What does AS stand for?

Ascent Stage

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

The top part, or ascent stage, featured a small rocket ship that ferried two astronauts back to the orbiting command module where one astronaut stayed behind.

NY lunar module builders remember 1969 landing

A detachable upper ascent stage serves as a crew compartment and launches the astronauts back to lunar orbit when their mission is complete.

NASA sets its sights on Mars; Close Up

Aldrin then had to shut the hatch, shuffle over to the other side of the ascent stage and open it again before he could get out.

Corrie's fourth dimension

Nicknamed "Eagle," it was a two-piece contraption, lumpy with no need for streamlining, with a descent stage at the bottom and an ascent stage on top.

THE WORLD CHEERED FOR AMERICA