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The route forecast included the chance of isolated thunderstorms. While flying in nimbostratus cloud, the pilot sees a flash of lightning. What communication, if any, should the pilot make to Air Traffic Services?
  • A
    A PAN call on the frequency in use because the pilot`s message is urgent.
  • B
    The pilot should include the information in the next position report, which is due in 15 minutes.
  • C
    A special observation report because the pilot has encountered an embedded thunderstorm.
  • D
    The observation report can be omitted because thunderstorms were forecast.

ICAO Doc 4444
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.

Note: Even though isolated thunderstorms were forecasted, the pilot came across embedded thunderstorms which must be reported.

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