ATK Propulsion, Composite and Spacecraft Technologies Help Launch GPS IIF-3 Satellite

 ATK Propulsion, Composite and Spacecraft Technologies Help Launch GPS IIF-3
                                  Satellite

ATK Supports the Launch of United Launch Alliance's Delta IV Medium Plus

PR Newswire

ARLINGTON, Va., Oct. 4, 2012

ARLINGTON, Va., Oct. 4, 2012 /PRNewswire/ -- ATK's (NYSE: ATK) Composite and
Propulsion Technologies division supported today's successful launch of a
United Launch Alliance Delta IV rocket carrying the GPS IIF-3 satellite.

The Delta IV medium-plus rocket that was used on this flight is in the 4, 2
configuration, which features two ATK 60-inch diameter Graphite Epoxy Motors
(GEM). The 53-foot-long motors were mounted on opposing sides of the rocket,
with one vectorable motor per side, and provided additional lift capability
for the Delta IV medium plus configuration rocket. The GEM 60s burned for
approximately 90 seconds and provided 560,000 pounds of thrust to deliver the
GPS IIF-3 satellite to its predetermined orbit. The composite cases for the
GEM motors were fabricated at the ATK Clearfield, Utah facility and the motor
was built at ATK's facility in Magna, Utah.

ATK also designed and produced the nozzle for the Delta IV's RS-68 engine. The
Pratt & Whitney Rocketdyne-built RS-68 is the largest hydrogen-fueled engine
in the world. ATK also designed and produced the nozzle's thermal protection
material, which is capable of shielding the nozzle from the extreme heat of
launch when external temperatures can exceed 4,000°F. The nozzle is
manufactured at ATK's Promontory, Utah facility.

ATK supplied seven key composite structures for the Delta IV Medium plus
launch vehicle: the interstage that provides the interface between the Common
Booster Core (CBC) and the cryogenic second stage, a centerbody that
integrates the liquid oxygen (LO2) and liquid hydrogen (LH2) tanks, a thermal
shield thatprotect the RS-68 engineduring ignition and flight, and a LO2
skirt. The payload was encapsulated by a 4-m (157-in) diameter composite
payload fairing, along with a Payload Attach Fitting and Payload Attach
Fitting Diaphragm required for payload integration.

The composite structures are four to five meters in diameter and range from
one to eight meters in length. They are produced using advanced hand layup,
machining, and inspection techniques at the ATK manufacturing facility in
Iuka, Miss.

For the GPS IIF-3 satellite ATK provided a host of products including solar
arrays, antennas and titanium propellant tanks. ATK designed, manufactured
and delivered 12 satellite solar arrays (24 wings) for the Boeing-built GPS
IIF-3 satellite. Each array provides up to 3.5 kilowatts of continuous power
over the 12-year mission. The arrays were manufactured at ATK's Goleta,
Calif., facility. ATK has achieved 100-percent on-orbit success on all solar
arrays and deployable systems delivered and launched to date. The composite
solar array substrates were manufactured at ATK's San Diego, Calif. facility.
Additionally, ATK Goleta manufactured, tested and delivered 12 deployment
booms for the Burst Detector Antennae (BDA) for the GPS IIF satellites.

ATK's Rancho Bernardo, Calif. facility performed final assembly and RF (Radio
Frequency) test of the antenna suite for GPS IIF between 2003 and 2010.
Antennas tested were the TT&C (Telemetry, Tracking & Command), LBS (L-Band
System)/ITS (Integrated Transfer System) and BDA (Burst Detection
Augmentation), for which gain and antenna pattern data were verified.

The Reaction Control System (RCS) propellant tank for the Delta IV rocket was
manufactured at ATK's Commerce, Calif. facility. The GPS IIF has an ullage
tank, for which ATK Commerce has responsibility for the blankets, heaters,
thermistors and pressurant lines. This tank is a spherical vessel constructed
of titanium. The mission will deploy the third satellite in the Block IIF
series of the U.S. Air Force's next generation GPS spacecraft that will have
improved accuracy, enhanced internal atomic clocks, better anti-jam
resistance, a civil signal for commercial aviation and a longer design life.

This newest spacecraft will replace the GPS 2A-21 satellite that was launched
by a Delta 2 rocket on June 26, 1993. The IIF series incorporate various
improvements to provide greater accuracy, increased signals, and enhanced
performance for users. 

ATK is an aerospace, defense, and commercial products company with operations
in 21 states, Puerto Rico, and internationally. News and information can be
found on the Internet at www.atk.com.

Certain information discussed in this press release constitutes
forward-looking statements as defined in the Private Securities Litigation
Reform Act of 1995. Although ATK believes that the expectations reflected in
such forward-looking statements are based on reasonable assumptions, it can
give no assurance that its expectations will be achieved. Forward-looking
information is subject to certain risks, trends and uncertainties that could
cause actual results to differ materially from those projected. Among those
factors are: changes in governmental spending, budgetary policies and product
sourcing strategies; the company's competitive environment; the terms and
timing of awards and contracts; and economic conditions. ATK undertakes no
obligation to update any forward-looking statements. For further information
on factors that could impact ATK, and statements contained herein, please
refer to ATK's most recent Annual Report on Form 10-K and any subsequent
quarterly reports on Form 10-Q and current reports on Form 8-K filed with the
U.S. Securities and Exchange Commission.

Media Contact:                Investor Contact:
Trina Helquist                Steve Wold
Phone: 801-699-0943            Phone: 952-351-3056
E-mail: trina.helquist@atk.com E-mail: steve.wold@atk.com

SOURCE ATK

Website: http://www.atk.com
 
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