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 B.  The pressure transmitters measure system pressure from a location that is downstream of the pressure module. Electrical power for the transmitters is supplied by the 28 volt ac power bus.
Pressure Indication (Fig. 2)
___________________
 A.  The hydraulic system pressure is shown on the primary EICAS page and the EICAS HYD synoptic page. The actual values are shown by digital displays.
 B.  Each hydraulic system has an amber SYS FAULT light that will go on if the system pressure decreases below 1,200 psi for more than two seconds. The amber master WARNING and CAUTION light on the pilots' lightshield will go on and the aural warning will be heard. The SYS FAULT condition continues until the system pressure increases above 1300 psi.
Operation
_________
 A.  Functional Description
 (1)  
The pressure transmitters send pressure signals to the hydraulic interface module (HYDIM). The HYDIM sends the signals to the EICAS interface unit (EIU), demand pumps, and the hydraulic control module. The EIU then sends the signals to the primary EICAS page, the EICAS HYD page, and the central maintenance computer system (CMCS).

 (2)  
If the hydraulic system pressure decreases below 1,200 psi, the SYS FAULT light will go on. It will also cause a caution message to come into view. HYD PRESS SYS 1,2,3, or 4 will be shown on the auxiliary EICAS display.

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A
747-400
MAINTENANCE MANUAL

HYDRAULIC TUBE
SEE B PRESSURE TRANSMITTER
HYDRAULIC TUBE
SEE A
SEE B
SYSTEM 1 AND SYSTEM 4 INSTALLATION
A

PRESSURE TRANSMITTER
HYDRAULIC TUBE
SYSTEM 2 AND SYSTEM 3 INSTALLATION B
Pressure Transmitter Location Figure 1
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MAINTENANCE MANUAL

P5 OVERHEAD PANEL
SEE A
SEE B
SYSTEM FAULT LIGHT
SYS FAULT  SYS FAULT  HYD  SYS FAULT  FAULT SYS  OFF EDP  OFF EDP  OFF EDP  OFF EDP 
PRESS  PRESS  PUMPS  PRESS  PRESS  OFF DEM  AUX  DEM  OFF DEM  DEMOFF  AUX 
OFF AUTO  ON  AUTO OFF  ON  AUTO OFF  ON  AUTO OFF  ON  SOV  SOV  SOV  SOV 

RSVR DEMAND
PRESS
AUX AUX 12 34
0.75 0.75 QTY 0.10RF 1.35
ON ON ON ON
3250 3250 PRESS 0 3250
ENGINE
50 50 TEMP 10 50 1 234
PRESS PRESS PRESS PRESS
HYDRAULIC CONTROL MODULE
EICAS HYD PAGE
A
(AUXILIARY EICAS DISPLAY) B
Hydraulic Pressure Indication Figure 2
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MAINTENANCE MANUAL

Hydraulic Pressure Indicating System Simplified Schematic
Figure 3

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747-400 MAINTENANCE MANUAL
 HYDRAULIC PRESSURE INDICATION SYSTEM - ADJUSTMENT/TEST
______________________________________________________
 1.  General_______
 A.  This procedure has two tasks. The first task is an operational test of the low pressure lights for the hydraulic demand pumps. The second task is a system test of the indicating system for the hydraulic pressure.
　
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