(2)  
A reservoir pressure indication for each system is displayed in the EICAS maintenance mode. The pressure indication is LOW if the reservoir pressure is below 17 psi. The pressure indication reads NORM if the reservoir pressure is between 17 and 56 psi. The pressure indication reads HIGH if the reservoir is above 56 psi.

 (3)  
For information on the EICAS, refer to AMM 31-41-00.

 B.  Reservoir Pressure Warning Light
 (1)  A reservoir low pressure warning light for each hydraulic system is on the hydraulic control panel. This RSVR light illuminates to indicate low air pressure on the system reservoir. This light will also illuminate if hydraulic fluid quantity is low (AMM 29-33-00).
 C.  Reservoir Pressure Switch (Fig. 1 and 2)
 (1)  A reservoir pressure switch is located near the top of each reservoir. The pressure switch contains a high and a low pressure switch. These switches provide a signal to EICAS when reservoir pressure is below 17 psi or above 56 psi. This switch also activates the reservoir pressure warning light when reservoir pressure is below 17 psi.
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MAINTENANCE MANUAL

Typical Hydraulic Reservoir Pressure Switch
Figure 1

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MAINTENANCE MANUAL

Hydraulic Reservoir Pressurization Indication Schematic
Figure 2

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FAULT ISOLATION/MAINT MANUAL

HYDRAULIC RESERVOIR PRESSURE INDICATION SYSTEM
COMPONENT  FIG. 102 SHT  QTY  ACCESS/AREA  REFERENCE 
COMPUTER - (REF 31-41-00, FIG. 101) EICAS L, M10181 EICAS R, M10182 DIODE - (REF 31-01-37, FIG. 101) R10197 CENTER SYSTEM - RESERVOIR PRESSURE ISOLA-TION, R10198 LEFT SYSTEM - RESERVOIR PRESSURE ISOLATION, RIGHT SYSTEM - RESERVOIR PRESSURE ISOLA-TION, R10199 
PRESSURE INDICATOR, YQTL6 LIGHT - CENTER SYSTEM LOW QUANTITY/RESERVOIR  1  1  FLIGHT COMPARTMENT, P5 PANEL, HYDRAULIC CONTROL PANEL, M10050  * 
PRESSURE INDICATOR, YQTL2LIGHT - LEFT SYSTEM LOW QUANTITY/RESERVOIR  1  1  FLIGHT COMPARTMENT, P5 PANEL, HYDRAULIC CONTROL PANEL, M10050  * 
PRESSURE INDICATOR, YQTL4 LIGHT - RIGHT SYSTEM LOW QUANTITY/RESERVOIR 1  1  FLIGHT COMPARTMENT, P5 PANEL, HYDRAULIC CONTROL PANEL, M10050  *
 PRESSURE, S10033SWITCH - CENTER SYSTEM HYDRAULIC RESERVOIR  3  1  RESERVOIR FAIRING, CENTER SYSTEM HYDRAULIC 197KL, AFT LEFT WING-TO-BODY 29-35-01 
PRESSURE, S10032SWITCH - LEFT SYSTEM HYDRAULIC RESERVOIR  3  1  HYDRAULIC RESERVOIRLEFT WHEEL WELL, LEFT SYSTEM  29-35-01 
　
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