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National Geographic : 1977 Aug
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Letting an autopilot take the controls, pilots of a Flying Tiger Boeing 747 monitor instruments at cruise altitude (above) en route to Anchorage, Alaska. The flight engineer keeps track of fuel consumption. When a pilot approaches a weather obscured runway, he flies by instruments, then switches to outside visual references. Investigating this process, engineers at NASA's Langley Research Center in Hamp ton, Virginia, beam infrared light into the eye (left) to trace its movements among flight instruments (right). The device, an oculometer, may yield the answer to an old question: What are the minimum visual ref erences required to land an airplane? 212 National Geographic,August 1977
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