737 Flight Crew Operations Manual
3.7
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-4Q8-SJA
3.7
One or more of the following can indicate ice crystal
icing:
•Light to moderate turbulence
•Static discharge around the windshield (St. Elmo’s
fire)
•Smell of sulfur
•Smell of ozone
•Humidity increase
An erroneous TAT indication can occur as a result of
ice crystals blocking the sensor. The erroneous
indication can last from one minute to more than 20
minutes. TAT normally should increase
approximately 2 degrees Celsius per 1000 ft of
descent.
CAPT P/S 1 AUX STATICF/O STATIC 2 AUX P/SL ELEV PITOTL ALPHA VANETEMP PROBEF/O P/S 2 AUX STATICCAPT STATIC 1 AUX P/SR E LEV PITOTR ALPHA VANE
1 Avoid icing conditions.
■ ■ ■ ■
▼Ice Crystal Icing continued▼
Additional Information
PITOT STATIC HEAT
CAPT P/S
1 AUX STATIC
F/O STATIC
2 AUX P/S
L ELEV
PITOT
L ALPHA
VANE
TEMP
PROBE
F/O P/S
2 AUX STATIC
CAPT STATIC
1 AUX P/S
R ELEV
PITOT
R ALPHA
VANE
Condition:
One or more pitot static probe heats are
failed.
Note: Flight in icing conditions may result in
erroneous flight instrument indications.
June 17, 2016
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