STS-100, Mission Control Center
Status Report # 17
Friday, April 27, 2001 5:30 a.m. CDT

Flight controllers worked successfully overnight troubleshooting computer problems on board the International Space Station and plan to continue a recovery of full computer operations on the complex today. The station and shuttle crews awoke this morning to find most of the station's computers operating well and on line, although efforts are continuing to bring up the orbiting outpost's backup computers.

The crew today will assist with bringing the remaining station computers on line, including swapping a backup payload computer for one of the station's three command and control computers. Of the three station command and control computers, one is on line and fully functional, providing full computer operations aboard the station. The other two, which should serve as backups to the primary computer, are off-line. Today's activities are planned to bring them on line as well. The swap of one of those off-line command and control computers with the backup payload computer will correct what is believed to be a failed hard drive in that unit. The other off-line command and control computer has been loaded with new software from the ground that should correct its operating problems, although flight controllers have not yet rebooted the unit.

In addition to the station computer troubleshooting, the station and shuttle crews today will continue to concentrate on the transfer of supplies and equipment from the shuttle to the station. They also plan to close the Raffaello logistics carrier's hatch and later detach that module, using the shuttle's robotic arm to reberth it in Endeavour's bay for a return to Earth. Almost 4,000 pounds of equipment and supplies were unloaded from Raffaello onto the station. Yesterday, the crew completed reloading it with items bound for Earth. The shuttle is planned to boost the station's altitude by about 2.5 statute miles today as well, the second such boost during the mission thus far.

Managers have added an extra day to Endeavour's mission and are now planning to have the shuttle remain docked to the station until Sunday with a landing on Tuesday. A further extension of the mission also may be considered. The crew of Endeavour was awakened this morning to the song "Buckaroo," sung by Don Cain of Dubuque, Iowa, father of STS-100 Ascent and Entry Flight Director Leroy Cain. Except for the station computer problems now being resolved, flight controllers have identified no significant problems with any of the station or shuttle systems. The next mission status report will be issued later today.


NASA Johnson Space Center Mission Status Reports and other information are available automatically by sending an Internet electronic mail message to In the body of the message (not the subject line) users should type "subscribe hsfnews" (no quotes). This will add the e-mail address that sent the subscribe message to the news release distribution list. The system will reply with a confirmation via e-mail of each subscription. Once you have subscribed you will receive future news releases via e-mail.