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ATK Nozzle for Delta IV Engine Passes Flight Certification Testing

Oct 1, 2001

ATK (Alliant Techsystems) (NYSE: ATK) said a rocket nozzle for the Boeing RS-68 engine developed by ATK Thiokol Propulsion Company, Promontory, Utah, successfully passed a series of four flight certification tests, clearing the way for production of the nozzle and its use on the maiden flight of the new Boeing Delta IV launch vehicle in early 2002.

Designed by the Rocketdyne Propulsion & Power business of Boeing, the RS-68 engine will provide first-stage propulsion for the Delta IV vehicle. With 650,000 pounds of thrust, it is the largest liquid-oxygen/liquid-hydrogen engine in the world and the first large, liquid-fueled rocket engine developed in the U.S. since the Space Shuttle main engine. ATK Thiokol Propulsion Company was awarded a contract in 1998 for engineering and manufacturing development of the engine's nozzle.

Two of the nozzle's flight certification tests simulated the most extreme mission cycles that could be experienced in flight. The other two tests replicated the first two tests at 120 percent of the mission cycle. The tests were conducted at NASA's John C. Stennis Space Center in Bay St. Louis, Miss.

Several new technologies were involved in the design of the composite nozzle, including proprietary thermal protection material to shield it from extreme gas temperatures that can exceed 6,000 degrees F.

ATK Thiokol Propulsion Company has been building nozzles for solid propulsion motors since the late 1950s. The Boeing RS-68 engine is the first production application of a nozzle of this type and the first use of the company's nozzle technology in a liquid engine application.

ATK is a $1.6 billion aerospace and defense company with leading positions in propulsion, composite structures, munitions, and precision capabilities. The company, which is headquartered in Edina, Minn., employs approximately 9,600 people and has two business segments: Aerospace and Defense. ATK news and information can be found on the Internet at http://www.atk.com/

SOURCE: Alliant Techsystems

Contact: Media, Rod Bitz, +1-952-351-3063, rod_bitz@atk.com, or
Investors, Steve Wold, +1-952-351-3056, steve_wold@atk.com, both of Alliant Techsystems