(2)  
Low System Pressure Warning

 (a)  
If system pressure becomes low the low pressure switch closes to turn on the system low pressure light. A signal is also sent to the EICAS computer. This causes a low system pressure message to appear on the EICAS display.

 (b)  
If the output pressure of a pump becomes low a pressure switch closes to turn on the pump low pressure light. A signal is also sent to the EICAS computer. This causes a low pump pressure message to appear on the EICAS display.

 (c)  
If system pressure falls below 2800 psi for more than 60 seconds with both engines running, a (L, R, C) HYD SYS MAINT message will be displayed in the EICAS status and maintenance modes.

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A

757 
MAINTENANCE MANUAL 
R SYSTEM PRESSURE 
TRANSMITTER 
SEE  B  CENTER SYSTEM 
PRESSURE 
TRANSMITTER 
SEE  C 

L AND C SYSTEMS PRESSURE 
TRANSMITTERS 
SEE  A  LEFT SYSTEM 
PRESSURE 
TRANSMITTER 
SEE  C 
FWD 
LEFT WHEEL WELL INBOARD BULKHEAD 
A 

C TRANSMITTER CONNECTOR ELECTRICAL SEE TRANSMITTER PRESSURE RIGHT SYSTEM
B AFT BULKHEAD RIGHT WHEEL WELL  C TYPICAL PRESSURE TRANSMITTER LINE HYDRAULIC 
Figure 2 Pressure Transmitters 

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757
MAINTENANCE MANUAL

EICAS DISPLAY
L/R EICAS COMPUTER
PRESS XMTR
Hydraulic Quantitative Pressure Indication System Schematic
Figure 3

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757 MAINTENANCE MANUAL
FROM EDP

EDP FILTER MDL
TO HYD SYSTEM
ACMP FILTER MDL
TO BRAKES (R ONLY)
Left and Right Hydraulic System Pressure Caution Lights Schematic
Figure 4

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757 MAINTENANCE MANUAL
FROM ACMP C1

TO HYD
SYSTEM
ACMP PRESS/CASE DRAIN FLTR MODULE
RAT CHECKOUT MODULE
ENG START/RAT PRESS SW CONTROL PNL
Center Hydraulic System Pressure Caution Lights SchematicFigure 5
　
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