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PRESS RELEASE

Pratt & Whitney's F135 Engine Exceeds 20,000 Test Hours and Completes All Initial Service Release Development Testing

EAST HARTFORD, Conn., Monday, December 20, 2010

Pratt & Whitney's F135 engine has surpassed 20,000 test hours as it completes the ground development and demonstration phase of the program. The F135 accumulated 3,600 test hours during the concept demonstration phase, 15,800 test hours during development and more than 700 hours powering the F-35 Lightning II flight test program. In addition, the F135 team has completed all rigorous STOVL testing required to successfully achieve the initial service release milestone. Pratt & Whitney is a United Technologies Corp. (NYSE:UTX) company.

"Pratt & Whitney is proud of the F135's performance in the successful ground and flight test programs," said Bennett Croswell, vice president, Pratt & Whitney F135/F119 Engine Programs. "Exceeding 20,000 test hours while simultaneously powering a successful F-35 flight test program demonstrates the maturity and reliability of the F135 engine for our customers' armed forces around the world."

The F135 is in production and is the only engine powering the F-35 Lightning II flight test program today. The F135 conventional take-off and landing (CTOL) engine and STOVL propulsion system continues to power the F-35 Lightning II flight test programs with 510 flights and more than 745 flight test hours. The F135 has powered all 12 flawless vertical landings and the F135 engine is demonstrating excellent reliability, performance and thrust response. To date, Pratt & Whitney has delivered 11 production F135 engines, including the first production STOVL propulsion systems.

Pratt & Whitney has designed, developed and tested the F135 to deliver the most advanced fifth generation fighter engine for the United States and its allies around the world. It has been further enhanced with technologies developed in several Air Force and Navy technology programs.

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 building industries.

This press release contains forward-looking statements concerning future business opportunities and operational engine performance. Actual results may differ materially from those projected as a result of certain risks and uncertainties, including but not limited to changes in funding related to the F-35 aircraft and F135 engines, changes in government procurement priorities and practices or in the number of aircraft to be built; challenges in the design, development, production and support of advanced technologies; as well as other risks and uncertainties, including but not limited to those detailed from time to time in United Technologies Corp.'s Securities and Exchange Commission filings.

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