science

Soyuz T-12

Soyuz T-12 is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Soyuz T-12 rather than just read about it. In short: Soyuz T-12 (also known as Salyut 7 EP-4) was the seventh crewed spaceflight to the Soviet space station Salyut 7. The name "Soyuz T-12" is also the name of the spacecraft used to launch and land the mission's three-person crew.

Key takeaways

Soyuz T-12 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Soyuz T-12 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Soyuz T-12 from memory before moving on to harder problems.

Reference excerpt

Soyuz T-12 (also known as Salyut 7 EP-4) was the seventh crewed spaceflight to the Soviet space station Salyut 7. The name "Soyuz T-12" is also the name of the spacecraft used to launch and land the mission's three-person crew. The mission occurred in July 1984, during the long-duration expedition Salyut 7 EO-3. During the mission, crew member Svetlana Savitskaya became the first woman to ever perform a spacewalk, and the potential Buran space shuttle pilot, Igor Volk, was given spaceflight experience. Unlike many Soyuz visiting missions, the Soyuz lifeboats were not swapped, and the crew returned to Earth in the same spacecraft in which they launched.

Background Igor Volk was a test pilot, and was planned to be the commander of the first Buran spaceflight. The rule introduced following the Soyuz 25 failure insisted that all Soviet spaceflight must have at least one crew member who has been to space before. As a result, it was decided that Volk should have spaceflight experience, and he was originally scheduled to visit Salyut 7 in 1983. But following the failure of Soyuz T-8 to dock to Salyut 7, in April 1983, the Soyuz launch schedule was disrupted, and Volk's original crew members, Kizim and Solovyov, were rescheduled elsewhere. They later became long-duration crew members of Salyut 7 EO-3, and Volk was scheduled to fly in the passenger seat of the visiting mission Soyuz T-12 to the EO-3 crew, but the other members of the T-12 mission were not yet decided. In November 1983, NASA announced that during STS-41-G, Kathryn D. Sullivan would become the first woman to perform a spacewalk. The NPO Energia chief decided that the Soviets would get there first, and assembled the Soyuz T-12 crew within a month of NASA's announcement, which included Volk as previously planned. The back-up crew lists became available to Western space analysts in 1988, and they noted that the back-up crew contained a woman, but did not contain another LII test pilot. Judging from this, it appeared that, as reasons to have the Soyuz T-12 mission, achieving the first female spacewalk was more important than gaining experience for a potential Buran crew member. At the time of the mission the Buran program was still a state secret. The appearance of Volk as a crew member caused some, including the British Interplanetary Society magazine Spaceflight, to ask why a test pilot was occupying a Soyuz seat usually reserved for researchers or foreign cosmonauts.

Crew

Backup crew

Mission parameters Mass: 7020 kg Perigee: 192 km Apogee: 218 km Inclination: 51.6° Period: 88.6 minutes

Mission highlights Soyuz T-12 was the 7th expedition to Salyut 7. Volk was a glimpse of things which might have been: he was a Buran programme program pilot being flown in space to prove he would be able to pilot Buran back to Earth after an extended stay in space. The crew of Soyuz T-12 (callsign Pamir), the second Visiting Expedition to visit the Mayaks, included veteran cosmonaut Vladimir Dzhanibekov, Buran shuttle program cosmonaut Igor Volk, and Svetlana Savitskaya. On July 25 Dzhanibekov and Savitskaya performed a 3 hr, 30 min EVA (Savitskaya became the first woman ever to perform an EVA), during which they tested the URI multipurpose tool. They cut, welded, soldered, and coated metal samples. During the Pamirs' stay, the six cosmonauts aboard Salyut 7 also conducted Rezonans tests and collected station air samples.

References

Illustrations

Worked examples

Example 1 — a first encounter with Soyuz T-12

Start with the simplest possible case. Write down what Soyuz T-12 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Soyuz T-12 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Soyuz T-12 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Soyuz T-12

In research: Soyuz T-12 appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Soyuz T-12 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Soyuz T-12 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1984 in spaceflight, 1984 in the Soviet Union, Crewed Soyuz missions, so understanding it makes those chapters shorter.
In everyday life: Look for Soyuz T-12 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Soyuz T-12 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Soyuz T-12 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Soyuz T-12 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Soyuz T-12 in simple terms?

Why does Soyuz T-12 matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Soyuz T-12?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Soyuz T-12.