737-300机组操作手册Flight Crew Operations Manual FCOM 3(96)

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A and B Hydraulic Systems   . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.2 A and B Hydraulic System Pumps . . . . . . . . . . . . . . . . . . . . 13.20.2 System A Hydraulic Leak . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.3 System B Hydraulic Leak . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.3 Power Transfer Unit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.4 Landing Gear Transfer Unit  . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.4
Standby Hydraulic System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.4 Automatic Operation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.20.5 Standby Hydraulic System Schematic . . . . . . . . . . . . . . . . . 13.20.6 Standby Hydraulic System Leak . . . . . . . . . . . . . . . . . . . . . . 13.20.8
Variations in Hydraulic Quantity Indications . . . . . . . . . . . . . . . 13.20.8
Hydraulics -Table of Contents 737 Operations Manual

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Copyright . The Boeing Company. See title page for details.
13.TOC.0.2  December 5, 2003

 

Hydraulic Panel

Electric Hydraulic Pump OVERHEAT Lights
Illuminated (amber) – associated electric motor–driven pump 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 associated engine-driven pump 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.

Hydraulics -Controls and Indicators

Hydraulic Indications

HYDRAULIC System PRESSURE Indications
Indicates system pressure:
.
Normal pressure (green) – 3000 psi

.
Maximum pressure (red) – 3500 psi. Note: When both pumps for a system are OFF, respective pointer reads zero.

 

HYDRAULIC System QUANTITY Indications
Non– EIS equipped airplanes:
.
System A: Full 4.7 U.S. gallons; Refill 4.2 U.S. gallons.

.
System B: Full 7.2 U.S. gallons; Refill 6.4 U.S. gallons.

Copyright . The Boeing Company. See title page for details.
13.10.2  December 1, 2000

Hydraulics -Controls and Indicators
EIS equipped airplanes:
.
Indicates digital percentage of hydraulic quantity (green).

.
Refill condition of 88% is valid only when airplane is on the ground.

Flight Control Panel (before Rudder System Enhancement Program (RSEP) modification)

FORWARD OVERHEAD PANEL

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.

Hydraulics -Controls and Indicators 737 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 FLT CONTROL switch is positioned to
STBY RUD and standby rudder shutoff valve opens

.  
the A system light indicates A system pressure is low when the rudder
pressure reducer is commanding normal system pressure.

 

Note:  The A system light will remain illuminated for approximately five seconds after A hydraulic system is activated.

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.
Copyright . The Boeing Company. See title page for details.
　
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