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MINIMUM SECTOR ALTITUDE [ICAO]

Instrument Procedures

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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 (25 NM) radius centered on a radio aid to navigation.

Source FAA Pilot/Controller Glossary · checked 2026-08-25

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