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For immediate release: April 16, 2004

MDA to Help Provide Wind Speed Information for Meteorological Agencies

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA) announced today that it has been selected by EADS Astrium (U.K.) Ltd. to supply systems worth $1.4 million CAD to provide data processing software for the European Space Agency's ADM-Aeolus satellite. The software will be used to produce 3D atmospheric wind speed measurements. The wind speed measurements are to be used by meteorological agencies around the world.

The European Space Agency plans to launch the ADM-Aeolus satellite in 2007 carrying a laser-based Doppler LiDAR (Light detection and ranging) instrument. MDA is responsible for software that processes the LiDAR signals into wind speed information that shows the strength of winds at different altitudes. This detailed information assists meteorological agencies around the world to increase understanding of the atmospheric processes for climate studies and to improve the accuracy of numerical weather prediction.

The ADM-Aeolus spacecraft used in this mission is pre-operational. If this initial mission meets expectations, a series of Aeolus-type spacecraft may follow for use in operational weather forecasting.

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For more information, please contact:

Wendy Keyzer
MDA External Relations
Telephone: 604-231-2743

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