Soyuz 7KT-OK
Encyclopedia
The Soyuz 7KT-0K is an early variant of the Soyuz spacecraft intended to transport crews to and from the Salyut 1
Salyut 1
Salyut 1 was the first space station of any kind, launched by the USSR on April 19, 1971. It was launched unmanned using a Proton-K rocket. Its first crew came later in Soyuz 10, but was unable to dock completely; its second crew launched in Soyuz 11 and remained on board for 23 days...

 space station
Space station
A space station is a spacecraft capable of supporting a crew which is designed to remain in space for an extended period of time, and to which other spacecraft can dock. A space station is distinguished from other spacecraft used for human spaceflight by its lack of major propulsion or landing...

. It flew in space only twice.

Design

The Soyuz 7KT-OK was a modification of the Soyuz 7K-OK
Soyuz 7K-OK
The manned Soyuz spacecraft can be classified into design generations. Soyuz 1 through Soyuz 11 were first-generation vehicles, carrying a crew of up to three without spacesuits and distinguished from those following by their bent solar panels and their use of the Igla automatic docking navigation...

, the differences between the two being a crew transfer tunnel and a newer lightweight docking system.

The spacecraft could have been a derivative of the Soyuz 7K-TK transport spacecraft.

Flights

The Soyuz 7KT-OK flew only twice, Soyuz 10
Soyuz 10
Soyuz 10 was a 1971 Soviet manned mission to the world's first space station, Salyut 1. The docking was not successful and the crew returned to Earth without having entered the station.-Mission highlights:Soyuz 10 was launched 23 April 1971...

 and Soyuz 11
Soyuz 11
Soyuz 11 was the first manned mission to arrive at the world's first space station, Salyut 1. The mission arrived at the space station on June 7, 1971 and departed on June 30, 1971. The mission ended in disaster when the crew capsule depressurized during preparations for re-entry, killing the...

.

On its maiden flight, the 7KT-OK successfully launched into earth orbit, but failed to dock completely with the Salyut 1
Salyut 1
Salyut 1 was the first space station of any kind, launched by the USSR on April 19, 1971. It was launched unmanned using a Proton-K rocket. Its first crew came later in Soyuz 10, but was unable to dock completely; its second crew launched in Soyuz 11 and remained on board for 23 days...

space station. Upon reentry, the spacecraft encountered problems with toxic fumes.

On its second flight, the spacecraft achieved the first successful docking with the world's first space station, Salyut 1. All three mission crew, however, were killed upon reentry due to a faulty seal on the spacecraft that allowed air to escape the Soyuz.
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