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Shuttle Discovery comes one step closer to Return to Flight.

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Space Shuttle Discovery has passed a major milestone in its
Return to Flight preparations.

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The shuttle orbiter's left-hand Orbital Maneuvering System,
or OMS pod, was installed April 21.

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Located on the vehicle's rear or aft end, the OMS engines are housed in two pods on opposite
sides of the Space Shuttle Main Engines.

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The Orbital Maneuvering System provides the necessary
thrust for moving the vehicle while it's in space.

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These tasks include establishing the proper orbit, changing
to a different orbit, and rendezvous and docking maneuvers.

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The OMS engines also perform the deorbit burn that begins the vehicle's descent back to Earth.

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Discovery is slated to fly a crew of seven on mission STS-114 to the International Space Station.