[meteorite-list] NASA's Space Launch System Booster Passes Major Ground Test

[Ron Baalke]

March 11, 2015
     
NASA's Space Launch System Booster Passes Major Ground Test

The largest, most powerful rocket booster ever built successfully fired up 
Wednesday for a major-milestone ground test in preparation for future 
missions to help propel NASA's Space Launch System (SLS) rocket and Orion 
spacecraft to deep space destinations, including an asteroid and Mars.

The booster fired for two minutes, the same amount of time it will fire when 
it lifts the SLS off the launch pad, and produced about 3.6 million pounds of 
thrust. The test was conducted at the Promontory, Utah test facility of 
commercial partner Orbital ATK, and is one of two tests planned to qualify 
the booster for flight. Once qualified, the flight booster hardware will be 
ready for shipment to NASA's Kennedy Space Center in Florida for the first 
SLS flight.

"The work being done around the country today to build SLS is laying a solid 
foundation for future exploration missions, and these missions will enable us 
to pioneer far into the solar system," said William Gerstenmaier, NASA's 
associate administrator for human exploration and operations. "The teams are 
doing tremendous work to develop what will be a national asset for human 
exploration and potential science missions."

It took months to heat the 1.6 million pound booster to 90 degrees Fahrenheit 
to verify its performance at the highest end of the booster's accepted 
propellant temperature range. A cold-temperature test, at a target of 40 
degrees Fahrenheit, the low end of the propellant temperature range, is 
planned for early 2016. These two tests will provide a full range of data for 
analytical models that inform how the booster performs. During the test, 
temperatures inside the booster reached more than 5,600 degrees.

"This test is a significant milestone for SLS and follows years of 
development," said Todd May, SLS program manager. "Our partnership with 
Orbital ATK and more than 500 suppliers across the country is keeping us on 
the path to building the most powerful rocket in the world."

During the test, more than 531 instrumentation channels on the booster were 
measured to help assess some 102 design objectives. The test also 
demonstrated the booster meets applicable ballistic performance requirements, 
such as thrust and pressure. Other objectives included data gathering on 
vital motor upgrades, such as the new internal motor insulation and liner and 
an improved nozzle design.

When completed, two five-segment boosters and four RS-25 main engines will 
power the SLS on deep space missions. The 177-feet-long solid rocket boosters 
operate in parallel with the main engines for the first two minutes of 
flight. They provide more than 75 percent of the thrust needed for the rocket 
to escape the gravitational pull of the Earth.

The first flight test of SLS will be configured for a 70-metric-ton (77-ton) 
lift capacity and carry an uncrewed Orion spacecraft beyond low-Earth orbit 
to test the performance of the integrated system. The SLS will later be 
configured to provide an unprecedented lift capability of 130 metric tons 
(143 tons) to enable missions farther into our solar system.

For more information on SLS, visit:

http://www.nasa.gov/sls 

-end-

Rachel Kraft
Headquarters, Washington
202-358-1100
rachel.h.kraft at nasa.gov 


Kim Henry
Marshall Space Flight Center, Huntsville, Ala.
256-544-0034
kimberly.h.henry at nasa.gov