice to have a team consisting only of newcomers. For future missions should at least have a cosmonaut flight experience. This rule was not until 1994 that deviated in Soyuz TM -19 again.