Soyuz 7K-T

The second generation of the Soyuz spacecraft, the Soyuz Ferry or Soyuz 7K-T, comprised Soyuz 12 through Soyuz 40 (1973-1981). In the wake of the Soyuz 11 tragedy, the spacecraft was redesigned to accommodate two cosmonauts who would wear pressure suits at all times during launch, docking, undocking, and reentry. The place of the third cosmonaut was taken by extra life-support systems. Finally, the 7K-T, being intended purely as a space station ferry, had no solar panels, instead sporting two large whip antennas in their place. As a result, it relied on batteries which only provided enough power for two days of standalone flight. The idea was that the Soyuz would recharge while docked with a Salyut space station, but in the event of a docking or other mission failure (which ended up happening on several occasions), the crew was forced to power off everything except communications and life support systems until they could reenter.

Not to be confused with Soyuz-T.
Soyuz 7K-T or "ferry"
Upgraded Soyuz 7K-T version capable of carrying 2 cosmonauts with Sokol space suits (after the Soyuz 11 accident).
ManufacturerKorolev
Country of origin Soviet Union
OperatorSoviet space program
ApplicationsCarry two cosmonauts to orbit and back
Specifications
RegimeLow Earth orbit
Production
StatusOut of service
Launched30
Maiden launchKosmos 496, 1972
Last launchSoyuz 40, 1981
Related spacecraft
Derived fromSoyuz 7K-OKS
DerivativesSoyuz 7K-TM (ASTP)
Soyuz-T (successor)
Salyut 1-type Soyuz 7K-T/A9 for 3 cosmonauts without space suits. This was the Original Soyuz 7K-OK upgraded for the military Almaz space stations. The "probe-and-drogue" docking system (left) permitted internal transfer of cosmonauts from the Soyuz to the station.

Two test flights of the 7K-T were conducted prior to committing the redesigned Soyuz to a crewed mission. Kosmos 496 was launched on June 26, 1972 and spent a week in space, part of it in powered-down mode. Then on September 2, an attempted launch of a Zenit reconnaissance satellite failed to orbit due to a malfunction of the vernier engines on the Blok A stage. The existing stock of Soyuz boosters had to be modified to prevent a recurrence of this failure mode on a crewed mission, which delayed the next test until almost a year later when Kosmos 573 launched on June 15, 1973 and spent two days in space. With this done, the way was cleared for the first crewed test, Soyuz 12, in September.

In addition, the standalone flights of Soyuz 13, Soyuz 16, Soyuz 19, and Soyuz 22 used a variant of the 7K-T with solar panels, and in the case of 13 and 22, special camera apparatus in place of the docking mechanism. A large Orion 2 astrophysical camera for imaging the sky and Earth were used on the former and an MKF-6 Zeiss camera on the latter.

Another modification was the Soyuz 7K-T/A9 used for the flights to the military Almaz space station. This featured the ability to remote control the space station and a new parachute system and other still classified and unknown changes.

Missions

Uncrewed tests
  • Cosmos 496
  • Cosmos 573
  • Cosmos 613
  • Cosmos 656
  • Soyuz 20
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