Spacewalkers Replace Station Gyroscope, 3 Days Added to Shuttle Mission

August 13, 2007
Spacewalkers at Work to Replace Station Gyro
Astronaut Rick Mastracchio holds the failed control moment gyro shortly after its removal from the Z1 truss. Image: NASA TV

STS-118 spacewalkers Dave Williams and Rick Mastracchio installed a new control moment gyroscope (CMG) into the International Space Station’s Z1 truss. They will secure the faulty CMG and equipment before wrapping up the excursion.

The new CMG replaced a faulty gyroscope, which was removed during the first half of the spacewalk. The failed gyro will remain at its temporary stowage location on the station’s exterior before it is returned to Earth on a later shuttle mission. The new gyroscope is one of four CMGs that are used to control the station’s attitude in orbit.

The excursion began 11:32 a.m. EDT. Mission Specialist Tracy Caldwell is serving as the spacewalk coordinator, and STS-118 Pilot Charles Hobaugh and Expedition 15 Flight Engineer Clay Anderson are operating the station’s robotic arm. The spacewalk is scheduled to wrap up about 6 p.m.

Meanwhile, crew members are transferring cargo between Endeavour and the station. Experts on the ground continue to analyze imagery collected Sunday during the STS-118 crew’s focused inspection of five areas of concern on the Endeavour’s heat shield.

Managers Add Three Days to Shuttle Mission

Mission managers decided Sunday to extend the STS-118 mission by three days. The decision came after the successful operation of the new Station-to-Shuttle Power Transfer System (SSPTS).

Endeavour is now scheduled to undock from the International Space Station on Aug. 20 and land Aug. 22. In addition to the extra time at the orbital outpost, managers added a fourth spacewalk that is scheduled to take place Aug. 17.

The SSPTS reroutes power from the space station to the shuttle during docked operations, allowing the orbiter to conserve materials needed to generate power and spend more time in space.

Source: NASA

Explore further: Walk the line: NASA studies physical performance after spaceflight

Related Stories

Fortifying computer chips for space travel

September 7, 2015

Space is cold, dark, and lonely. Deadly, too, if any one of a million things goes wrong on your spaceship. It's certainly no place for a computer chip to fail, which can happen due to the abundance of radiation bombarding ...

First Dane in space arrives at ISS

September 4, 2015

The first Dane in space arrived on Friday at the International Space Station (ISS) as part of a three-man team after an unusually long voyage from Earth, the Russian space agency said.

Recommended for you

Blue skies, frozen water detected on Pluto

October 8, 2015

Pluto has blue skies and patches of frozen water, according to the latest data out Thursday from NASA's unmanned New Horizons probe, which made a historic flyby of the dwarf planet in July.

Orbiter views Mars surface fractures

October 8, 2015

The High Resolution Imaging Science Experiment (HiRISE) camera aboard NASA's Mars Reconnaissance Orbiter often takes images of Martian sand dunes to study the mobile soils. These images provide information about erosion and ...

How to prepare for Mars? NASA consults Navy sub force

October 5, 2015

As NASA contemplates a manned voyage to Mars and the effects missions deeper into space could have on astronauts, it's tapping research from another outfit with experience sending people to the deep: the U.S. Navy submarine ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.