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For immediate release: May 25, 2004

U.S. Air Force to Deploy Flight Path Safety System Developed by MDA

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA) announced today that the United States Air Force (USAF) has made a formal decision to put into operational field service a flight path safety system designed by MDA's Information Systems group. Having successfully passed an extensive USAF-led qualification and usability testing program, the Air Force Terminal Instrument Procedures Replacement (AFTERPS-R) system will now be deployed at all USAF Major Commands and Units including a comprehensive training program for several hundred users world wide.

Terminal Instrument Procedures are published instructions to pilots specifying a series of aircraft maneuvers that must be executed for the aircraft to transition safely from an en route airway to a runway, or vice versa, when flying by instruments. The AFTERPS-R system ingests digital terrain, obstruction and aeronautical data to build and display a virtual model of the physical environment surrounding an airport that is then used to develop a safe flight path corridor. The system does this by automatically assessing the complex rules governing the design of procedures and flagging deviations from the rules that result from the physical environment. The deviations are noted by the designer, who can then quickly make modifications to the procedures.

Since first being announced in May 2001 the AFTERPS-R Program has accumulated a total contract value of $8.2 million U.S. The system has the potential to improve the safety of air transportation for other air forces and civil aviation authorities around the world.

AFTERPS-R Deployment Map (small | large)

San Francisco Airport AFTERPS-R 3-D model (small | large)

Related Websites:

For more information, please contact:

Wendy Keyzer
MDA External Relations
Telephone: 604-231-2743

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