Aviation Glossary - Minimum Descent Altitude (MDA)

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Minimum Descent Altitude (MDA)

Minimum descent altitude (MDA) is the lowest altitude specified in an instrument approach procedure, expressed in feet above mean sea level, to which descent is authorized on final approach or during circle-to-land maneuvering until the pilot sees the required visual references for the heliport or runway of intended landing.

source: FAA Federal Aviation Regulations (CFR 14 Part 1)

MINIMUM DESCENT ALTITUDE (MDA):

ICAO: A specified altitude in a non-precision approach or circling approach below which descent may not be made without visual reference.
USA/FAA: The lowest altitude, expressed in feet above mean sea level, to which descent is authorized on final approach or during circle-to-land maneuvering in execution of a standard instrument approach procedure where no electronic glide slope is provided.

source: ICAO Aviation Chart Glossary

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