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ICAO Annex 2 defines "Ceiling" as the height above the ground or water of the base of the lowest layer of cloud below 20000 feet, covering..
  • A
    less than half of the sky.
  • B
    one quarter of the sky.
  • C
    more than one third of the sky.
  • D
    more than half of the sky.

ICAO Annex 2
Chapter 1. Definitions

Ceiling. The height above the ground or water of the base of the lowest layer of cloud below 6 000 metres (20 000 feet) covering more than half the sky.

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