Launch from the Baikonur Cosmodrome; landing
48 km southwest of Tselinograd.
Soyuz 15 was to conduct the second phase
of manned operations aboard the Salyut 3 military space
The spacecraft arrived at the Salyut 3 space station
successfully, but the cosmonauts were unable to dock, because of a fault
in the automated docking-system (Igla). The Soyuz spacecraft had no reserves or
backup systems for repeated manual docking attempts, so the mission had to be
abandoned. Later on the state commission discovered that the Igla docking
system of the Soyuz needed serious modification. This could not be completed
before Salyut 3 decayed.