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Component Details (Fig. 1 and 2)
_________________
 A.  EICAS display.
 (1)  The EICAS display shows a digital readout of fluid temperature in each reservoir when the ELEC/HYD maintenance mode is selected. Messages which describe problems relating to pump overheat warning lights automatically appear on the display. The messages consist of the following:
 L ELEC HYD OVHT
 R ELEC HYD OVHT
 C HYD 1 OVHT
 C HYD 2 OVHT
 L ENG HYD OVHT
 R ENG HYD OVHT

 For information on the EICAS, refer to 31-41-00.
 B.  Overheat Lights
 (1)  An overheat warning light for each pump is on the hydraulic control panel. Each light is below the related pump select switch.
 C.  Overheat Light Temperature Switches
 (1)  The overheat temperature switch for each ACMP is inside the pump. The switch for each EDP is on the EDP pressure/case drain filter module.
 D.  Temperature Transmitters
 (1) Each reservoir temperature transmitter is installed on the system
 reservoir.
Operation

_________
 A.  Functional Description (Fig. 3 and 4)
 (1)  The fluid transmitters change resistance as fluid temperature varies. The EICAS computer converts the resistance of the temperature transmitter into a digital readout of fluid temperature on the EICAS display.
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HYDRAULIC SYSTEM

PILOT'S OVERHEAD PANEL P5 PUMP OVERHEAT LIGHT (6 PLACES)
wON 
a PRESS 

wON 
a PRESS 

wON 
a PRESS 

wON 
a PRESS 

wON 
a PRESS 

Overheat Lights
Figure 1

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MAINTENANCE MANUAL

 (2)  The overheat switches close at a preset temperature. This causes the related pump overheat light on the hydraulic control panel to turn on. When an overheat switch closes, an electrical signal is also sent to the EICAS computer. This signal causes a pump overheat message to appear on the EICAS display.

Reservoir Temperature Transmitter
Figure 2

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RSVR TEMP TRANSMITTER
Hydraulic Reservoir Temperature Indicating System
Figure 3

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