MIA-
(See MINIMUM IFR ALTITUDES.)
MICROBURST- A small downburst with outbursts of damaging winds extending 2.5 miles or less. In spite of its small horizontal scale, an intense microburst could induce wind speeds as high as 150 knots ...
IFR charts now include OROCAs or off-route obstruction clearance altitudes which allow a pilot to figure his own MIA's by adding 1000' above an obstruction with at least 2000' lateral height of obstacle within four nautical miles. (FAR 91.
 See also: Flight, Service, ICAO, Emergency, Air traffic
  
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