March 17, 2010

RADARSAT Constellation Mission contract update

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd., (TSX:MDA), a provider of essential information solutions, announced today that the Canadian Space Agency has authorized the Company to start the design phase (Phase C) of the RADARSAT Constellation Mission. This authorization is limited to $11.8 million (CAD) and is expected to be completed by June 11, 2010.

The Company successfully completed work on Phase B in February 2010. This phase was originally announced in November 2008.

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.

The Company's common shares trade on the Toronto Stock Exchange under the symbol TSX:MDA.

Related Websites:
www.mdacorporation.com