When might the Minimum Descent Height (MDH) be referenced to the threshold elevation, rather than the aerodrome elevation?
Understand the Problem
The question is asking about the specific conditions under which the Minimum Descent Height (MDH) for an instrument approach procedure would be referenced to the threshold elevation of the runway instead of the overall aerodrome elevation. You need to identify the situation from the options provided where this adjustment in MDH reference would be applicable.
Answer
When the threshold elevation is more than 7 feet (2 meters) below the aerodrome elevation.
The Minimum Descent Height (MDH) is referenced to the threshold elevation when the threshold elevation is more than 7 feet (2 meters) below the aerodrome elevation.
Answer for screen readers
The Minimum Descent Height (MDH) is referenced to the threshold elevation when the threshold elevation is more than 7 feet (2 meters) below the aerodrome elevation.
More Information
The MDH is related to non-precision approaches, representing the lowest height a pilot can descend to during the final approach or circle-to-land.
Tips
A common mistake is confusing MDH with Decision Height (DH). DH is used in precision approaches, while MDH is used in non-precision approaches.
Sources
- Minimum Descent Altitude/Height (MDA/MDH) - SKYbrary - skybrary.aero
- Glossary of Terms | NFC - nfc-learning.ie
- IFR non precision approach and minima | IVAO Documentation Library - wiki.ivao.aero
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