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Refer to figure.
Consider a flight operating from Zone D and expected to end in Zone A, planned for the afternoon of 26th July 2017, flying at 3 000 ft AMSL. The amount and general type of cloud that the pilot can expect halfway along the route at 3 000 ft AMSL is:
  • A
    Mainly 5 - 8 oktas CU/SC
  • B
    Isolated cumulonimbus
  • C
    3 - 7 oktas CU/SC
  • D
    5 - 8 oktas AC

Refer to figure.
Halfway along the route will be somewhere over zone B. Let’s now decode the “cloud” section for zone B at 3 000 ft:

  • ZONE B AT 3000 FT => “A broken (5-7 oktas) or overcast (8 oktas) cumulus or stratocumulus cloud layer is forecast with a base of 1 500 – 3 000ft, and tops 5 000 – 8 000ft, with moderate turbulence expected within this cloud.”

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