Note: Only forum leaders may delete posts.
*HTML is ON *UBB Code is ON Smilies Legend
Smilies Legend
The first of these computer transitions occurred along with a communications dropout at 7:59 Central time this morning and the station flight director advised the other mission control centers of the loss the S-band communications link with the station. Just before 9:00, station commander Jeff Williams called down, once the station had moved back into communications range and confirmed that there had been a failure of the primary and backup command and control computers, or as they are sometimes referred to, "MDMs" for multiplexer-demuliplexer. The team in Houston was working with the crew on-orbit to get things properly reconfigured and just about 9:49 this morning, there was an indication that there was another communications outage and by 9:57 the data was showing that there had been another C&C transition, and at that point computer no. 2 was prime, no. 3 was backup. 10:36 this morning, after once again the station moved back into communications range, Jeff Williams called down, advising that the computer system was down again and once the computers were reconnected, at this point C&C no. 3 was in the primary slot, no. 1 was in the backup slot and no. 2 was in standby, though that most recent transition was not detected by the systems in the Russian segment of the space station. All indications from the crew, as well as the telemetry received, is that all of the life support systems aboard the station are working completely normally but the teams are working through checklists and procedures to identify the cause of the command and control computer transitions.
Currently the computers are all showing they are healthy, computer no. 3 is currently in the prime position, no. 2 is the backup and 1 is in standby. That is a small change from the situation a half-hour ago, when 1 was in backup and 2 was in standby but 3 has remained in the prime position since then.
Contact Us | The Source for Space History & Artifacts
Copyright 1999-2024 collectSPACE. All rights reserved.