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2.7.3.4 Salyut 6 Principal Expedition 4
Leonid Popov, Valeri Ryumin
Crew code name—Dneiper
Launched in Soyuz 35, April 9, 1980
Landed in Soyuz 37, October 11, 1980
185 days in space
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Soyuz 35 • Salyut 6 • Progress 8 | April 10-25, 1980 | |
| Ryumin again in orbit. Valentin Lebedev was scheduled to be Leonid Popov’s flight engineer, but he required an operation after injuring his knee while working out on a trampoline. Ryumin, of the last crew to visit Salyut 6, was called in to fill his place. Upon entering Salyut 6, Ryumin noted that the two viewports in the transfer compartment had lost their transparency. The windows also had many chips in them caused by micrometeoroids and orbital debris.[1] The cosmonauts replaced components of the attitude control system and life support system, installed a new caution and warning system, synchronized the station’s clocks with those in the TsUP, added an 80-kg storage battery, and replaced air from tanks in Progress 8. | |||
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Soyuz 35 • Salyut 6 | April 25-29, 1980 |
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Soyuz 35 • Salyut 6 • Progress 9 | April 29-May 20, 1980 | |
| Progress 9 pumps water. Before Progress 9, Salyut 6 crewmen had to transfer water into the station in 5-kg containers. Progress 9 featured the Rodnik system, by which crewmen ran a pipe to the station’s tanks. The cargo ship transferred 180 kg of water in this manner. | |||
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Soyuz 35 • Salyut 6 | May 20-27, 1980 |
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Soyuz 35 • Salyut 6 • Soyuz 36 | April 29-May 20, 1980 | |
| Hungary in space. Valeri Kubasov and Bertalan Farkas formed the Orion Visiting Expedition crew. Hungary’s experiments were in the areas of materials processing, Earth observation, and life sciences. | |||
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Salyut 6 • Soyuz 36 | June 3-4, 1980 |
- ↑ Ryumin, p. 32.
