April 28, 2009

MDA to provide advanced technology solution to EADS Astrium

Montreal, QC. - MacDonald, Dettwiler and Associates Ltd. (TSX:MDA), a provider of essential information solutions, announced today that it's Montreal facility has won a $4 million (CAD) contract to provide a Ku-band top floor antenna to European company EADS Astrium.

The technology will be integrated into the Astra 1N, a communications satellite which will mainly serve the German, French and Spanish markets, once it is launched in 2011. Its expected lifetime is 15 years.

The antenna is steerable, allowing the beam to move to different areas of Earth while the satellite remains stable. MDA's contract marks its tenth steerable solution provided since developing this specialized capability.

MDA provides advanced information solutions that capture and process vast amounts of data, produce essential information, and improve the decision making and operational performance of business and government organizations worldwide.

Focused on markets and customers with strong repeat business potential, MDA delivers a broad spectrum of information solutions, ranging from complex operational systems, to tailored information services, to electronic information products.

MDA employs more than 3,300 people in locations across the United States, the United Kingdom, and Canada. The Company's common shares trade on the Toronto Stock Exchange under the symbol. TSX:MDA.

Related Websites:
www.mdacorporation.com

For more information, please contact:

Nathalie Patenaude
Manager, Public Affairs
Telephone: (514) 425-3066
E-mail: Nathalie.patenaude@mdacorporation.com

Forward-Looking Statements
This release contains forward-looking statements and information, which reflect the current view of MacDonald, Dettwiler and Associates Ltd. with respect to future events and financial performance. Any such forward-looking statements are subject to risks and uncertainties and MDA's actual results of operations could differ materially from historical results or current expectations. Additional information on these and other potential factors that could affect MDA's financial results are detailed in documents filed from time to time with the applicable Canadian securities regulatory authorities.

The Toronto Stock Exchange has neither approved nor disapproved the form or content of this release.