MDA provides operational support to Asteroid Mission

Vancouver, BC - MacDonald, Dettwiler and Associates Ltd. ("MDA" or the "Company") (TSX: MDA), a global communications and information company, today announced that it has received a contract for CA$3.7 million from the Canadian Space Agency (CSA) for NASA’s OSIRIS-REx mission. MDA will provide operations engineering support for the CSA's contribution to the mission, the OSIRIS-REx Laser Altimeter, which will provide ranging and topographic data of the asteroid Bennu. It will allow scientists to create a high resolution 3D model of its surface. Launched in September 2016, OSIRIS-REx is planned to reach Bennu in late 2018.

Marc Donato, MDA’s general manager responsible for this business said, “MDA is proud to be part of the team of scientists and engineers that will deliver the first-ever NASA-led sample return asteroid mission.”

This latest contract demonstrates MDA’s continued involvement as a leading Canadian supplier to CSA of space exploration instruments for joint US-Canada missions.

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 15 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 the award and amendment of a contract with an intergovernmental agency. 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 with any government or intergovernmental agency 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 necessarily limited to: changes in government or intergovernmental priorities, mandates, funding levels, contracts and regulations; satellite failure; failure of third parties and subcontractors; failure to anticipate changes in technology, technical standards and offerings or to 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 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.