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Ceiling is the height above the ground or water of the base of the lowest layer of cloud below 20 000 ft covering at least more than _____ the sky.
  • A
    1/2
  • B
    3/4
  • C
    1/4
  • D
    1/3

ICAO Doc 4444

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

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