After astronaut Danny Olivas repaired a small portion of Atlantis’ thermal blanket during Friday’s spacewalk, the shuttle was cleared for the return flight to the Earth. But not before a fourth and final spacewalk.

The shuttle will undock from the ISS on Tuesday and return to Earth Thursday. Suni Williams, who on Saturday became the longest- ever woman serving in space, will be among the seven-member crew making the flight back.

As for Sunday's spacewalk it was added to the crew's schedule during the week. Problems retracting an old solar panel, the protruding thermal blanket and a bizarre malfunction of Russian computers on the ISS have distracted the astronauts from their main goal of installing a new set of solar panels brought up with Atlantis.

The six Russian command and control computers that help keep the orbiting space station in place were up and running again after cosmonauts used a jumper cable bypass to get four of them working again on Friday.

"Currently, they have all six computers up while we do some additional troubleshooting to understand the environment and how it affects the computers," ISS Program Manager Mike Suffredini said Saturday.

"The bottom line is it appears to everyone that the command and control type computers are functioning just fine," Suffredi added.

Early Saturday morning, Mission Specialist Suni Williams set the record for the longest-duration single spaceflight by a woman. Williams passed the previous record of 188 days, 4 hours at 1:47 a.m. as STS-117 and Expedition 15 crew members slept aboard Atlantis and the station.