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 station.
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