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BOEING'S FIRST 747 TAPPED AS TESTBED FOR 777 ENGINES

 BOEING'S FIRST 747 TAPPED AS TESTBED FOR 777 ENGINES
 EVERETT, Wash., Feb. 5 /PRNewswire/ -- Boeing's (NYSE: BA) first 747 has come out of retirement to help develop the company's newest wide-bodied jetliner, the company said.
 The 23-year-old jumbo jet took flight today in the first phase of a program to test the new large engines now being built for the 777 twinjet.
 The 747 -- which was retired in March 1990 and donated to the Museum of Flight in Seattle -- flew from Everett to Seattle's Boeing Field where it will enter a modification program to strengthen its left wing so it can carry the larger 777 engines. New engine-control systems and test instruments also will be added during the modification phase.
 In August of 1993, the 747 will be equipped with a Pratt & Whitney PW4084 engine, which is being developed specifically for the 777 program. A derivative of the PW4000-series engines that power today's 747s and 767s, the PW4084 initially will be certified to produce more than 80,000 pounds of thrust through its 112-inch fan.
 During a month-long flight-test program, the airplane will operate using one PW4084 engine and three Pratt & Whitney JT9D engines, which were standard equipment on the first 747s. The JT9D engine features a 93-inch fan and was originally rated at more than 43,000 pounds of thrust.
 Following those tests, the 747 will be modified again to carry a Rolls-Royce Trent 884 engine. A derivative of the RB211 engine used on 747s and 767s, the Trent also will be certified to produce more than 80,000 pounds of thrust by using a 110-inch fan. Flight testing of the Trent engine is expected to be conducted in June 1994.
 "These engine tests represent a major program all by themselves," said Brian Neal, 777 Propulsion chief engineer. "When coupled with the most comprehensive ground and flight testing ever performed on a Boeing aircraft, these efforts will ensure that when the first 777 enters service in May 1995, it will enjoy the highest possible levels of reliability."
 In addition to Pratt & Whitney and Rolls-Royce engines, the 777 also is available with GE90 engines built by General Electric. General Electric has obtained its own 747 to conduct similar tests on its new engine, which will be certified to produce more than 80,000 pounds of thrust using a 123-inch fan.
 The initial model of the 777 will use engines rated in the 71,000- to 74,000-pound thrust class, providing range capability between 4,660 and 5,600 miles. A longer-range version of the twinjet will have engines with thrust ratings in the 82,000- to 85,000-pound category, allowing the airplane to serve routes between 7,300 and 7,600 miles.
 To support the development of its 777 program, Boeing has leased the historic 747 on behalf of Pratt & Whitney and Rolls-Royce from Seattle's non-profit Museum of Flight.
 Christened the "City of Everett," the airplane rolled out of the Boeing factory in Everett on Sept. 30, 1968, and took its maiden flight on Feb. 9, 1969. It has served as a testbed for numerous programs, and a mockup for the two 747-200s used to fly the president of the United States.
 At the conclusion of the flight test program on Pratt & Whitney and Rolls-Royce engines, the world's first 747 will be returned to the museum. The airplane eventually will be placed on public display at the museum's proposed National Flight Interpretive Center at Everett's Paine Field.
 -0- 2/5/92
 /CONTACT: Christopher Villiers of Boeing Commercial Airplane Group, 206-342-4772; or Barbara Murphy of Boeing 777 Division, 206-965-3345/
 (BA) CO: Boeing Commercial Airplane Group ST: Washington IN: AIR SU:


SC -- SE002 -- 7344 02/05/92 16:06 EST
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Publication:PR Newswire
Date:Feb 5, 1992
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