Soyuz 34

Salyut 6 In Space - Credit: RKK Energia.

• Checked the operation of the spacecraft propulsion unit; transportated the crew of the Salyut-6 station back to earth.
• Unmanned Soyuz 34 docked with Soyuz 32 - Salyui 6 (2nd airlock) on 1979 Jun 8.83 to provide return vehicle for Soyuz 32 crew of Lyakhov/Ryumin after Soyuz 33 primary propulsion system failure. (Progress 6 had vacated the 2nd airlock on Jun 8.33, for de-orbiting the next day).
• On 1979 Jun 14.68 Soyuz 34 was detached from 2nd airlock and re-attached to lst airlock.(Soyuz 32 had vacated the lst airlock on Jun 13, prior to unmanned recovery.) Soyuz 34 landed carrying the Soyuz 32 cosmonauts, with a manned duration record of 175.02 days.

Astrophilately covers:

Launch cancel Baikonur.

Undocking cancel Baikonur, with the Soyuz 32 crew Lyakhov & Ryumin signed.

Undocking cancel Baikonur.