A Soyuz-U carrying the classified Yantar-4KS1 No. 11 reconnaissance satellite failed during ascent from Plesetsk, destroying the payload before it reached orbit.
- Outcome
- Failure
- Orbit
- LEO
- Low Earth orbit
- Payload to orbit
- Did not reach orbit
- Flight
- 523rd
- of 714 Soyuz U flights
- Date and time
- 11 November 1988, 10:30 UTC
- Rocket
- Soyuz U
- Builder
- Progress RSC
- Launch site
- 1/5, Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Government/Top Secret
- Launches in 1988
- 104th of 121