Minimum Sector Altitudes
MSA give 1000' obstruction clearance within 25 NM including mountains. MSA is measured from markers on ILS approaches, the NDB on NDB approaches and runway threshold on GPSs.
MINIMUM SECTOR ALTITUDE [ICAO]- The lowest altitude which may be used under emergency conditions which will provide a minimum clearance of 300 m (1,000 feet) above all obstacles located in an area contained within a sector of a circle of 46 km ...
MSA - minimum sector altitude or minimum safe altitude.
msl - mean sea level
MTBF - mean time between failures. Also MTTR, mean time to repair ...
 See also: Expect, Distress, Service, Missed approach procedure, Mayday
  
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