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PRATT & WHITNEY'S PW4084 PASSES CRITICAL TESTS

 EAST HARTFORD, Conn., Dec. 14 /PRNewswire/ -- The Pratt & Whitney PW4000 engine which will power the first Boeing 777 aircraft has successfully passed a critical safety test required for certification by the Federal Aviation Administration.
 The test showed that the PW4084 engine, the newest and largest member of the PW4000 family, can safely withstand strikes by a flock of medium-sized birds during takeoff. During the test the engine was run at 90,000 pounds of thrust, and air cannons fired the carcasses of four 2.5 pound birds into the engine at 160 mph. The air cannons propel the carcasses at critical parts of the fan and are timed so that all four strike within one second.
 Pratt & Whitney is the first engine manufacturer to pass this newly required certification test.
 After impact the engine operated for two minutes without changing the power setting. The engine was then run for approximately 20 minutes at various power settings to stimulate a return to an airport and landing. There was only minimal engine damage and computer data showed the engine operated well within safe limits throughout the test.
 "We are very pleased with the results of the test which keep us right on schedule for certification," said Jim Johnson, president of Pratt & Whitney's Large Commercial Engine business. "We will deliver an engine to Boeing and our airline customers that will more than live up to our motto, 'Dependable Engines'."
 In previous tests, the PW4084 successfully met other ingestion certification requirements, including:
 Large Bird Ingestion which demonstrates the ability of the engine to
 withstand an eight-pound bird strike.
 Water Ingestion which demonstrates safe operation in severe storm
 conditions.
 Ice Ingestion which demonstrates the ability to absorb large sheets
 of ice.
 The PW4084 will receive FAA certification in April of 1994 and begin a year-long flight test program on the new Boeing 777. It will go into service with United Airlines in June, 1995, following by All Nippon Airways and Japan Air System.
 Pratt & Whitney is a unit of United Technologies Corporation (NYSE: UTX), based in Hartford, Conn.
 -0- 12/14/93
 /CONTACT: Mark Sullivan of Pratt & Whitney, 203-565-4415/
 (UTX)


CO: Pratt & Whitney; United Technologies Corporation ST: Connecticut IN: AIR SU:

CM-DJ -- NE008 -- 3594 12/14/93 11:05 EST
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Publication:PR Newswire
Date:Dec 14, 1993
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