minimum sector altitude


Also found in: Acronyms.

minimum sector altitude

minimum sector altitude
Minimum sector altitude as shown in charts.
The lowest altitude which may be used which will provide a minimum clearance of 300 m (1000 ft) above all objects located in an area contained within a sector of 46 km (25 NM) radius centered on radio aid to navigation. (ICAO). This altitude may be used under emergency conditions. Sectors depicted on approach charts must be at least 90° in scope. These altitudes do not necessarily ensure acceptable navigational signal coverage.
References in periodicals archive ?
Then, it states that this can include "Minimum Sector Altitudes" and "Emergency Safe Altitudes" (which is for military use and has different parameters).
Minimum Sector Altitudes as defined here have the 1000-foot obstacle clearance 25 nm from a navaid.
His contention was that the crew must use the published minimum sector altitudes (MSA) published on arrival charts.

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