(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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A
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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