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For immediate release: April 30, 2012

MDA to develop concept for communications solution for Sierra Nevada Corporation's commercial shuttle replacement

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that it has signed a contract with Sierra Nevada Corporation to provide an engineering concept for a communications solution for the ongoing phase of NASA’s Commercial Crew Development program. This program aims at developing a reusable spacecraft to transport crew and critical cargo to the International Space Station and then return to Earth.

If successful, this work could form the basis for an operational communications solution to be incorporated into the future reusable crew transportation spacecraft.

About MDA

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.

About Sierra Nevada Corporation’s Space Systems

Sierra Nevada Corporation’s Space Systems business area headquartered in Louisville, Colorado, designs and manufactures advanced spacecraft, space vehicles, and spacecraft subsystems for commercial and government customers. Space Systems (SS) has more than 20 years heritage in space, successfully delivering over 400 subsystems for 300+ satellite missions. Current key programs include NASA’s Commercial Crew Development program where we are developing our Dream Chaser® 7 passenger vehicle to take astronauts to the International Space Station; the ORBCOMM Generation 2 program that includes production of 18-48 small satellites for a commercial asset tracking company; the SpaceShip2 program where we are developing a non-toxic “green” rocket engine for Virgin Galactic’s suborbital space vehicle to carry tourists to space; and the Modular Space Vehicle program for the DoD’s Operationally Responsive Space Office. SNC media contact: media.ssg@sncorp.com or 720-407-3192

Related Websites:
www.mdacorporation.com
www.sncspace.com

Forward-Looking Statements
This release contains forward-looking statements and information, which reflect the current view of MacDonald, Dettwiler and Associates Ltd. ("MDA") with respect to future events and financial performance. The forward-looking statements in this regard include statements regarding the award of a contract. 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 contracts 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 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 comply 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 MDA's continuous disclosure materials filed from time to time with Canadian securities regulatory authorities, which are available online at www.sedar.com or on the MDA's website at www.mdacorporation.com.

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



For more information, please contact:

Wendy Keyzer
MDA External Relations
Telephone: 604-231-2743
E-mail: wendy@mdacorporation.com


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