The Company's MD&A for the three and six months ended June 30, 2017 provides additional information regarding these financial metrics and the specified items affecting the comparability of net earnings.

Forward-Looking Statements

This earnings release and the associated conference call and webcast, which includes a business update, discussion of financial results for the second quarter of 2017, and question and answer session, may contain certain 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. Forward-looking statements generally can be identified by the use of forward-looking terminology such as "may", "will", "would", "could", "should", "expect", "intend", "estimate", "anticipate", "plan", "foresee", "believe" or "continue" or the negatives of such terms or variations of them or similar terminology. Forward-looking statements are based on the opinions and estimates of management as of the date such statements are made and represent management's best judgment based on facts and assumptions that management considers reasonable.

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 materially from current expectations include, but are not limited to: the Company's ability to generate a sustainable order rate for its satellite manufacturing operations in a market where the number of satellite construction contracts awarded varies annually; changes in government policies, priorities, regulations or government agency mandates, or funding levels through agency budget reductions, the imposition of budgetary constraints or a decline in government support or deferment of funding for programs in which the Company or its customers participate; the Company's ability to effectively execute its U.S. government access plan and realize anticipated benefits of contract awards from the U.S. government and failure by the Company to comply with U.S. regulations could result in penalties or suspension; certain U.S. subsidiaries of the Company are subject to the requirements of the National Industrial Security Program Operating Manual for their facility security clearance, which is a prerequisite for their ability to obtain and perform on classified contracts for the U.S. government; quality issues, failure of systems to meet performance requirements, potential for product liability, or the occurrence of defects in products or systems could result in lost revenue and harm to the Company's reputation; failure to anticipate changes in technology, technical standards and offerings or comply with the requisite standards, or failure to maintain technological advances and offer new products to retain customers and market position; significant competition with competitors that are larger or have greater resources, and where foreign currency fluctuations may increase competition from the Company's non-United States competitors; changes in regulations, telecommunication standards and laws in the countries in which the Company conducts business; export restrictions or the inability to obtain export approvals; failure to obtain necessary regulatory approvals and licenses, including those required by the United States government; a competitive advantage for competitors not subject to the same level of export control or economic sanctions laws and regulations faced by the Company; exposure to fines and/or legal penalties under Canadian securities regulations; exposure to fines and/or legal sanctions under anti-corruption laws; the Company's ability to attract and retain qualified personnel; reliance on information technology systems and threats of disruption from security breaches and cyber-attacks; the Company's ability to receive satellite imagery, including from third parties for resale and performance issues on the Company's on-orbit satellite; potential infringement of the intellectual property rights of others and inadequate protection of the Company's intellectual property rights; failure to identify, acquire, obtain the required regulatory approvals, or profitably manage additional businesses or successfully integrate any acquired businesses, products or technologies into the Company without substantial expenses, delays or other operational, regulatory, or financial problems; the Company's ability to obtain certain satellite construction contracts depends, in part, on its ability to provide the customer with partial financing of working capital and any financing provided by the Company may not be repaid or the Company may be called upon to make payments; uncertainty in financing arrangements and failure to obtain required financing on acceptable terms, or credit agreements may contain restrictive covenants which may be limiting; risks inherent with performance on fixed price contracts, particularly the ability to contain cost overruns and schedule delays; certain customers are highly leveraged and may not fulfil their contractual payment obligations, including vendor financing; the risk that the Company will not be able to access export credit financing to facilitate the sale of the Company's communication satellites and other products to non-Canadian and non-United States customers; exposure to foreign currency fluctuations; natural disasters or other disruptions affecting the Company's operations; and failure to comply with environmental regulations.

There may be additional risks and uncertainties applicable to the Company related to its proposed merger with DigitalGlobe, Inc. as announced on February 24, 2017, including that: there can be no assurance that the merger will be completed taking into account all approvals, including regulatory approvals required for the merger; the Company may not realize all of the expected benefits of the merger or the benefits may not occur within the time periods anticipated; the announcement and pendency of the merger could adversely affect the Company's business, results of operations and financial condition; the Company will incur substantial transaction fees and costs in connection with the merger and will incur additional fees in certain circumstances; significant demands will be placed on the managerial, operational and financial personnel and systems of the Company to support the expansion of operations as a result of the merger; the Company may not have discovered undisclosed liabilities in the course of the due diligence review of DigitalGlobe and the Company as a successor owner may be responsible for such undisclosed liabilities; while the merger agreement is in effect, the Company is subject to restrictions on its business activities; and the Company may be a target of securities class action and derivative lawsuits which could result in substantial costs and may delay or prevent the merger from being completed.

You are referred to the risk factors described in MDA's most recent annual Management's Discussion and Analysis, Annual Information Form and other documents on file with the Canadian securities regulatory authorities, available on SEDAR, www.sedar.com or www.mdacorporation.com. The forward-looking statements and information contained in this earnings release and the associated conference call and webcast represent MDA's views only as of today's date. MDA disclaims any intention or obligation to update or revise any forward-looking statements, whether because of new information, future events or otherwise, other than as required by law, rule or regulation. You should not place undue reliance on forward-looking statements.

The Toronto Stock Exchange has neither approved nor disapproved the form or content of the earnings release or the associated conference call and webcast.

CONTACT:

Marissa Poratto | MDA Investor Relations | 1-604-331-2044 | mporatto@mdalimited.ca

Wendy Keyzer | MDA Media Contact | 1-604-231-2743 | wendy@mdacorporation.com

SOURCE MacDonald, Dettwiler and Associates Ltd.