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PRESS RELEASE

Pratt & Whitney Rocketdyne Donates RS-68 Engine to Discovery Science Center

CANOGA PARK, Calif., Saturday, July 3, 2010

Pratt & Whitney Rocketdyne donated an RS-68 engine for display at Discovery Science Center in Santa Ana, Calif., where it will be part of an interactive exhibit that simulates a rocket lift-off with smoke, heat lamps and footage of rocket launches. As the world's largest hydrogen-fueled engine, the RS-68 to date has powered 12 Delta IV launch vehicles carrying payloads into space. Pratt & Whitney Rocketdyne is a United Technologies Corp. (NYSE:UTX) company.

"We are proud to donate an RS-68 rocket engine to a museum dedicated to educating young minds, assisting teachers and increasing public understanding of science, technology, engineering and math," said Jim Maser, president, Pratt & Whitney Rocketdyne. "We look forward to a lasting relationship aimed at sparking a child's imagination and bringing families together."

"Since the first flight of the Delta IV vehicle eight years ago, the RS-68 engine has helped boost rockets carrying satellites into orbit that have been vital to worldwide communication, navigation, research, weather prediction, as well as our own national security," said Craig Stoker, program manager, Pratt & Whitney Rocketdyne. "The Discovery Science Center is an ideal home for the engine, where it will undoubtedly inspire the next generation of rocket scientists."

The RS-68 is a liquid-hydrogen/liquid-oxygen booster engine used to power heavy-lift Delta IV rockets. It uses a simplified design with drastically fewer parts than current cryogenic engines. This design approach results in significantly lower development and production costs. Standing 25-feet tall and weighing more than 12,000 pounds, the RS-68 produces 656,000 pounds of sea-level thrust – the equivalent of 11 Hoover Dams – and consumes nearly a ton of propellant per second.

Pratt & Whitney Rocketdyne, Inc., a part of Pratt & Whitney, is a preferred provider of high-value propulsion, power, energy and innovative system solutions used in a wide variety of government and commercial applications, including the main engines for the space shuttle, Atlas and Delta launch vehicles, missile defense systems and advanced hypersonic engines. For more information about Pratt & Whitney Rocketdyne, visit www.prattwhitneyrocketdyne.com.

Pratt & Whitney is a world leader in the design, manufacture and service of aircraft engines, space propulsion systems and industrial gas turbines. United Technologies, based in Hartford, Conn., is a diversified company providing high technology products and services to the global aerospace and commercial building industries.