737 Flight Crew Operations Manual
Supplementary Procedures -
Adverse Weather
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP SP.16.15
WARNING: Do not rely on airframe visual icing cues before
activating engine anti-ice. Use the temperature
and visible moisture criteria because late
activation of engine anti-ice may allow excessive
ingestion of ice and result in engine damage or
failure.
CAUTION: Do not use engine anti-ice when OAT is above
10°C.
When engine anti-ice is needed:
ENGINE START switches .............................. CONT F/O
ENGINE ANTI-ICE switches .............................. ON F/O
Verify that the COWL VALVE OPEN lights illuminate
bright, then dim.
Verify that the COWL ANTI-ICE lights are extinguished.
Note: If the COWL VALVE OPEN lights remain illuminated
bright with engines at IDLE, increase thrust slightly (up to a
maximum of 30% N1).
When engine anti-ice is no longer needed:
ENGINE ANTI-ICE switches ............................ OFF F/O
Verify that the COWL VALVE OPEN lights illuminate
bright, then extinguish.
ENGINE START switches ................................. OFF F/O
When engine anti-ice is required and the OAT is 3°C or below,
do an engine run up, as needed, to minimize ice build-up. Use
the following procedure: C
Check that the area behind the airplane is clear.
Run-up to a minimum of 70% N1 for approximately 30 seconds duration
at intervals no greater than 30 minutes.
If airport surface conditions and the concentration of aircraft do not allow
the engine thrust level to be increased to 70% N1, then set a thrust level
as high as practical and time at that thrust level.
Note: When operating in conditions of freezing rain, freezing drizzle,
freezing fog or heavy snow, run-ups to a minimum of 70% N1
for approximately 1 second duration at intervals no greater than
10 minutes should be considered.
September 15, 2016
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