|Mission type||Salyut 7 resupply|
|Spacecraft type||Progress 7K-TG|
|Start of mission|
|Launch date||19 July 1985, 13:05UTC|
|Launch site||Baikonur 1/5|
|End of mission|
|Decay date||30 August 1985, 01:20UTC|
|Perigee||354 kilometres (220 mi)|
|Apogee||358 kilometres (222 mi)|
|Docking with Salyut 7|
|Docking date||21 July 1985, 15:05 UTC|
|Undocking date||28 August 1985|
|Time docked||1 month|
|Docking with Salyut 7|
|Docking date||28 August 1985|
|Undocking date||28 August 1985, 21:50 UTC|
Kosmos-1669 was launched by a Soyuz-U carrier rocket from Site 1/5 at the Baikonur Cosmodrome, at 13:05 UTC on 19 July 1985. The spacecraft docked with the aft port of Salyut 7 at 15:05 UTC on 21 July. Following undocking on 28 August, it moved away from the station, before returning and redocking to test the reliability of the docking system. It undocked for a second time at 21:50 UTC, and was deorbited on 30 August, with the spacecraft burning up over the Pacific Ocean at 01:20 UTC.
Kosmos-1669 was the second cargo spacecraft (after Progress 24) to visit Salyut 7 after its reactivation, and also the last Progress flight as part of the Salyut programme. It delivered new spacesuits, to replace ones damaged by cold temperatures whilst Salyut 7 was deactivated, as well as replacement parts and consumables. This Progress mission was followed by one last cargo mission to Salyut 7, but carried out by an TKS spacecraft: TKS-4, which would become the fourth and last flight of an TKS craft. The next following mission of a Progress cargo craft, Progress 25, flew to Mir.
As of 2009, Kosmos-1669 is the only Progress spacecraft to have received a Kosmos designation, which are usually reserved for military, experimental and failed spacecraft. It has been reported that this may have been an error due to confusion with a TKS spacecraft which later became Kosmos 1686, or that the spacecraft may have gone out of control shortly after launch, but then been recovered after the Kosmos designation had been applied. Alternatively, it could have been given the designation as it was used to test modifications that would be used on future Progress missions. Some news agencies reported that it was a free-flying Progress-derived spacecraft, or that it was a new type of spacecraft derived from the Progress.
- Wade, Mark. "Progress". Encyclopedia Astronautica. Retrieved 2009-04-11.
- Christy, Robert. "Third Expedition to Salyut 7 - 1984". Zarya. Retrieved 2009-04-11.
- Portree, David S. F (March 1995). "Mir Hardware Heritage". NASA. Retrieved 2009-04-11.
- Christy, Robert. "Fourth Expedition to Salyut 7 - 1985". Zarya. Retrieved 2009-04-11.
- "New Soviet Craft Docks With Salyut". New York Times. 1985-07-23. Retrieved 2009-04-11.