After completing his training, Kolodin served non-flight roles on the Voskhod 2, Soyuz 5, Soyuz 7, Soyuz 11, and Soyuz 12 spaceflights.
The original prime crew for Soyuz 11 consisted of Alexei Leonov, Valeri Kubasov and Pyotr Kolodin.
Soyuz | Soyuz TMA-8 | Soyuz TM-7 | Soyuz-2 | Soyuz 12 | Soyuz 11 | Soyuz TMA-9 | Soyuz TMA-7 | Soyuz TMA-07M | Soyuz TMA-06M | Soyuz TM-32 | Soyuz TM-31 | Soyuz TM-18 | Soyuz (spacecraft) | Soyuz (rocket family) | Soyuz Molodyozhi | Soyuz 37 | Soyuz 32 | Soyuz 31 | Military Soyuz | Apollo–Soyuz Test Project | Apollo-Soyuz Test Project |
He trained as test engineer to fly on Soyuz 11 to visit the Salyut 1 space station, but the entire crew was bumped when it was suspected that flight engineer Valeri Kubasov had contracted tuberculosis.