Spacewalkers Replace Station Gyroscope, 3 Days Added to Shuttle Mission

Aug 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: Sandblasting winds shift Mars' landscape

add to favorites email to friend print save as pdf

Related Stories

SpaceX's next cargo launch set for Sept 20

Sep 12, 2014

SpaceX's next unmanned cargo trip to restock supplies at the International Space Station is scheduled for September 20, the US space agency said Friday.

Recommended for you

Sandblasting winds shift Mars' landscape

3 hours ago

High winds are a near-daily force on the surface of Mars, carving out a landscape of shifting dunes and posing a challenge to exploration, scientists said Tuesday.

PanSTARRS K1, the comet that keeps going

6 hours ago

Thank you K1 PanSTARRS for hanging in there! Some comets crumble and fade away. Others linger a few months and move on. But after looping across the night sky for more than a year, this one is nowhere near ...

NASA rocket has six minutes to study solar heating

8 hours ago

(Phys.org) —On Sept. 30, 2014, a sounding rocket will fly up into the sky – past Earth's atmosphere that obscures certain wavelengths of light from the sun—for a 15-minute journey to study what heats ...

Cassini watches mysterious feature evolve in Titan sea

23 hours ago

(Phys.org) —NASA's Cassini spacecraft is monitoring the evolution of a mysterious feature in a large hydrocarbon sea on Saturn's moon Titan. The feature covers an area of about 100 square miles (260 square ...

User comments : 0