NASA Space Launch System Rocket Boosters
Northrop Grumman manufactures the five-segment solid rocket boosters for the NASA Space Launch System (SLS). These are the largest solid rocket motors ever built and are rated for human flight.
Each motor consists of five rocket motor segments, thrust vector control and an aft exit cone assembly; it is 153 feet long and 12 feet in diameter. The entire booster (including nose cap, frustum, and forward and aft skirts) are approximately 177 feet long. Of the booster's total weight of 1.6 million pounds, propellant accounts for 1.5 million pounds.
Northrop Grumman conducts full-scale static tests of its motors to qualify upgrades and to ensure flawless operation. A number of quality inspections are also performed throughout the booster's manufacture, including X-ray, ensuring it will perform exactly as predicted.
The SLS provides a new capability for human exploration beyond Earth orbit. Designed to be flexible for crew or cargo missions, the SLS is safe, affordable and sustainable, to continue America's journey of discovery from the unique vantage point of space. The SLS will take astronauts farther into space than ever before, while engaging the U.S. aerospace workforce here at home.
Orion Spacecraft Attitude Control Motor
Northrop Grumman's attitude control motor (ACM) consists of a solid propellant gas generator with eight proportional valves equally spaced around the circumference of the motor. All together, the valves exert up to 7,000 lbs of steering force to the vehicle in any direction. The ACM's valve
control is fully redundant. The motor has two critical functions:
- Steer Orion's launch abort system and crew module away from the launch vehicle in the event of an emergency
- Orient the capsule for parachute deployment once cleared from hazard
Booster Separation Motors
Northrop Grumman's Booster Separation Motors (BSMs) were rigorously qualified for manned space flight, successfully used on the last 15 space shuttle missions, and are a critical part of NASA's next-generation Space Launch System (SLS). Four BSMs are installed in the forward frustum of each solid rocket booster, and four are installed in the aft skirt.
Designed to push the spent motors safely away from the core vehicle at staging, all 16 BSMs fire simultaneously at booster separation a little over two minutes into the mission, approximately 25 nautical miles above the earth's surface. Travelling 3,000 miles per hour at ignition, each BSM provides about 20,000 pounds average thrust over its one-second burn, ensuring successful launch to orbit.