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05 April 1975
11:02 GMT. FAILURE: During second-third stage seperation third stage failed to separate from second stage but still ignited. Duration: 0.01 days. Call Sign: Ural (Urals ). Backup Crew: Klimuk, Sevastyanov. Nation: USSR. Launch Site: Baikonur . Launch Vehicle: Soyuz 11A511. LV Configuration: Soyuz 11A511. Program: Salyut. Class: Manned. Type: Spacecraft. Spacecraft: Soyuz 7K-T. Payload: Soyuz 7K-T s/n 39. Mass: 6,830 kg. References: 42 , 32 , 33 , 60 .