WASHINGTON, Aug 19 (Reuters) - The U.S. Federal Aviation

Administration said on Monday it was adopting an airworthiness

directive for Boeing 787 Dreamliners following an

incident in March when a LATAM Airlines plane went into

a sudden mid-air dive that injured more than 50 passengers.

The FAA said the apparent reason for the dive was the

uncommanded movement of the captain's seat, which caused the

auto-pilot to disconnect.