1975-F02
Spacecraft 7K-T No. 39 was launched on 1975 Apr 5, carrying the second expedition to the DOS 4 space station, Vasiliy Lazarev and Oleg Makarov. Five minutes after launch, the R-7 core cutoff but failed to separate completely, as the Blok-I stage ignited. The dead weight of the R-7 dragged the launcher off course and the mission was aborted; the BO and SA of the spacecraft separated from the PAO, which remained attached to the Blok-I stage. The fairing was jettisoned and the spacecraft reached an apogee of 192 km before beginning a 20-g reentry. The BO separated from the SA. Then the SA, containing the crew, crash-landed in the Altai mountains 1574 km southwest of Gorno-Altaisk, in Mongolia and near the Chinese border. The flight had lasted 21 minutes and 27 seconds.
Under pressure from the US because of the upcoming ASTP launch, the failed launch was revealed by the USSR a few days later, but it was not assigned the Soyuz-18 name. Contemporary public Soviet announcements refer to it only as `Anomaliya Pyatovo Aprela', the April 5th Anomaly. The failure analysis rapidly gave the green light to ASTP, the Soviets claiming that the failure was specific to the older model of booster being used for the April 5 launch (it used the 11A511, while Soyuz-19 would use the newer 11A511U).
| Soyuz 7K-T No. 39 | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 1975 Apr 5 | 1104:54 | Launch by Soyuz 11A511 | KB LC1 |
| 1109:45 | R-7/Blok-I sep failed (T+4:51), alt 145 km | ||
| 1110 | Blok-I ignition | ||
| 1110 | Abort | ||
| 1110 | BO/SA sep from PAO/Blok-I | ||
| 1110 | Fairing jettison | ||
| 1111 | Apogee, 192 km | -4750? x 192 x 51.6 | |
| 1114? | BO sep from SA | ||
| 1115? | Reentry, 20 g | ||
| 1126:21 | Landed in Altai Mts. 50 50N 83 25E | ||
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