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 * width="33.3%" align="left" valign="top" rowspan="1" colspan="1"|
 * backup engine (with KDU system, attitude thrusters can draw on main propellant supply and thereby deorbit Soyuz-T, removing the need for a separate backup main engine).


 * Jettisonable covers for portholes which permitted crew to look out of the spacecraft after reentry. On earlier flights a black coating
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 * formed on the portholes during reentry and prevented crews from looking outside during descent and on the surface.


 * A lighter launch escape system.
 * Improved telemetry capabilities.
 * More powerful land landing system solid rocket motors. This made for a gentler touchdown,
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 * important for the health and safety of the cosmonauts after a long-duration flight.


 * Sufficiently different from the Soyuz Ferry that crews required more than a year of special training to be able to fly it. This accounted in part for the gradual introduction of Soyuz-T, while Soyuz Ferries continued to fly.
 * }

1.12.3 Soyuz-T Mission Descriptions
Dates are launch to landing.

1.12.3.1 Soyuz-T Test Missions
For information on Salyut operations during the Soyuz-T 1 mission, see section 2.7.3.3.







1.12.3.2 Soyuz-T Missions to Salyut 6
For information on Salyut operations during these Soyuz missions, see sections 2.7.3.4 through 2.7.3.6.