MDA to provide communication subsystems for O3B Satellites

Richmond, BC - MacDonald, Dettwiler and Associates Ltd. ("MDA" or the "Company") (TSX: MDA), a global communications and information company, today announced that it has signed a contract in excess of CA$20 million with Thales Alenia Space, prime contractor for the O3b constellation, to provide 96 communication antenna subsystems. The subsystems will be used for medium Earth orbit satellites being designed and built for O3b Networks. MDA has provided previous subsystems to Thales Alenia Space, as announced in December 2011.

O3b Networks Limited is a global satellite services provider operating a next-generation satellite network for telecommunications operators, Internet Service Providers, as well as enterprise and government customers in emerging markets.

About MDA
MDA is a global communications and information company providing operational solutions to commercial and government organizations worldwide.

MDA's business is focused on markets and customers with strong repeat business potential, primarily in the Communications sector and the Surveillance and Intelligence sector. In addition, the Company conducts a significant amount of advanced technology development.

MDA's established global customer base is served by more than 4,800 employees operating from 11 locations in the United States, Canada, and internationally.

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

Related Websites
www.mdacorporation.com

Forward-Looking Statements
This release contains forward-looking statements and information, which reflect the current view of MacDonald, Dettwiler and Associates Ltd. (“MDA” or the “Company”) with respect to future events and financial performance. The forward-looking statements in this regard include statements regarding a contract award for work related to satellite subsystems. Any such forward-looking statements are based on MDA’s current expectations, estimates, projections and assumptions in light of its experience and its perception of historical trends. The factors and assumptions underlying the forward-looking statements in this release include the contract not being terminated. Any such forward-looking statements are subject to a number of risks and uncertainties that could cause actual results to differ materially from current expectations. MDA cautions readers that should certain risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary significantly from those expected. The risks that could cause actual results to differ from current expectations include, but are not limited to: risks associated with satellite manufacturing, including competition, cyclicality of MDA’s end-user markets, contractual risks, creditworthiness of customers, performance of suppliers and management of MDA’s factory and personnel; failure of third parties and subcontractors; failure of systems to meet performance requirements; and failure to anticipate changes in technology, technical standards and offerings or compliance with the requisite standards.

For additional information with respect to certain of these risks or factors, plus additional risks or factors, reference should be made to the Company's continuous disclosure materials filed from time to time with Canadian securities regulatory authorities, which are available online under the Company's profile at www.sedar.com or on the Company's website at www.mdacorporation.com.

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