Salyut 4 (DOS-4) (Russian: Салют-4;
English: Salute 4) was launched on 26 December 1974. It was essentially
a copy of DOS-3, and unlike its ill-fated sibling, it was a complete
success. Two crews made stays aboard Salyut 4 (Soyuz 17 and Soyuz 18), including one of 63 days duration, and an unmanned Soyuz capsule (Soyuz 20)
remained docked to the station for three months, proving the system's
long-term durability. Salyut 4 was deorbited on 2 February 1977, and
re-entered the Earth's atmosphere the next day.
| Expedition | Crew | Launch (GMT) | Flight up | Landing (GMT) | Flight down | Duration (days) |
Remarks |
|---|---|---|---|---|---|---|---|
| — | Aleksei Gubarev Georgi Grechko |
11 January 1975 21:43 |
Soyuz 17 | 10 February 1975 11:03 |
Soyuz 17 | 29.56 | |
| — | Vasily Lazarev Oleg Makarov |
5 April 1975 11:04 |
Soyuz 7K-T #39 | 5 April 1975 11:26 |
Soyuz 7K-T #39 | 0.02 | Failed to orbit |
| — | Pyotr Klimuk Vitali Sevastyanov |
24 May 1975 14:58 |
Soyuz 18 | 26 July 1975 14:18 |
Soyuz 18 | 62.97 |
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