Mars M-69 No.522, a Soviet Mars orbiter built by NPO Lavochkin, launched on a Proton-K/Blok D from Baikonur Site 81/24; a first-stage engine failure about 30 s after liftoff caused the rocket to crash near the pad.
- Outcome
- Failure
- Orbit
- Mars
- Payload to orbit
- Did not reach orbit
- Flight
- 12th
- of 38 Proton / UR-500 K/D flights
- Date and time
- 2 April 1969, 10:33 UTC
- Rocket
- Proton / UR-500 K/D
- Builder
- Khrunichev
- Launch site
- 81/24 (81P), Baikonur Cosmodrome, Republic of Kazakhstan
- Payload
- Robotic Exploration
- Launches in 1969
- 38th of 125