737 Flight Crew Operations Manual
Flight Controls -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
9.10.2 D6-27370-866-EGP
2 Flight Control LOW PRESSURE Lights
Illuminated (amber) -
• indicates low hydraulic system (A or B) pressure to ailerons, elevator
and rudder
• deactivated when associated FLIGHT CONTROL switch is positioned
to STBY RUD and standby rudder shutoff valve opens.
3 Flight SPOILER Switches
ON (guarded position) – normal operating position.
OFF – closes the respective flight spoiler shutoff valve.
Note: Used for maintenance purposes only.
4 YAW DAMPER Light
Illuminated (amber) – yaw damper is not engaged.
5 YAW DAMPER Switch
OFF – disengages yaw damper.
ON –
• engages main yaw damper to main rudder power control unit if the B
FLT CONTROL switch is in the ON position
• engages standby yaw damper to standby rudder power control unit if
both the A and B FLT CONTROL switches are in the STBY RUD
position.
6 STANDBY HYD Lights
STANDBY HYDRAULIC LOW QUANTITY Light
Illuminated (amber) -
• indicates low quantity in standby hydraulic reservoir
• always armed.
STANDBY HYDRAULIC LOW PRESSURE Light
Illuminated (amber) -
• indicates output pressure of standby pump is low
• armed only when standby pump operation has been selected or
automatic standby function is activated.
STBY RUD ON Light
• Illuminated (amber) - indicates the standby rudder system is
commanded on to pressurize the standby rudder power control unit.
September 24, 2015
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