Launch from the Baikonur Cosmodrome and
landing 200 km southeast of Dzheskasgan.
Soyuz T-2 was a manned
test flight of the new
developed
Soyuz T spacecraft. The craft had new engine
systems and could launch three cosmonauts. Additionally, the
Soyuz was equipped with a new Argon computer which
controlled docking and reentry procedures. Six unmanned spacecraft of this new
type had been tested before. Following a one-day solo flight
Soyuz T-2 docked with the
Salyut 6 space station on June 06, 1980 and common
work with the
fourth resident crew followed.
The main goal of this
flight was the testing and development of onboard systems in the improved
Soyuz T series transport vehicle under piloted
conditions. As the craft approached
Salyut 6, solar cells, re-introduced to the
Soyuz, were tested. The approach was completed
automatically, while the final 180 meters were achieved manually on June 06,
1980. The Argon docking computer had failed, leaving the craft perpendicular to
the station. The computer failure was later explained as being caused by the
crew and controllers failing to have practiced the particular approach the
computer chose. The crew had therefore chosen to dock manually to be safe; the
computer would have successfully docked if allowed to, said the Soviets.
However, failures during the automatic approach was a recurring problem in
future
Soyuz T missions.
During their short stay, Yuri
Malyshev and Vladimir
Aksyonov seemed to have carried out a minimum of experiments,
including participating in some medical tests and using the
Salyut's
MKF-6M camera. They undocked in the craft they arrived
on only two days after first greeting the resident crew. As they left, the
Salyut turned around and the
Soyuz T-2 crew photographed and visually inspected the
space station. The
Soyuz then departed and landed about three hours
later.
The
Soyuz spacecraft is composed of three elements
attached end-to-end - the Orbital Module, the Descent Module and the
Instrumentation/Propulsion Module. The crew occupied the central element, the
Descent Module. The other two modules are jettisoned prior to re-entry. They
burn up in the atmosphere, so only the Descent Module returned to Earth.
The
deorbit burn lasted about 3 to 4 minutes. Having shed two-thirds of its mass,
the
Soyuz reached Entry Interface - a point 400,000 feet
(121.9 kilometers) above the Earth, where friction due to the thickening
atmosphere began to heat its outer surfaces. With only 23 minutes left before
it lands on the grassy plains of central Asia, attention in the module turned
to slowing its rate of descent.
Eight minutes later, the spacecraft was
streaking through the sky at a rate of 755 feet (230 meters) per second. Before
it touched down, its speed slowed to only 5 feet (1.5 meter) per second, and it
lands at an even lower speed than that. Several onboard features ensure that
the vehicle and crew land safely and in relative comfort.
Four parachutes,
deployed 15 minutes before landing, dramatically slowed the vehicle's rate of
descent. Two pilot parachutes were the first to be released, and a drogue chute
attached to the second one followed immediately after. The drogue, measuring 24
square meters (258 square feet) in area, slowed the rate of descent from 755
feet (230 meters) per second to 262 feet (80 meters) per second.
The main
parachute was the last to emerge. It is the largest chute, with a surface area
of 10,764 square feet (1,000 square meters). Its harnesses shifted the
vehicle's attitude to a 30-degree angle relative to the ground, dissipating
heat, and then shifted it again to a straight vertical descent prior to
landing.
The main chute slowed the
Soyuz to a descent rate of only 24 feet (7.3 meters)
per second, which is still too fast for a comfortable landing. One second
before touchdown, two sets of three small engines on the bottom of the vehicle
fired, slowing the vehicle to soften the landing.