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DEUs. The DEUs use these discretes to determine the position
of the isolation valve.
Air Conditioning Module
The air conditioning (AC) module sends two discretes to both
DEUs. The DEUs use these discretes to determine the position
of the main engine bleed air switches on the P5 panel.
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General
The display electronic units (DEU) receive discretes from these
ice and rain protection components:
* Engine and wing antice module
* Engine cowl antice valves.
Engine and Wing Antice Module
The engine and wing antice module sends three ground
discretes to both DEUs. The discretes show the position of these
switches:
* Wing antice switch
* Engine 1 antice switch
* Engine 2 antice switch.
The DEUs send the antice switch position data out on the
general purpose buses and the EEC/APU buses. The data is
used by these airplane systems:
* Digital flight data acquisition unit
* Main engine electronic controls
* APU electronic control unit.
Engine Cowl Thermal Anti-Ice Valve.
The engine cowl thermal anti-ice valves send two ground
discretes to both DEUs. These discretes indicate the position of
the valves.
The DEUs use engine cowl antice valve position to show the TAI
message on the engine display. This message is green.
The DEUs also use engine cowl antice switch and valve position
data to determine if the valve is not in the commanded position.
If it is not, the TAI message is amber.
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Fuel Quantity Processor Unit
The fuel quantity processor unit (FQPU) sends fuel quantity data
for the left, right, and center tank systems to the display
electronic units (DEU) on ARINC 429 buses.
Center Tank Fuel Boost Pumps
The center tank left and right boost pumps send a low pressure
signal to the DEUs. The DEUs use this ground discrete to show
a fuel configuration alert.
The CONFIG message shows when these conditions are true:
* Output pressure from both center tank boost pumps is low
* 1,600 lb (725 kg) or more fuel in the center tank
* Either main engine operating.
Fuel System Module
Each DEU sends two ground discretes to the fuel system
module, one for each of the fuel filter bypass lights. The DEU is
the interface for the electronic engine controllers (EEC) to turn
on these annunciators when the EECs detect a fuel filter bypass
condition.
Generator Control Units
The DEUs send a GCU enable discrete to the generator control
units (GCUs) when the engine is at idle speed. The GCUs use
this 28v dc discrete to close the generator contactor breaker.
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EFFECTIVITY
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Electronic Engine Controllers
　
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