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For a non-precision or circling approach, the MDH cannot be lower than…

  • A
    OCH.
  • B
    200 ft.
  • C
    350 ft.
  • D
    400 ft.

ICAO Doc 8168
Chapter 1. Definitions

Decision altitude (DA) or decision height (DH). A specified altitude or height in the precision approach or approach with vertical guidance at which a missed approach must be initiated if the required visual reference to continue the approach has not been established.

Minimum descent altitude (MDA) or minimum descent height (MDH). A specified altitude or height in a nonprecision approach or circling approach below which descent must not be made without the required visual reference.


  • Circling approach (visual): minimum descent altitude or height (MDA / MDH)
  • Non-precision approach: minimum descent altitude or height (MDA / MDH)
  • Precision approach: decision altitude or height (DA / DH)
OCH + margin = MDH
OCA + margin = MDA

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