Intentionally
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Copyright . The Boeing Company. See title page for details.
13.TOC.0.2 September 26, 2003
Hydraulic Panel
Electric Hydraulic Pump OVERHEAT Lights
Illuminated (amber) – Hydraulic fluid used to cool and lubricate the corresponding electric motor driven pump has overheated or the pump itself has overheated.
Hydraulic Pump LOW PRESSURE Lights
Illuminated (amber) – output pressure of associated pump is low.
Note: When an engine fire warning switch is pulled, the low pressure light is deactivated.
ELECTRIC HYDRAULIC PUMPS Switches
ON – provides power to associated electric motor–driven pump.
OFF – electrical power removed from pump.
ENGINE HYDRAULIC PUMPS Switches
ON – de–energizes blocking valve in pump to allow pump pressure to enter
system.
Note: Should remain ON at shutdown to prolong solenoid life.
OFF – energizes blocking valve to block pump output.
Copyright . The Boeing Company. See title page for details.
Hydraulics -Controls and Indicators
Hydraulic Indications
MFD System (SYS) Switch
Push – SYS
.
displays hydraulic indications on lower DU; or if the lower DU is
unavailable, displays it on upper DU or inboard DU based on the position
of the display select panel selector
.
second push blanks lower DU.
HYDRAULIC System QUANTITY Indications (white)
Indicates digital percentage (0% to 106%) of hydraulic quantity. Note: Quantity also displayed at each reservoir.
HYDRAULIC System PRESSURE Indications (white)
Indicates system pressure:
.
Normal pressure – 3000 psi
.
Maximum pressure – 3500 psi.
Note: When both pumps for a system are OFF, the indication may read hydraulic system reservoir pressure, normally less than 100 psi.
Copyright . The Boeing Company. See title page for details.
13.10.2 June 1, 2003
Hydraulics -Controls and Indicators 737 Flight Crew Operations Manual
REFILL Indication (RF) (white)
Illuminated (white) – hydraulic quantity below 76%.
Note: Valid only when airplane is on ground with both engines shutdown or after landing with flaps up during taxi–in.
Flight Control Panel
YA613 - YC413
DIFF PRESS FEEL
FAIL SPEED TRIM
FAIL MACH TRIM
FAIL AUTO SLAT
Copyright . The Boeing Company. See title page for details.
June 1, 2005 13.10.3
Hydraulics -Controls and Indicators 737 Flight Crew Operations Manual
YD651 - YK104
QUANTITY LOW
PRESSURE LOW
RUD ON STBY
DIFF PRESS FEEL
FAIL SPEED TRIM
FAIL MACH TRIM
FAIL AUTO SLAT
FLIGHT CONTROL Switches
STBY RUD – activates standby pump and opens standby rudder shutoff valve to
pressurize standby rudder power control unit.
OFF – closes flight control shutoff valve isolating ailerons, elevators and rudder
from associated hydraulic system pressure.
ON (guarded position) – normal operating position.
Copyright . The Boeing Company. See title page for details.
13.10.4 March 28, 2005
Hydraulics -Controls and Indicators 737 Flight Crew Operations Manual
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.
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.
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.
STBY RUD ON Light YD651 - YK104
Illuminated (amber) - indicates the standby hydraulic system is commanded on to pressurize the standby rudder power control unit.
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