737 Flight Crew Operations Manual
Hydraulics -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
13.10.4 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 STANDBY HYDRAULIC LOW QUANTITY Light
Illuminated (amber) –
• indicates low quantity in standby hydraulic reservoir
• always armed.
4 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.
5 ALTERNATE FLAPS Master Switch
OFF (guarded position) – normal operating position.
ARM – closes trailing edge flap bypass valve, activates standby pump, and arms
ALTERNATE FLAPS position switch.
6 STBY RUD ON Light
Illuminated (amber) - indicates the standby hydraulic system is commanded on to
pressurize the standby rudder power control unit.
March 27, 2009
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