Aviation Dictionary

On this page you will find a searchable and comprehensive alphabetical list of aviation terms. You can help us make it the most comprehensive list in the world. If we have missed anything, click on the ‘send us your word’ button to send us your word, acronym or definition and we will consider adding it to our dictionary.

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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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