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.
SP.16.10 D6-27370-866-EGP
ENGINE ANTI-ICE switches .............................. ON PM
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
minimum of 30% N1).
When engine anti-ice is no longer needed:
ENGINE ANTI-ICE switches .............................OFF PM
Verify that the COWL VALVE OPEN lights illuminate
bright, then extinguish.
ENGINE START switches ..................................OFF PM
Fan Ice Removal
CAUTION: Avoid prolonged operation in moderate to severe icing
conditions.
Severe icing can usually be avoided by a change in altitude and/or
airspeed. If flight in moderate to severe icing conditions cannot be
avoided, do the following on both engines, one engine at a time at
approximately 15 minute intervals:
Thrust ............................................................Increase PF
Increase thrust to a minimum of 80% N1 for
approximately 1 second to ensure the fan blades and
spinner are clear of ice.
Engine vibration can occur due to fan blade/spinner icing. If engine
vibration continues after increasing thrust, do the following on both
engines, one engine at a time:
ENGINE START switch ..............................FLT PM
Thrust .......................................................Adjust PF
Adjust thrust to 45% N1. After approximately five
seconds, increase thrust lever slowly to a minimum
of 80% N1.
September 15, 2016
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