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Sat, Nov 03, 2007

Successful Rocket Test Bodes Well For NASA Shuttle, Constellation Programs

Two-Minute Test Accomplishes All Objectives

NASA's Space Shuttle Program successfully fired a four-segment reusable solid rocket motor Thursday, November 1 at a Utah test facility. The two-minute test provided important information for continued launches of the shuttle and for development of the Ares I rocket, a key component of NASA's Constellation Program that will launch the Orion crew vehicle on missions to the moon.

The static firing of the full-scale motor was performed at 1300 MDT at ATK Launch Systems Group, a Promontory, UT-based unit of Alliant Techsystems Inc., where the shuttle's solid rocket motors are manufactured. Preliminary indications are that all test objectives for shuttle and Ares I were met.

The test evaluation motor, or TEM-13, burned for approximately 123 seconds, the same time each reusable solid rocket motor burns during a space shuttle launch. The Reusable Solid Rocket Booster Project Office at NASA's Marshall Space Flight Center in Huntsville, Ala., manages these tests to qualify any proposed changes to the rocket motor and to determine whether new materials perform as well as those now in use.

"Full-scale static testing such as this is a key element of the 'test before you fly' standard and ensures continued quality and performance,"
said Jody Singer, deputy manager of the Shuttle Propulsion Office at Marshall.

One test objective was to demonstrate the thrust vector control system operation using only one of two hydraulic power units. The vector control, part of the flight control system, directs the thrust of the two solid rocket booster nozzles to control shuttle attitude and trajectory during liftoff and ascent. During a shuttle launch, both hydraulic power units run and provide backup power to thrust vector control actuators. The test with only one hydraulic power unit will validate the system's redundancy capability and operating performance data.

Another test objective was to measure the external sound or acoustics created when the motor ignites. More than 25 microphones were located near the motor to record the data from the firing. This information will be used to predict the motor's acoustic effects and aid in the final design of the launch structure for Ares I.

After final test data are analyzed, NASA will publish results for each objective in a report available later this year.

FMI: www.nasa.gov/shuttle, www.nasa.gov/constellation

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