Digital Soyuz Issues Arise (Update)

Digital Soyuz Return Could Be Rocky, Jim Oberg, IEEE Spectrum

"The new "digital" version of the Soyuz spacecraft is having some decidedly analog problems on its maiden voyage. Astronauts will test on-orbit repairs done to its troubled control systems ahead of a scheduled landing next Wednesday. The tests will determine whether the Soyuz can perform a gentle guided descent or instead must rely on a backup emergency "ballistic" landing, involving a much rougher deceleration and landing several hundred kilometers short of the main recovery zone. ... NASA quietly disclosed the situation Thursday on its website in a routine and little read daily "On-Orbit Status Report" for the International Space Station."

NASA ISS On-Orbit Status 10 March 2011

Roscosmos: Soyuz TMA-21 Launch Delayed Due to "Glitch"

"Roscosmos Board held a meeting today to discuss the report by Technical Management on Human Space System Flight Testing. The report mentioned an incompliance in operation of the Kvant-V equipment in Soyuz TMA-21 detected during launch campaign at Baikonur. Taking into account the necessity to run additional analysis of the glitch, Soyuz TMa-21 launch is postponed. Failure of a condenser is blamed for the glitch in Kvant-V."

Soyuz TMA-M ballistic return possible, Interfax

"The first modernized manned spaceship Soyuz TMA-M may have a ballistic landing on Wednesday, NASA said. Soyuz TMA-M commander Alexander Kaleri will test angular speed sensors after the ship undocks from the International Space Station (ISS). The other crewmembers of Soyuz TMA-M are Oleg Skripochka and Scott Kelly. If a problem occurs, the astronauts may experience G8 to G10 in the ballistic return, NASA said. Astronauts experience G3 to G4 in the case of a regular return. NASA explained the planned check of angular speed sensors with the failure of the landing capsule's analog signal processing system, which happened on October 9, 2010, on the second day of Soyuz TMA-M's flight to the ISS. As a result, data from angular speed sensors stopped being displayed on the Neptun-ME console."

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This page contains a single entry by Keith Cowing published on March 14, 2011 8:31 AM.

NASA's Contingent at SXSW: Lessons Learned - For The Rest of Us? was the previous entry in this blog.

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