Inmarsat's First Fully Assembled Global Xpress Satellite Achieves Significant Testing Milestone

Inmarsat (LSE:ISAT.L), the leading provider of global mobile satellite communications services, announced that the first fully assembled Inmarsat-5 satellite has successfully completed mechanical testing at Boeing's manufacturing facility in El Segundo, CA. The satellite, one of three that will comprise Inmarsat's new Global Xpress Ka-band broadband network, will move to the next phase of testing as preparations continue for launch later this year.

The recently completed tests included a simulated launch, which was designed to expose the spacecraft to the environmental conditions it will be subjected to during the actual launch.

“This is a very important and significant milestone in the construction and test cycle of the spacecraft as we progress with the test program and move forward to launch day,” said Franco Carnevale, Inmarsat's Vice President for Satellite and Launch Vehicles. “Exposing the satellite to the realities of the launch experience allows us to know with confidence that it can withstand the real thing.”

During the testing process, a powerful shaker was deployed to simulate the vibrations induced by the rocket's engine thrust and its 'cut-off' at stage separation. Additionally, a concrete reinforced chamber blasted the spacecraft with acoustic waves, much like those which will impact the rocket and its payload during lift-off.

Following the shaking and blasting, all mechanical appendages on the satellite were deployed and tested.

The Inmarsat-5 satellite passed every one of these extremely demanding tests and simulations. It will now move to the next phase, where it will be subjected to the void of space and the large temperature variations it will experience in orbit, which are designed to ensure the satellite can operate reliably for more than 15 years.

The second and third Inmarsat-5 satellites, currently in development by Boeing Space & Intelligence Systems, will endure similar rigorous testing prior to the launch.

“With each passing test, another step in the process is completed and we move forward to launching the satellites that will power the first global Ka-band broadband network over satellite,” concluded Carnevale.

For further information

Inmarsat
Jonathan Sinnatt
T: +44 (0)20 7728 1935
jonathan.sinnatt@inmarsat.com
Bell Pottinger for Inmarsat Energy
Neville Rawlings
T: +44 (0)20 7861 2502
NRawlings@Bell-Pottinger.co.uk

About Inmarsat

Inmarsat plc is the leading provider of global mobile satellite communications services. Since 1979, Inmarsat has been providing reliable voice and high-speed data communications to governments, enterprises and other organizations, with a range of services that can be used on land, at sea or in the air. Inmarsat employs around 1,600 staff in more than 60 locations around the world, with a presence in the major ports and centres of commerce on every continent. Inmarsat is listed on the London Stock Exchange (LSE:ISAT.L). For more information, please visit www.inmarsat.com.

About Boeing Space & Intelligence Systems

Boeing Space and Intelligence Systems (S&IS), headquartered in El Segundo, Calif., is the company's center for satellites and experimental space systems. S&IS is a world leader in the design, development and manufacturing of satellites for government, civil and commercial customers.