Failed on the debut flight of the Briz-M upper stage: a weld defect in the Proton's second-stage turbopump caused an engine failure roughly 280 seconds into flight, destroying the vehicle and its Raduga military communications satellite payload for the Russian Ministry of Defense; wreckage fell in Kazakhstan's Karaganda region.
- Outcome
- Failure
- Orbit
- Direct-GEO
- Geostationary orbit
- Payload to orbit
- Did not reach orbit
- Flight
- 1st
- of 4 Proton-K/Briz-M flights
- Date and time
- 5 July 1999, 13:32 UTC
- Rocket
- Proton-K/Briz-M
- Builder
- Khrunichev
- Launch site
- 81/24 (81P), Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Communications
- Launches in 1999
- 37th of 78