Soyuz 25

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Mission dates
Mission: Soyuz 25
COSPAR-ID : 1977-099A
Spacecraft: Soyuz 7K-T ( GRAY index  11F615A8)
serial number 42
Dimensions: 6860 kg
Launcher: Soyuz U (GRAY index 11A511U)
Call sign: Фотон (" photon ")
Crew: 2
Begin: October 9, 1977, 02:40:35  UTC
Starting place: Baikonur 1/5
Space station: Salyut 6
Landing: October 11, 1977, 03:25:20 UTC
Landing place: 185 km northwest of Zelinograd
Flight duration: 2d 0h 44min 45s
Earth orbits: 32
Rotation time : 88.66 min
Apogee : 258 km
Perigee : 198 km
◄ Before / After ►
Soyuz 24
(manned) 		Soyuz 26
(manned)

Soyuz 25 is the mission name for the flight of a Soviet Soyuz spaceship to the Soviet space station Salyut 6, which started on October 9, 1977 . It was the first (unsuccessful) visit by a Soyuz spaceship to this space station and the 43rd flight in the Soviet Soyuz program.

crew

Main crew

While Kovaljonok was previously in the support team of Soyuz 13 and the substitute team of Soyuz 18 , Ryumin had previously not been assigned to a team.

Substitute team

The support team consisted of Vladimir Lyachow and Georgi Grechko .

Mission overview

With the Soyuz 25 mission, work with the Salyut 6 station should begin. After the scheduled start and orbit correction, an approach to 240 m took place on October 10th without any problems. The direct coupling was initiated at a distance of 120 m, but it failed because there had been deviations from the planned path values. The demolition was then initiated, while the spaceship was just over the Mediterranean. These deviations were attributed to errors in the automatic system of approximation and coupling. The problem with the faulty mechanism was only clarified by Soyuz 26 when it checked the second coupling adapter during an outboard operation .

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

The failure also led to a review of the practice of making a team only newcomers. For future missions, at least one cosmonaut should have flying experience. This rule was only deviated from again in 1994 with Soyuz TM-19 .

See also

Web links