Category: Space Shuttle

The Expedition 11 and STS-114 crewmembers. Image credit: NASA Click to enlarge
Despite days of anticipation and intense planning, space-walking astronaut Steve Robinson made it look easy as he gently pulled two protruding gap fillers from between thermal protection tiles on Discovery’s underside Wednesday morning.

“It looks like this big patient is cured,” Robinson told delighted flight controllers.

Fellow spacewalker Soichi Noguchi of the Japan Aerospace Exploration Agency helped Robinson with preparations, and from a perch near the end of a Space Station truss acted as observer and communication relay station between Robinson and astronaut Andy Thomas aboard Discovery. Thomas was the onboard coach and monitor for Robinson and Noguchi throughout the 6-hour 1-minute spacewalk. Discovery Pilot Jim Kelly and Mission Specialist Wendy Lawrence operated the Station’s Canadarm2, which moved Robinson to and from the worksite. Today’s spacewalk, the third of the mission, began at 3:48 a.m. CDT and concluded at 9:49 a.m.

Deputy Space Shuttle Program Manager Wayne Hale, in Wednesday?s afternoon briefing, said ?The crew demonstrated consummate professionalism and coolness beyond belief. They [the gap fillers] came out just as we thought they would. It looked easy but was not, which is a tribute to the crew and the team on the ground that planned it, so we?re proud of that.?

Gap fillers like those Robinson removed today are thin, coated Nextel fabric. The protruding gap fillers were identified in photos taken by Station crewmembers using telephoto lenses as Discovery did a slow back flip about 600 feet below before docking.

During the spacewalk Noguchi and Robinson, helped by the Station’s robotic arm, installed an external stowage platform outside the station that will be used to house spare parts. Noguchi also installed another Materials International Space Station Experiment (MISSE). Like its predecessors, MISSE 5 exposes samples of various materials to the harsh space environment for several months.

In other activities, Kelly worked with Mission Specialist Charlie Camarda on an inspection of the repair demonstration tiles in Discovery’s cargo bay. Using the Orbiter Boom Sensor System, they looked at tiles brought up for an experimental repair by Robinson and Noguchi on the mission’s first spacewalk Saturday.

Station crewmembers, Commander Sergei Krikalev and NASA Science Officer John Phillips, continued to stow equipment and supplies on the Station and Shuttle. Discovery Commander Eileen Collins operated shuttle systems and supervised activities.

Hale also said the only part of Discovery?s heat shield not yet cleared for entry is a bulging thermal blanket below the Shuttle commander?s window. Managers will meet Thursday morning to review tests to help determine whether the blanket might pose a concern for entry.

The next STS-114 mission status report will be issued Thursday morning, or earlier, if events warrant.

Original Source: NASA News Release

Photographed from ISS while docked with Discovery. Image credit: NASA Click to enlarge
The Space Shuttle Discovery crew begins their ninth day in space with preparations for the third spacewalk of the mission. This extravehicular activity (EVA) was a preplanned activity for the mission, but now includes a new task — repair of two protruding gap fillers between tiles on the bottom the Shuttle.

The crew began the day waking up at 10:09 p.m. CDT to “Where My Heart Will Take Me,” the theme song from Star Trek: Enterprise. The song, composed by Dennis McCarthy, was selected for the crew as a surprise dedication from the Deputy Shuttle Program Manager Wayne Hale. The International Space Station Expedition 11 crew of Sergei Krikalev and John Phillips woke 30 minutes later.

Mission Specialists Steve Robinson and Soichi Noguchi are scheduled to begin their third spacewalk at 3:14 a.m. CDT as they exit out of the Space Shuttle airlock. The two will be assisted by Andy Thomas, serving as the intravehicular officer overseeing the spacewalk from inside, as well as Pilot Jim Kelly and Mission Specialists Wendy Lawrence and Charlie Camarda who will be supporting various robotic arm activities throughout the day.

The spacewalk is scheduled to last about 7 hours. The first task entails Kelly and Lawrence maneuvering the External Stowage Platform-2 (ESP-2), via the Station’s robotic arm, which they pulled from Discovery’s payload bay earlier today, onto the Station. As the ESP-2 reaches its final position, Robinson and Noguchi will guide the structure and secure it into place. With that task complete, Lawrence and Kelly will conduct a “walk off” maneuver of the Station robotic arm, by attaching the “free” end to the Mobile Base System and releasing the other end from the Destiny Laboratory module to where it will be needed as a platform for Robinson later in the EVA.

The two spacewalkers will move on to individual tasks, with Noguchi installing the Materials International Space Station Experiment-5 (MISSE-5), a materials experiment that will study the degradation of solar cell samples in the space environment. He’ll then remove the Rotary Joint Motor Controller from the Space Station truss before proceeding to a support position to assist Robinson in his final tasks.

Meanwhile, Kelly will work with Camarda, using the Orbiter Boom Sensor System to inspect repair demonstration tiles inside the Shuttle’s payload bay. Later, Camarda will also work with Krikalev and Phillips to continue stowing supplies and equipment inside Discovery and the Station. Discovery Commander Eileen Collins will monitor and supervise all the activities.

Robinson, now attached to the Station robotic arm, will attempt to repair two tile gap filler protrusions located on the underside of Discovery. He will first try to gently pull out the protruding material, and if need be, remove by trimming with a hacksaw.

Gap fillers are used in areas to restrict the flow of hot gas into the gaps between Thermal Protection System components. They consist of a layer of coated Nextel fabric and are normally about 0.020-inch thick. These protrusions were identified from photos taken during the rendezvous pitch maneuver conducted on flight day three, as Discovery approached the orbiting Space Station.

The crews are scheduled to go to sleep about 2:09 p.m. CDT.

Original Source: NASA News Release

Astronaut Soichi Noguchi. Image credit: NASA Click to enlarge
Space Shuttle mission managers Tuesday cleared Discovery?s wing leading edge heat shield for re-entry as they methodically deal with concerns over the protruding tile gap fillers. The mission management team also discussed a ?puffed out? insulating blanket outside the commander?s cockpit window and has decided it poses no risk of overheating during entry. Engineers will continue to analyze whether it could pose a debris problem if it came loose during aerodynamic flight.

Discovery?s astronauts worked much of today on preparations for Wednesday’s gap filler repair spacewalk. Transfer of materials to and from the International Space Station continued with crewmembers of both spacecraft making good progress.

Spacewalkers Soichi Noguchi and Steve Robinson spent an hour this morning beginning about 2:40 a.m. CDT with Mission Specialists Andy Thomas and Wendy Lawrence, and Pilot Jim Kelly on a review of spacewalk procedures. Thomas, as the intravehicular crewmember, will coach and monitor the spacewalkers, while Lawrence and Kelly will operate the Station’s Canadarm2.

That robotic arm will carry Robinson to the repair sites on the underside of the forward part of Discovery where he will either gently pull out the protruding gap fillers with his hand or with forceps, or remove the protrusions with a hacksaw.

After the procedure review, Lawrence and Kelly spent the subsequent 45 minutes in computer training for the arm tasks, using the Dynamic Onboard Ubiquitous Graphics program, or DOUG. Meanwhile, the spacewalkers and Thomas worked on assembly of the hacksaw that would be used if other methods do not work.

About 7:40 a.m. Lawrence and Kelly, using Canadarm2, unberthed External Stowage Platform 2 from Discovery’s cargo bay. Noguchi and Robinson installed the platform’s attachment device on the mission’s first spacewalk on Saturday, and the platform itself is to be installed on the attachment device during Wednesday’s spacewalk.

After lunch on board, Noguchi, Robinson and Thomas worked on spacewalk tool configuration. Near the end of their work day, all nine crewmembers on board, including Discovery Commander Eileen Collins and Station crewmembers, Commander Sergei Krikalev and NASA Science Officer John Phillips, did a spacewalk review.

The spacewalkers began a prebreathe of pure oxygen about 10:50 a.m., a little more than an hour before hatches linking Discovery and the Station were closed so the Shuttle could be depressurized to 10.2 psi. Both the prebreathe and the depressurization were aimed at reducing the nitrogen content of the spacewalkers’ blood to reduce the possibility of nitrogen bubble formation in their bloodstreams during the spacewalk. Wednesday?s spacewalk is scheduled to begin at about 3:14 a.m. CDT.

Late in the crew day Tuesday, astronauts received a phone call from President George Bush. The President thanked the crew for taking risks for the sake of exploration and wished them well in the remainder of their mission.

Original Source: NASA News Release

Although Discovery made it safely into orbit, potentially catastrophic chunks of foam dislodged from its fuel tank on Tuesday’s launch. After reviewing launch video and photographs, managers identified a few places where pieces of foam flew off the tank, including one piece as large as 90-cm (35 inches) across. Fortunately it completely missed the shuttle, but if it had hit, the damage would have been severe. NASA has grounded all future shuttle flights until the falling foam problem can be made safer.

Space Shuttle Discovery lifts off Launch Pad. Image credit: NASA/KSC Click to enlarge
NASA’s Space Shuttle Return to Flight mission (STS-114) is under way. Space Shuttle Discovery lifted off Tuesday from NASA’s Kennedy Space Center, Fla., at 10:39 a.m. EDT.
“We know the folks on planet Earth are just feeling great right now,” said Discovery’s commander Eileen Collins from orbit.

During their 12-day mission to the International Space Station, Collins and her six fellow astronauts will test new techniques and equipment designed to make Shuttles safer. They’ll also deliver supplies and make repairs to the Space Station after Discovery docks on Thursday.

“I want you to think about what it takes to get millions of different parts from thousands of vendors across the country to work together to produce what you saw here today and to realize how chancy it is, how difficult it is, at what a primitive state of technology it still is,” said NASA Administrator Michael Griffin. “This team managed to do it, and I think a large debt of appreciation is due to them. They have worked as hard as any team in NASA history.”

Discovery’s first launch attempt July 13 was postponed because of problems related to a liquid hydrogen low-level fuel sensor inside the external fuel tank. Hundreds of engineers across the country worked to analyze and understand the issue. The sensor system was repeatedly tested during today’s launch countdown, and it performed without a problem.

The STS-114 Return to Flight mission is the first step in realizing America’s Vision for Space Exploration, which calls for a stepping-stone strategy of human and robotic missions to achieve new exploration goals. The Shuttle will be used to complete assembly of the International Space Station. The Station remains a vital research platform for human endurance in space, a test bed for technologies and techniques that will enable the longer journeys to the moon, Mars and beyond.

For the latest information about the STS-114 mission on the Web, visit:
http://www.nasa.gov/returntoflight

Original Source: NASA News Release

After being grounded for more than two years, NASA’s shuttle fleet has returned to service with today’s dramatic launch of the space shuttle Discovery. It lifted off right on schedule, at 1439 UTC (10:39 am EDT), and quickly sped up through the light clouds above the Kennedy Space Center. More than 100 cameras were watching the launch from every available angle, and NASA will be examining the photographs carefully to see if any debris fell off the tank and struck the shuttle. Discovery will now link up with the International Space Station in a couple of days.

Space Shuttle Discovery. Image credit: NASA/KSC. Click to enlarge
NASA will begin the countdown for the second Return to Flight launch attempt of Space Shuttle Discovery at noon EDT, July 23, 70 hours before liftoff. On mission STS-114, Discovery’s seven-member crew will test new equipment and procedures to increase the safety of the Shuttle and deliver spare parts, water and supplies to the International Space Station.

The Kennedy Space Center launch team will conduct the countdown from Firing Room 3 of the Launch Control Center. The countdown includes nearly 28 hours of built-in hold time, leading to a preferred launch time at about 10:39 a.m. July 26 with a launch window extending about five minutes.

This historic mission is the 114th Space Shuttle flight and the 17th U.S. flight to the International Space Station. STS-114 is scheduled to last about 12 days, with a planned KSC landing at about 5:46 a.m. EDT Aug. 7.

Discovery’s first launch attempt was July 13 and was postponed at 1:30 p.m. EDT. During countdown activities, a low-level fuel cut-off sensor located inside the External Tank failed a routine prelaunch check. The sensor protects a Shuttle’s main engines by triggering their shut- down in the event that fuel runs unexpectedly low. The sensor is one of four inside the liquid hydrogen section of the External Tank.

Discovery rolled into KSC’s Orbiter Processing Facility (OPF) on Aug. 22, 2001, after returning from its last mission STS-105 in August 2001 and undergoing an Orbiter Major Modification period. The Shuttle rolled out of OPF bay 3 and into the Vehicle Assembly Building (VAB) on March 29 this year. While in VAB high bay 1, Discovery was mated to its redesigned External Tank and Solid Rocket Boosters. The entire Space Shuttle stack was transferred to Launch Pad 39B on April 7.

In order to allow for the addition of a new heater to the External Tank, Space Shuttle Discovery was rolled back to the VAB on May 26 for that modification to be performed. Discovery was removed from its External Tank and attached to a new tank originally scheduled to fly with orbiter Atlantis on mission STS-121, the second Return to Flight mission.

Discovery was rolled back out to Launch Pad 39B on June 15 in preparation for the July launch window.

On mission STS-114, the crew will perform inspections on orbit for the first time of all of the Reinforced Carbon-Carbon (RCC) panels on the leading edge of the wings and the Thermal Protection System tiles using the new Canadian-built Orbiter Boom Sensor System and the data from 176 impact and temperature sensors. Mission specialists will also practice repair techniques on RCC and tile samples during a spacewalk in the payload bay.

In the payload bay, the Multi-Purpose Logistics Module Raffaello, built by the Italian Space Agency, will carry 11 racks with supplies, hardware, equipment and the Human Research Facility-2.

During two additional spacewalks, the crew will install the External Stowage Platform-2, equipped with spare part assemblies, and a replacement Control Moment Gyroscope contained in the Lightweight Multi-Purpose Experiment Support Structure. The STS-114 crew includes Commander Eileen Collins, Pilot James Kelly, and Mission Specialists Soichi Noguchi, Stephen Robinson, Andrew Thomas, Wendy Lawrence and Charles Camarda.

For the latest information on NASA’s Return to Flight efforts, visit: http://www.nasa.gov/returntoflight

Original Source: NASA News Release

The Return to Flight mission STS-114 crew. Image credit: NASA/KSC. Click to enlarge
With some work still to go, NASA is moving toward a new launch attempt for the Space Shuttle Discovery Tuesday, July 26, at 10:39 a.m. EDT. Engineers are wrapping up a troubleshooting plan to address a fuel sensor system issue that caused Space Shuttle managers to scrub the first launch attempt for the Return to Flight mission, STS-114.

At a meeting today of the Mission Management Team, Shuttle managers decided on a plan to complete outstanding work on the External Tank’s liquid hydrogen low-level fuel sensor system circuit that runs from the External Tank into the Orbiter. The plan outlines a series of steps that could culminate in a launch next Tuesday. First, engineers will complete tests to look at electromagnetic interference as a factor in the sensor system circuit malfunction. Then, workers will swap circuits for two of the sensors to provide a means to isolate the problem to the wiring or the point sensor box, should the problem recur during the countdown. Next, engineers will shore up the electrical grounding to reduce further the chance of electromagnetic interference with the sensor system.

For a Tuesday launch, the official launch countdown for Discovery will begin Saturday. During the countdown, engineers will closely watch the behavior of the sensor system circuit as the tank is filled with super-cooled propellants.

Including the first launch attempt on Tuesday, there are at least four opportunities for Discovery to launch during the current launch window, which extends until July 31. NASA managers are also looking at the possibility of additional launch opportunities in the first week of August.

For the latest information on the Space Shuttle’s Return to Flight, visit:
http://www.nasa.gov/returntoflight

Original Source: NASA News Release

Space Shuttle is largely hidden by the Rotating Service Structure. Image credit: NASA/KSC. Click to enlarge
NASA is targeting Tuesday, July 26 as the earliest possible date to launch the Space Shuttle Discovery on the Return to Flight mission (STS-114). The determination was made during Monday’s meeting of the Mission Management Team (MMT) at Kennedy.

The MMT reviewed efforts by teams of engineers. The engineers are working through a troubleshooting plan to address an issue with a liquid hydrogen low-level fuel sensor circuit. The sensor circuit failed a routine prelaunch check during the countdown July 13, delaying Discovery’s first launch attempt.

NASA is still working to launch Discovery by the end of the July window that extends to the 31st. A dozen teams, with hundreds of engineers across the country, are expected to complete their battery of tests by Wednesday. While they have not isolated a cause of the sensor circuit failure, they have eliminated a number of possibilities. If the remaining tests are inconclusive, NASA could reload the External Tank with super-cooled propellants to see how the sensor circuit behaves. The tanking could be done as a test or as part of an actual launch countdown.

Commander Eileen Collins and her six Discovery crewmates come out of quarantine today for one day off. They resume quarantine and training later this week.

For the latest information about STS-114 on the Web, visit: http://www.nasa.gov/returntoflight

Original Source: NASA News Release

The Space Shuttle sits on the Mobile Launcher Platform. Image credit: NASA/KSC. Click to enlarge
Space Shuttle managers now say the launch of NASA’s Space Shuttle Return to Flight mission, STS-114, will take place no earlier than late next week. At 1 p.m. EDT today, managers officially stopped the current launch countdown for Space Shuttle Discovery at Kennedy Space Center, Fla. Space Shuttle managers are optimistic that Discovery can lift off by July 31, the end of this launch window.

This weekend, managers and engineers will continue troubleshooting the problem with a liquid hydrogen low-level fuel sensor inside the External Tank. The sensor failed a routine prelaunch check during the launch countdown Wednesday, causing mission managers to postpone Discovery’s first launch attempt. A dozen teams, with hundreds of engineers across the country, are working on the issue.

Once the problem is resolved and the countdown can be restarted, it will take about four days to launch. A countdown from this point will be a complete start over at T-43 (time minus 43) hours. Currently, there are no plans to roll Discovery back from the launch pad.

For now, Commander Eileen Collins and her six Discovery crew mates will stay at Kennedy Space Center while engineers work on the solution.

For the latest information about the STS-114 mission, visit:
http://www.nasa.gov/returntoflight

Original Source: NASA News Release