737 Flight Crew Operations Manual
Flight Controls -
System Description
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-866-EGP 9.20.13
During manual reversion flight (loss of hydraulic system A and B pressure), both
FLT CONTROL switches are positioned to STBY RUD. In this case, the YAW
DAMPER switch can be reset to ON and the standby hydraulic system powers the
standby yaw damper. During Standby Yaw Damper operation, movement of the
control wheel sends a signal to the standby rudder PCU to move the rudder. This
gives rudder assist to help turn the airplane when control of the ailerons is through
manual reversion.
September 23, 2010
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