Launched three GLONASS navigation satellites (Cosmos 2139, 2140, and 2141) into medium Earth orbit on a single Proton-K/DM-2, expanding the Soviet Union's global positioning constellation for military and civil use.
- Outcome
- Success
- Orbit
- MEO
- Medium Earth orbit
- Payload to orbit
- 3.9 T
- Flight
- 49th
- of 110 Proton K/DM-2 flights
- Date and time
- 4 April 1991, 10:47 UTC
- Rocket
- Proton K/DM-2
- Builder
- Khrunichev
- Launch site
- 200/39 (200L), Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Navigation
- International designator
- 1991-025
- Launches in 1991
- 25th of 91
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