Science: Sky View

Gunning along at 21,000 feet through the overcast skies above the Grand Can yon, a T.W.A. Constellation collided with a United Airlines DC-7 one morning last summer, sending 128 people plunging to their deaths in the worst commercialairline disaster in U.S. aviation history (TIME, July 9). To ensure greater safety in the nation's crowded skies, the Civil Aeronautics Administration this week ordered 23 long-range radars designed to give controllers a picture of aircraft from 15,000 to 70,000 feet in virtually all the U.S. air space.

Although CAA's radar network plan was announced early last...

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