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BOEING-BUILT ROCKET TO SERVE KEY ROLE IN NASA SATELLITE LAUNCH AND ASTRONAUT SPACEWALK

 KENNEDY SPACE CENTER, Fla., Jan. 11 /PRNewswire/ -- Boeing said today it will open its second decade of launching the highly successful Inertial Upper Stage (IUS) booster rocket by deploying a NASA communication satellite from Space Shuttle Endeavour and providing equipment support during an astronaut spacewalk.
 Developed by Boeing Defense & Space Group in Seattle, the IUS is a two-stage, solid-fueled rocket that can launch spacecraft into a high Earth orbit from either the NASA space shuttle or the Air Force Titan rocket.
 During this first shuttle flight of 1993, the IUS will launch NASA's sixth Tracking and Data Relay Satellite (TDRS) into a 22,300-mile-high orbit around Earth, after being deployed from the shuttle cargo bay.
 TDRS satellites provide voice and data communications between the space shuttle and flight controllers, as well as provide communication with orbiting observatories such as the Hubble Space Telescope, and in the future, Space Station Freedom. The launch of TDRS-F will give NASA two fully operational satellites and a reserve satellite to meet the nation's growing demand for communication capabilities.
 Endeavour's lift-off from Cape Canaveral, Fla., is scheduled for 8:52 a.m. EST, Jan. 13. Approximately six hours after launch, the IUS mated to TDRS-F will be deployed from the shuttle cargo bay. Ignition of the IUS first stage solid rocket motor will take place one hour after deployment. The IUS second and final burn will take place five-and-a- half hours after the first burn, approximately 12-and-a-half hours into the mission. Separation of the IUS and satellite will occur at 13 hours after launch.
 Later during the mission, two of the astronauts will practice working in the open payload bay of the shuttle during a planned "extra vehicular activity" (EVA) or spacewalk. Scheduled for the fifth day of the mission, the EVA is intended to give the astronauts experience for in-space satellite repair and space station construction.
 During the EVA, astronauts will work with a device called an IUS manual actuator. The manual actuator attaches to the aft IUS Airborne Support Equipment frame, and can be used as a backup system to elevate the IUS prior to deployment from shuttle. The astronauts will practice installing and removing the manual actuator, and test different methods of moving and working with large objects in space. These skills will become important during the assembly and construction of Space Station Freedom in a few years.
 Since 1982, Boeing Defense & Space Group has built 23 IUS vehicles and has a long-lead contract to build three more for the U.S. Air Force and NASA.
 During the past 10 years, the IUS has launched four NASA communication satellites into orbit, supported six military missions, and boosted three interplanetary satellites to rendezvous with Venus, Jupiter and the sun. The 17-foot-long, 32,000-pound rocket has received international acclaim as one of the most versatile, accurate and reliable launch vehicles in America's space program.
 -0- 1/11/93
 /CONTACT: Cindy Naucler of Boeing, 206-773-2816/
 (BA)


CO: Boeing Defense & Space Group; NASA; U.S. Air Force ST: Washington, Florida IN: ARO SU:

SW -- SE004 -- 3571 01/11/93 13:16 EST
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Date:Jan 11, 1993
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