Proton M/Briz M
Launch vehicle Proton M/Briz M
Launch site Baikonur, Kazakhstan
Date/Time 2007-09-05 22:43 UTC
Description First/second stage separation failure
Cause Damaged cable
Payload JCSAT 11
Desired orbit 5,032 km x 35,768 km x 21.4 degrees geostationary transfer orbit


The rocket experienced a second-stage separation failure and engine shutdown 139 seconds into flight. It crashed down in the central Kazakh steppe.

The Russian State Commission investigating the unsuccessful launch determined that a damaged pyro firing cable on the interstage truss prevented the activation of the pyro bolts that were to have separated the first and second stages of the rocket. This led to an emergency shutdown of the engine and the subsequent crash.

Last updated: 27 October 2007

Launch Failures Chronology