737 Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
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SP.16.30 D6-27370-866-EGP
Avoiding Ice Crystal Icing
During flight in IMC, avoid flying directly over significant amber or red
radar returns, even if there are no returns at airplane altitude.
Use the weather radar controls to assess weather radar reflectivity below
the airplane flight path. Refer to weather radar operating instructions for
additional information.
Areas with a higher risk of High Ice Water Content (HIWC) are identified
by some aviation weather vendors. In these areas, ICI should be suspected
while operating in IMC. Use of this type of HIWC information is
recommended for strategic preflight planning and in–flight adjustments in
order to avoid potential ICI conditions.
Ice Crystal Icing Suspected
Exit the ice crystal icing conditions. Request a route change to minimize
the time above red and amber radar returns.
ICE CRYSTAL ICING WEATHER
ICE CRYSTALS DO NOT CAUSE
SIGNIFICANT RADAR RETURNS
September 15, 2016
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