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 return to Earth before their ferry’s batteries became depleted. Engineers theorized that the Salyut 6 forward port might have been damaged during ascent, or that the Soyuz 25 docking unit was at fault. If the latter was true (and they could not be certain, because the docking unit was discarded before reentry, along with the Soyuz 25 orbital module), then it was possible that the several hard docking attempts had damaged the Salyut 6 forward port, making it unfit for future dockings.
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2.7.3.1 Salyut 6 Principal Expedition 1
Yuri Romanenko, Georgi Grechko Crew code name—Tamyr Launched in Soyuz 26, December 10, 1977 Landed in Soyuz 27, March 16, 1978 96 days in space {|cellspacing=5 border="0"
 * width="25px" align="left" valign="top" rowspan="2" |
 * width="195px" align="left" valign="top" rowspan="2" |[[image:F-S6F.png]]
 * width="250px" align="left" valign="top"|Soyuz 27 • Salyut 6 • Soyuz 26
 * width="305px" align="right" valign="top"|January 11-16, 1978
 * width="555px" align="left" valign="top" colspan="2" |Soyuz 27 arrives at Salyut 6. The Soviets hurried to take advantage of the undamaged Salyut 6 forward port. Soyuz 27 docked without incident at the front port carrying cosmonauts Oleg Makarov and Vladimir Dzhanibekov, who formed the first Visiting Expedition crew in the Soviet space station program (or, for that matter, in any space station program). For the docking, the Tamyrs withdrew to their Soyuz 26 spacecraft and sealed the hatch into Salyut 6 behind them. This was done in the event of a depressurization emergency associated with the docking of Soyuz 27. There was also some concern that
 * width="555px" align="left" valign="top" colspan="2" |Soyuz 27 arrives at Salyut 6. The Soviets hurried to take advantage of the undamaged Salyut 6 forward port. Soyuz 27 docked without incident at the front port carrying cosmonauts Oleg Makarov and Vladimir Dzhanibekov, who formed the first Visiting Expedition crew in the Soviet space station program (or, for that matter, in any space station program). For the docking, the Tamyrs withdrew to their Soyuz 26 spacecraft and sealed the hatch into Salyut 6 behind them. This was done in the event of a depressurization emergency associated with the docking of Soyuz 27. There was also some concern that