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ATK Successfully Completes Static Tests of Nozzle for Boeing Delta IV RS-68 Engine

Engine Represents First Use of Thiokol Propulsion Corp. Nozzle in Liquid Engine Application

May 15, 2001

ATK (Alliant Techsystems) (NYSE: ATK) said a rocket nozzle for the Boeing RS-68 engine developed by Thiokol Propulsion Corp., Brigham City, Utah, has successfully completed a series of static tests conducted by Boeing at the NASA Stennis Space Center, Miss., and the Air Force Research Laboratory, Edwards Air Force Base, Calif. The tests culminated with a 303-second firing at mixed power levels and a 300-second test at full power for 20 percent longer than is required during flight.

The RS-68 is the largest liquid-oxygen and liquid-hydrogen engine in the world and the first new rocket engine designed in the U.S. since the Space Shuttle main engine. The engine was designed by Boeing Rocketdyne Propulsion and Power and will provide first-stage propulsion for the Boeing Delta IV launch vehicle, scheduled for its maiden voyage in 2002.

Thiokol has been building nozzles for solid propulsion motors since the late 1950s. The company was awarded a contract from Boeing for engineering and manufacturing development of the RS-68 nozzle in 1998. The Boeing RS-68 engine is the first use of Thiokol nozzles in a liquid engine application.

Thiokol's RS-68 nozzle is constructed of composite phenolic materials exposed to gas temperatures in excess of 6,000 degrees F. Each test evaluated the performance and overall dynamic response in this severe environment. Four nozzle test firings are planned over the next several months as part of the flight certification program.

Thiokol Propulsion Corp., one of four operating companies within ATK's Aerospace Group, was acquired by ATK from Alcoa, Inc. in April 2001. The company is a leading supplier of propulsion systems for space launch vehicles and tactical missile systems.

ATK is a $1.6 billion aerospace and defense company with leading positions in munitions, precision capabilities, propulsion and composite structures. The company, which is headquartered in Hopkins, Minn., employs approximately 10,000 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: ATK

Contact: Media, Melodie DeGuibert of Thiokol Propulsion Corp.,
435-863-3169, melodie.deguibert@thiokol.com , or Investors, Steve Wold of ATK,
952-931-6747, steve_wold@atk.com