Definition: MSA

Minimum Sector Altitude. The lowest altitude that may be used that will provide a minimum clearance of 1000 ft or 2000 ft above designated mountainous zones, above the highest obstacle located within 25nm of the designated nav aid or aerodrome designation point.

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MSA

Minimum Sector Altitude. The lowest altitude that may be used that will provide a minimum clearance of 1000 ft or 2000 ft above designated mountainous zones, above the highest obstacle located within 25nm of the designated nav aid or aerodrome designation point.

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