Human Spaceflights

International Flight No. 60

Soyuz 25



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Launch, orbit and landing data

Launch date:  09.10.1977
Launch time:  02:40 UTC
Launch site:  Baikonur
Launch pad:  1
Altitude:  194 - 240 km
Inclination:  51,64°
Landing date:  11.10.1977
Landing time:  03:25 UTC
Landing site:  185 km NW of Tselinograd

walkout photo

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alternate crew photo

alternate crew photo

alternate crew photo

alternate crew photo


No.   Surname Given names Position Flight No. Duration Orbits
1  Kovalyonok  Vladimir Vasiliyevich  Commander 1 2d 00h 44m  32 
2  Ryumin  Valeri Viktorovich  Flight Engineer 1 2d 00h 44m  32 

Crew seating arrangement

1  Kovalyonok
2  Ryumin
1  Kovalyonok
2  Ryumin

Animations: Soyuz

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Double Crew

No.   Surname Given names Position
1  Romanenko  Yuri Viktorovich  Commander
2  Ivanchenkov  Aleksandr Sergeyevich  Flight Engineer


Launch from the Baikonur Cosmodrome; landing 185 km northwest of Tselinograd.

The spacecraft approached the station the next day, and it contacted the forward port, but Soyuz 25 failed to make a hard dock with the station. The cosmonauts told the ground crew that they had attempted to dock four times, but that the contact light failed to come on. While the crew waited in soft dock - the docking system probe was latched onto the Salyut docking drogue, but the probe had failed to retract and bring the craft together - the ground crew studied the problem. On the 20th orbit, Vladimir Kovalyonok undocked the Soyuz, and attempted to dock for the fifth time during the 23rd orbit, but failed again. The decision was made to return to Earth, as the Soyuz was equipped with batteries designed to last about two days, and the craft lacked fuel to attempt to dock with the port on the opposite side of the station.

Another problem of this mission was, that only rookies flew. The rules were changed, so that a rookie only could fly together with a veteran cosmonaut. Until the mission of Soyuz TM-19 this rules were not changed again.

The premature return to Earth was without additional more problems.



Last update on March 29, 2013.