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Isolated CBs have been forecast along the planned route. When flying in a layer of nimbostratus clouds, the pilots see a lightning flash. What actions should they take?
  • A
    Report the lightning flash at the next waypoint, which is only 15 minutes away.
  • B
    Declare a PAN PAN as the aircraft has flown into a storm.
  • C
    CBs have been forecast, no further action needed.
  • D
    Transmit a Special-Air-Report because the CB is embedded.

ICAO Doc 4444
4.12 REPORTING OF OPERATIONAL AND METEOROLOGICAL INFORMATION
4.12.3 Contents of special air-reports

4.12.3.1 Special air-reports shall be made by all aircraft whenever the following conditions are encountered or observed:

a) moderate or severe turbulence; or
b) moderate or severe icing; or
c) severe mountain wave; or
d) thunderstorms, without hail that are obscured, embedded, widespread or in squall lines; or
e) thunderstorms, with hail that are obscured, embedded, widespread or in squall lines; or
f) heavy duststorm or heavy sandstorm; or
g) volcanic ash cloud; or

h) pre-eruption volcanic activity or a volcanic eruption.

Note: Pre-eruption volcanic activity in this context means unusual and/or increasing volcanic activity which could presage a volcanic eruption.

In addition, in the case of transonic and supersonic flight:
i) moderate turbulence; or
j) hail; or
k) cumulonimbus clouds.

This question describes a situation of embedded CBs which must be reported.

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