Over the years a number of visual guidance systems have been
developed to help pilots avoid obstacles on final approach.
Probably the most common design is the two-bar visual approach
slope indicator -- commonly called the VASI.
Source: James Reuther, product manager of
heat-shield testing at NASA's Ames Research Center, on designing a
new heat shield capable of protecting the Crew Exploration Vehicle
from the intense temperatures generated during reentry.
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