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McDONNELL DOUGLAS COMPLETES TEST OF

 HUNTINGTON BEACH, Calif., June 23 /PRNewswire/ -- Passive thermal control systems that will be used in maintaining temperatures of systems and structures throughout NASA's space station were tested at McDonnell Douglas.
 The tests were conducted in the company's 39-foot diameter thermal vacuum chamber, which was outfitted to simulate the temperature extremes of an on-orbit environment.
 The passive thermal control system consists of a combination of radiators and surface coatings devised to maintain temperatures within design ranges. It is applicable to virtually every part of the space station, including primary and secondary structures, mechanical systems and fluids. These tests addressed primarily thermal control of the external avionics, using simulators of avionics equipment mounted to segments of the space station's truss and powered with electrical heaters.
 "In testing the system on the avionics, we used test articles of segments S2 and S1 of the truss, which are scheduled for launch on mission build flights two and three, respectively," said Ed Curry, McDonnell Douglas senior manager-passive thermal control systems. "The tests lasted two to three weeks, and validated our expectations regarding the behavior of the system."
 Curry noted that under most of the test conditions, the temperatures were maintained within the extremes that will be required in the station's orbit.
 The data obtained in the tests will allow engineers to predict the on-orbit behavior of the thermal control system and pave the way for the completion of the flight hardware drawings.
 -0- 6/23/93
 /CONTACT: Evelyn Smith or Sheila Carter-Hart of McDonnell Douglas Aerospace, 714-896-1700 or 714-896-1302/


CO: McDonnell Douglas Aerospace ST: California IN: ARO SU:

MF -- LA015 -- 4995 06/23/93 12:11 EDT
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Date:Jun 23, 1993
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