Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
. Space Travel News .

ISS Crew Set for Tuesday Pump Replacement Spacewalk
by Staff Writers
Houston TX (SPX) Dec 24, 2013

Flight Engineer Rick Mastracchio works outside the International Space Station during Saturday's spacewalk to remove a degraded ammonia pump. Image Credit: NASA TV.

Two Expedition 38 crew members are set to head out of the Quest airlock Tuesday for the second in a series of spacewalks to replace a degraded ammonia pump module on the International Space Station's starboard truss.

Flight Engineers Rick Mastracchio and Mike Hopkins, who completed a 5-hour, 28-minute spacewalk Saturday to remove the faulty pump module from the starboard truss, spent their Monday preparing for the Christmas eve excursion slated to begin at 7:10 a.m. EST.

The two spacewalkers will retrieve a spare pump module from an external stowage platform and install it in the currently vacated slot to restore full cooling capability for the complex. The pump module removed by Mastracchio and Hopkins Saturday encountered a problem Dec. 11 with its internal flow control valve, causing temperatures in the station's cooling lines to drop.

During repressurization of the Quest airlock at the conclusion of Saturday's spacewalk, a spacesuit configuration issue put Mastracchio's suit in question for the second spacewalk. A small amount of water entered the suit's sublimator -- the cooling system of the suit itself -- after the two astronauts had already hooked themselves up to airlock umbilicals. As a result, flight controllers decided to switch to a backup suit for Mastracchio for the next spacewalk.

This issue is not related to the spacesuit water leak that was seen during a July spacewalk by European Space Agency astronaut Luca Parmitano and NASA's Chris Cassidy. Both Mastracchio and Hopkins reported dry conditions repeatedly throughout Saturday's activities and the two were never in danger.

Mastracchio and Hopkins resized other suits in the Quest airlock Sunday while allowing the suit Mastracchio wore Saturday to dry out. That spacesuit will be returned to service in a future spacewalk.

After preparing spacewalking tools and configuring the crew equipment lock of the Quest airlock Monday, the two NASA astronauts joined up with Flight Engineer Koichi Wakata of the Japan Aerospace Exploration Agency to review the spacewalk's procedures. Wakata will again be in control of the station's robotic arm, Canadarm2, this time with Hopkins attached to the foot restraint at the end of the 57-foot arm.

During Tuesday's spacewalk Mastracchio and Hopkins will retrieve the spare pump module from External Stowage Platform 3 and install it in the slot that is now empty through the removal of the degraded pump Saturday. After the spacewalkers complete five electrical connections and four fluid connections, activation of the pump will restore full dual-loop cooling capability for the station.

Mastracchio will be wearing a suit marked with red stripes. Hopkins will wear a suit with no stripes. This will be the 176th spacewalk in support of space station assembly and maintenance. It also will be the second Christmas eve spacewalk conducted in history. Fourteen years ago, space shuttle Discovery astronauts Steve Smith and John Grunsfeld conducted an 8-hour, 8-minute spacewalk to install upgrades and new insulation on the Hubble Space Telescope.

If the spacewalk goes as expected Tuesday, all of the pump replacement work should be completed with just two spacewalks. The degraded pump, removed during Saturday's spacewalk, will remain on the Payload Orbital Replacement Unit Accommodation (POA) on the station's railcar, or Mobile Base System. According to flight controllers, the degraded pump can remain on the POA until at least next June, based on a thermal analysis by the ground control team.

The completion of the spacewalk will clear the way for Commander Oleg Kotov and Flight Engineer Sergey Ryazanskiy to conduct their own spacewalk Friday out of the Pirs docking compartment to install a pair of high-fidelity cameras on the Zvezda service module and to refresh several experiment packages on the exterior of the Russian segment of the station.

Flight Engineer Mikhail Tyurin assisted Kotov and Ryazanskiy on Monday with a "dry run" of the spacewalk as the two cosmonauts donned their Russian Orlan spacesuits and entered Pirs to test their suits.


Related Links
Space Station
Station at NASA
Station and More at Roscosmos
S.P. Korolev RSC Energia
Watch NASA TV via Space.TV
Space Station News at Space-Travel.Com

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

Spacesuit flaw postpones station repairs to Dec 24
Washington (AFP) Dec 22, 2013
A new flaw has emerged in a US-made spacesuit, forcing NASA to delay until Christmas Eve the next outing to repair the International Space Station, the space agency said Saturday. The problem came up in the cooling unit of veteran astronaut Rick Mastracchio's spacesuit after he re-entered the space station airlock following a spacewalk that lasted 5.5 hours, NASA said. It was not believe ... read more

Orbital Launches Completes 40th Consecutive Successful Suborbital Rocket For NASA

NASA Awards Launch Services Contract for InSight Mission

Argentina successfully launches research rocket

Gaia secured inside fairing

Curiosity Team Upgrades Software, Checks Wheel Wear

Opportunity Communications Remain Slow Due To Odyssey Issues

New Views of Mars from Sediment Mineralogy

NASA poised to launch Mars atmosphere probe

NASA Releases New Earthrise Simulation Video

Most Chang'e-3 science tools activated

China's Lunar Lander May Provide Additional Science for NASA Spacecraft

China plans to launch Chang'e-5 in 2017

The Sounds of New Horizons

On the Path to Pluto, 5 AU and Closing

SwRI study finds that Pluto satellites' orbital ballet may hint of long-ago collisions

Archival Hubble Images Reveal Neptune's "Lost" Inner Moon

Using an Atmosphere to Weigh a Planet

Gaia Mission Could Help Map Exoplanets

First detection of a predicted unseen exoplanet

Astronomers solve temperature mystery of planetary atmospheres

SLS Chief Engineer Driven by 'Challenge' of Building America's Next Great Rocket

NASA Engineers Crush Fuel Tank to Build Better Rockets

JPL to Test New Supersonic Decelerator Technology

NASA Engineers Crush Giant Fuel Tank To Improve Rocket Design

China's moon rover continues lunar survey after photographing lander

China's Yutu "naps", awakens and explores

Deep space monitoring station abroad imperative

Chinese sci-fi writers laud moon landing

NASA's Asteroid Hunter Spacecraft Returns First Images after Reactivation

Dawn Creates Guide to Vesta's Hidden Attractions

What happens to ISON's remains?

Fire vs. Ice: The Science of ISON at Perihelion

The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement