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Upper Stage Issue Causes Arianespace Launch Failure, Costing 2 Satellites

upstart writes in with an IRC submission for SoyCow0495:

Upper stage issue causes Arianespace launch failure, costing 2 satellites:

An overnight launch of Arianespace's Vega rocket failed after reaching space, costing France and Spain an Earth-observing satellite each. The failure represents the second in two years after Vega had built up a spotless record over its first six years of service.

[...] Something went wrong with the liquid-fueled [fourth] stage after it had reached an altitude of over 200km. While it's not entirely clear at the time what had failed, in the words of Arianespace CEO Stéphane Israël, "The speed was not nominal anymore." This caused the upper stage and satellites to veer off the planned trajectory, and Arianespace lost control of the vehicle shortly afterward. The spacecraft returned to Earth near where the upper stage was expected to fall in an area that's completely uninhabited.

The failure happened at a stage of the launch where Arianespace is able to obtain detailed telemetry data from tracking stations in North America.

[...] The company's initial investigation focused on the engine of the liquid-fueled fourth stage, specifically "a problem related to the integration of the fourth-stage AVUM nozzle activation system," which was "the most likely cause of the loss of control of the launcher." Arianespace has already named a European Space Agency official who will head the inquiry into the failure, which will focus on why the problem wasn't caught and corrected prior to launch.

Bad Cabling Blamed for Failed Launch of European Satellites

upstart writes in with an IRC submission for Runaway1956_:

Bad cabling blamed for failed launch of European satellites:

The European Space Agency said the Vega carrier rocket deviated from its trajectory eight minutes after liftoff from Kourou, in French Guiana, late Monday.

France-based Arianespace said an initial investigation showed the first [three] stages of the Vega launch vehicle had functioned as planned. When the final stage of the rocket—known as AVUM—ignited, the spacecraft tumbled off course, leading to a "loss of mission," it said.

"A problem related to the integration of the fourth-stage AVUM nozzle activation system is the most likely cause of the loss of control of the launcher," Arianespace said.

The company's chief technical officer, Roland Lagier, said data indicated the issue was down to wrongly installed cables in a system controlling the thrusters.

He blamed quality control and "a series of human errors," for the problem.

Vega Rocket Failure Apparently Caused by Human Error

upstart writes in with an IRC submission for SoyCow0495:

Vega Rocket Failure Apparently Caused by Human Error:

An Arianespace Vega rocket carrying two satellites failed to reach orbit yesterday after experiencing a catastrophic failure eight minutes into the launch. Officials are attributing the loss of the rocket to a “series of human errors.”

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