SIS update

RICHMOND, BC, June 17 /CNW/ - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that with Intelsat's concurrence it is extending by about three months the requirements definition phase of its previously announced Satellite Infrastructure Servicing (SIS) initiative.

Since the press release dated March 15, 2011, the Company has been engaged in extensive discussions with potential government and commercial customers and regulators.

Extending the requirements definition phase will give the Company the opportunity to better understand the changes necessary to address the balance between potential commercial and government customers, to evaluate whether NASA intends to fund a competing solution to our commercial initiative, and to advance the dialogue with regulators, customers and suppliers.

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.

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    Related Websites:
    www.mdacorporation.com
    www.intelsat.com
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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 extension 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 to maintain technological advances and market position; failure of systems to meet performance requirements; changes in government priorities, funding levels, contracts and regulations; satellite failure; 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 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 MDA's website at www.mdacorporation.com.

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

SOURCE MacDonald, Dettwiler and Associates Ltd.

For further information: MEDIA CONTACT: Wendy Keyzer, MDA External Relations, (604) 231-2743, wendy@mdacorporation.com


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