737 Flight Crew Operations Manual
3.4
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-4Q8-SJA
3.4
PM398 - PQ976
PT804 - PT832
Caution! Do not use engine anti-ice when TAT is
above 10°C.
1 ENGINE START switches (both) . . . . . . . . . CONT
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Ice Crystal Icing
Condition:
Engine ice crystal or TAT probe icing is
suspected. Ice crystal icing conditions exist
when in visible moisture, and one or more of
the following indications are present:
•Amber or red weather radar returns below
the airplane
•Appearance of liquid water on the
windshield at temperatures too cold for
rain (the sound is different than rain)
•The autothrottle is unable to maintain the
selected airspeed
•TAT indication stays near 0°C
(Additional items that can indicate ice crystal
icing are listed in the Additional Information
section.)
Objective:
To exit the ice crystal icing conditions and
reduce the operational effects of the icing.
Note: TAT probe icing can cause the reference N1
bugs to increase or decrease while flying at a
constant altitude and airspeed.
Note: TAT probe icing can cause the reference N1
cursors to increase or decrease while flying
at a constant altitude and airspeed.
June 15, 2018
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