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STS-92
Part of ISS
STS-92
STS-92
Credit: NASA
100th shuttle mission + 100th US spacewalk. ISS Logistics flight; brought the Z-1 Truss , Control Moment Gyros, and Pressurized Mating Adapter-3 to the ISS.

AKA: Discovery;ISS-3A. Launched: 2000-10-11. Returned: 2000-10-24. Number crew: 7 . Duration: 12.90 days.

ISS Logistics flight. 100th shuttle flight. Launch delayed from October 6. STS-92 brought the Z-1 Truss (mounted on a Spacelab pallet), Control Moment Gyros, Pressurized Mating Adapter-3 (PMA-3) and two DDCU (Heat pipes) to the International Space Station.

The RSRM-76 solid rocket boosters separated at 23:19 GMT and main engine cut-off (MECO) came at 23:25 GMT. External tank ET-104 separated into a 74 x 323 km x 51.6 deg orbit. At apogee at 00:01 GMT on Oct 12, Discovery's OMS engines fired to raise perigee to a 158 x 322 km x 51.6 deg orbit; ET-104 re-entered over the Pacific around 00:30 GMT. At Oct 12 on 03:01 GMT the NC1 burn raised the orbit to 180 x 349 km; NC3 on Oct 12 to 311 x 375 km; and the TI burn at 14:09 GMT on Oct 13 to 375 x 381 km x 51.6 deg. Discovery's rendezvous with the International Space Station came at 15:39 GMT on Oct 13, with docking at 17:45 GMT. The spaceship docked with PMA-2, the docking port on the +Y port of the Space Station's Unity module. Hatch was open to PMA-2 at 20:30 GMT the same day.

STS-92 Cargo Manifest

Total payload bay cargo: ca. 14,800 kg

The Z1 first segment of the space station truss was built by Boeing/Canoga Park and was 3.5 x 4.5 meters in size. It was attached to the +Z port on Unity. Z1 carried the control moment gyros, the S-band antenna, and the Ku-band antenna.

PMA-3, built by Boeing/Huntington Beach, was docked to the -Z port opposite Z1. PMA-3 was installed on a Spacelab pallet for launch.

On October 14 at 16:15 GMT the Z1 segment was unberthed from the payload bay and at around 18:20 GMT it was docked to the zenith port on the Unity module.

On October 15 at 14:20 GMT the ODS airlock was depressurized, beginning a spacewalk by Bill McArthur and Leroy Chiao. Official NASA EVA duration (battery power to repress) was 6 hours 28 minutes.

The second spacewalk was on October 16, with Jeff Wisoff and Mike Lopez-Alegria. The suits went to battery power at 14:15 GMT and Wisoff left the airlock at 14:21 GMT. Repressurization began at 21:22 GMT for a duration of 7 hours 07minutes.

Leroy Chiao and Bill McArthur began the third STS-92 EVA at 15:30 GMT on October 17, completing their work at 22:18 GMT for a total time of 6 hours 48 minutes.

After the spacewalk, Discovery completed the second of the three station reboosts scheduled for STS-92. They fired reaction control system jets in a series of pulses of 1.4 seconds each, over a 30-minute period, gently raising the station's orbit by about 3.1 km.

The last of four successful spacewalks began on 18 October at 16:00 GMT and ended at 22:56 GMT, lasting 6 hours and 56 minutes. Jeff Wisoff and Mike Lopez-Alegria each jetted slowly through space above Discovery's cargo bay.

After the space walk, Discovery completed the third and final reboost of the space station.

On 19 October the astronauts worked within the ISS. They completed connections for the newly installed Z1 external framework structure and transferred equipment and supplies for the Expedition One first resident crew of the Station. The crew also tested the four 290-kg gyroscopes in the truss, called Control Moment Gyros, which will be used to orient the ISS as it orbits the Earth. They will ultimately assume attitude control of the ISS following the arrival of the U.S. Laboratory Destiny. The tests and the transfer of supplies into the Russian Zarya Module took longer than expected. As a result, the crew's final departure from the Station's Unity module was delayed. Melroy and Wisoff took samples from surfaces in Zarya to study the module's environment. They then unclogged the solid waste disposal system in the Shuttle's toilet, which was restored to full operation after a brief interruption in service.

Discovery undocked from the ISS at 16:08 GMT on 20 October. The final separation burn was executed about 45 minutes after undocking. The crew had added 9 metric tons to the station's mass, bringing it to about 72 metric tons. The return to earth, planned for 22 October, was delayed repeatedly due to high winds at the Kennedy landing site. The landing was finally made at Edwards Air Force Base, California, on October 24, at 22:00 GMT.

NASA Official Mission Summary

STS-92
Mission: International Space Station Assembly Flight 3.3A
Space Shuttle: Discovery
Launch Pad: 39A
Launched: October 11, 2000, 7:17 p.m. EDT
Landing Site: Edwards Air Force Base, Calif.
Landing: October 24, 2000, 1:59 p.m. PDT
Runway: 22
Rollout Distance: 9,127 feet
Rollout Time: 73 seconds
Revolution: 185
Mission Duration: 11 days, 19 hours, 12 minutes and 15 seconds
Miles Traveled: 4.9 million

Crew Members: Commander Brian Duffy, Pilot Pamela A. Melroy, Mission Specialists Koichi Wakata, Leroy Chiao, Peter J. K. Wisoff, Michael Lopez-Alegria and William S. McArthur.

Mission Highlights

STS-92, during its 12-day mission to the International Space Station (ISS), completed all assigned objectives to install the Zenith Z1 Truss and the third pressurized mating adapter (PMA 3) for use as a docking port for subsequent shuttle missions.

In the afternoon of flight day two, Discovery and her crew completed a successful rendezvous and docking with the International Space Station setting the stage for six days of construction and outfitting.

On flight day three, Japanese Astronaut, Koichi Wakata, deftly maneuvered Discovery's robotic arm to lift the Zenith Z1 Truss from the shuttle's payload bay and berthed it to a port on the Unity connecting module. Inside Unity, Pilot Pam Melroy and crewmate Jeff Wisoff opened the hatch where the new truss was attached and installed grounding connections between the framework and the station.

Discovery's five mission specialists, Leroy Chiao, Bill McArthur, Jeff Wisoff, Mike Lopez-Alegria and Koichi Wakata, performed a total of four extravehicular activities (EVA) during the STS-92 mission. They included the following assignments:

1. EVA #1: 6-hours, 28-minutes -- connection of electrical umbilicals to provide power to heaters and conduits located on the Z1 Truss; relocation and deployment of two communication antenna assemblies; and installation of a toolbox for use during on-orbit construction.

2. EVA #2: 7-hours, 7-minutes -- attachment of the PMA 3 to the ISS and preparation of the Z1 Truss for future installation of the solar arrays that will be delivered aboard STS-97 in late November.

3. EVA #3: 6-hours, 48-minutes -- installation of two DC-to-DC converter units atop the Z1 Truss for conversion of electricity generated by the solar arrays to the proper voltage.

4. EVA #4: 6-hours, 56 minutes -- testing of the manual berthing mechanism; deployment of a tray that will be used to provide power to the U.S. Lab; and removal of a grapple fixture from the Z1 Truss. Two small rescue backpacks that could enable a drifting astronaut to regain the safety of the spacecraft were also tested.

On flight day nine, the crew of Discovery shifted their attention to the interior of the ISS as they completed connections for the newly installed Z1 Truss external framework and began transferring equipment and supplies for the first resident crew of the ISS who arrived in November. They also successfully completed testing of the four control moment gyroscopes that will be used to orient the ISS as it orbits Earth.

Statistics

Discovery OV-103 (28th flight) Pad 39-A (70th launch) 100th Shuttle Mission

Milestones:

OPF -- 12/27/99 VAB -- 8/21/00 -- PAD -- 9/11/00

Payload: Space Station Assembly Flight ISS-05-3A (Z-1 Truss/SLP, CMGs, Ku/S-Band, PMA-3/SLP, DDCU), IMAX

Mission Objectives:

STS-92 was a space station assembly flight to bring the Z-1 Truss (mounted on a Spacelab pallet), Control Moment Gyros, Pressurized Mating Adapter-3 (PMA-3) and two DDCU (Heat pipes) to the International Space Station.

ITS Z1 was an early exterior framework to allow first U.S. solar arrays on flight 4A to be temporarily installed on Unity for early power. The Ku-band communication system supported early science capability and U.S. television on 6A. The CMGs (Control Moment Gyros) weighed about 600 lbs and were to provide non-propulsive (electrically powered) attitude control when activated on 5A, and PMA-3 provided a shuttle docking port for solar array installation on 4A, and Lab installation on 5A.

The mission included 7 docked days to the ISS, 4 EVA's and 2 ingress opportunities.

Over the course of four scheduled spacewalks, two teams of space walkers and an experienced robot arm operator collaborated to install the Z1 (Z for zenith port) truss structure on top of the U.S. Unity connecting node and to deliver the third Pressurized Mating Adapter (PMA 3) to the ISS for the future berthing of new station components and to accommodate shuttle dockings.

The Z1 truss was the first permanent lattice-work structure for the ISS, very much like a girder, setting the stage for the future addition of the station's major trusses or backbones. The Z1 fixture would also serve as the platform on which the huge U.S. solar arrays were to be mounted on the next shuttle assembly flight, STS-97.

The Z1 contains four large gyroscopic devices, called Control Moment Gyros (CMGs), which will be used to maneuver the ISS into the proper orientation on orbit once they are activated following the installation of the U.S. laboratory.


More at: STS-92.

Family: Manned spaceflight. People: Chiao, Duffy, Lopez-Alegria, McArthur, Melroy, Wakata, Wisoff. Country: USA. Spacecraft: Discovery. Launch Sites: Cape Canaveral. Agency: NASA, NASA Houston.

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