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• demand pump operates and output pressure is low
• demand pump fails to operate
5 ENGINE Hydraulic Pump Low PRESS Light
Illuminated (amber) – low engine hydraulic pump pressure.
December 01, 1999
747 Operations Manual
Hydraulics -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 13.10.3
Hydraulic System Indications
To view the status display, push the STAT display switch on the display select
panel. To view the hydraulic synoptic, push the HYD synoptic display switch on
the display select panel. Display select panel operation is described in Chapter 10,
Flight Instruments, Displays.
Status Display
1 Hydraulic Fluid Quantity (HYD QTY)
Hydraulic reservoir quantity of each system displays as a percentage of the normal
service level (1.00).
2 Hydraulic System Pressure (HYD PR)
Hydraulic pressure of each system displays in psi.
3 Hydraulic System Temperature (HYD TEMP)
Hydraulic fluid temperature of each system displays in degrees C.
4 Reservoir Refill
RF (Refill) (magenta) - displays on ground when reservoir requires refill.
5 Low Reservoir Quantity
LO (magenta) - displays when a reservoir quantity is low.
SECONDARY EICAS DISPLAY
50 50 50
2 3 4
3000 3000 950 3000
075 095
108
HYD QTY 100
HYD PR
HYD TEMP
1
RF 034LO
1
2
3
4
5
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
13.10.4 D6-30151-425
Hydraulics -
Controls and Indicators
Hydraulic Synoptic Display
The hydraulic power flow displayed is generated by the displayed valve positions,
pump status, and fluid levels. It does not display actual hydraulic power flow,
therefore the display may not represent actual system operation.
1 Engine Driven Pump
OFF - engine driven pump is not operating.
2 Demand Pump
OFF - demand pump is not operating.
SECONDARY EICAS DISPLAY
ELEV FEEL
STAB TRIM
NO POWER FLOW
HYDRAULIC POWER FLOW
10
0
0.70 RF 0.10 LO
RSVR
PRESS
QTY
TEMP
PRESS
3
50
4
1.00
2950
50
1
2950
50
2
2975
0.99
AUTOPILOT R
YAW DAMPER LWR
SPLR 2,3,10,11
AUTOPILOT L
SPLR 1,4,9,12
YAW DAMPER UPR
OFF OFF
EDP
SOV
OFF DEM
EDP
SOV
OFF DEM AUX
EDP EDP
SOV SOV
OFF
AUTO DEM OFF DEM
1
3
2
6
5
4
December 01, 1999
747 Operations Manual
Hydraulics -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 13.10.5
3 Hydraulic Reservoir
Fluid Level - displays relative fluid level in the hydraulic reservoir.
4 Auxiliary Pump
OFF - auxiliary pump is not operating.
5 Shut Off Valve
Indicates open or closed position of shut off valve.
6 Reservoir Pressure
RSVR PRESS - displays when reservoir bleed air pressure is low.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
13.10.6 D6-30151-425
Hydraulics -
Controls and Indicators
Intentionally
Blank
April 1, 2000
747 Operations Manual
Hydraulics Chapter 13
System Description Section 20
Copyright © The Boeing Company. See title page for details.
D6-30151-425 13.20.1
Introduction
The airplane has four independent hydraulic systems, numbered by the engine
which powers it. The hydraulic systems power the:
Hydraulic Systems
Each system is powered by an engine driven pump and a demand pump installed
in parallel.
Engine Driven Pumps
Each system has an engine driven pump (EDP). The EDP is pressurized when the
engine is running and the engine pump switch is ON.
Demand Pumps
The demand pumps supply normal system demands if an engine or EDP fails.
Systems 1 and 4 have air driven demand pumps. The bleed air manifold provides
pneumatic power for the air driven pumps. Systems 2 and 3 have electric motor
driven demand pumps.
Auxiliary Pump
System 4 has an electric auxiliary pump for ground handling operations.
Fluid Supply
Independent reservoirs supply fluid to each hydraulic system. The bleed air
system pressurizes the reservoirs to prevent pump cavitation and ensure positive
flow during high demand conditions. RSVR PRESS displays next to the synoptic
reservoir symbol when reservoir bleed air pressure is low.
　
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