Bleed Air Isolation Valve
The bleed air isolation valve sends a ground discrete to both 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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CDS - AIR CONDITIONING AND PNEUMATIC INTERFACES
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CDS -- ICE AND RAIN PROTECTION INTERFACES General
The display electronic units (DEU) receive discretes from these ice and rain protection components:
-Engine and wing anti-ice module
-Engine cowl anti-ice valves.
Engine and Wing Antice Module
The engine and wing anti-ice module sends three ground discretes to both DEUs. The discretes show the position of these switches:
-Wing anti-ice switch
-Engine 1 anti-ice switch
-Engine 2 anti-ice switch.
The DEUs send the anti-ice 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.
737-600/700/800/900 TRAINING MANUAL
The DEUs use engine cowl anti-ice valve position to show the TAI message on the engine display. This message is green.
The DEUs also use engine cowl anti-ice 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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CDS -- FUEL AND ELECTRICAL INTERFACES 737-600/700/800/900 TRAINING MANUAL
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. The GCUs use this 28v dc discrete to close the generator contactor breaker.
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.
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CDS -- APU INTERFACES APU Electronic Control Unit
The APU electronic control unit (ECU) sends data to and receives data from the display electronic units (DEUs) on ARINC 429 data buses.
DEU 1 sends data to the APU ECU on the EEC/APU bus. The EEC/APU bus has this data:
-Flight number -Baro corrected altitude -Mach number -Total air temperature -Total pressure -Static pressure -Time/date -Target N1
- ADR discrete word
- CDS DEU discrete word 1
- CDS DEU discrete word 2
- CDS DEU discrete word 3
- BITE test word.
The ADR discrete word has this data:
-Angle of attack data
-SSEC data
-VMO/MMO data
-Overspeed warning status
-Antice system status
-ADR fail status.
The CDS DEU discrete word 1 has this data:
737-600/700/800/900 TRAINING MANUAL
-Engine running status
-Engine start valve status
-Main landing gear position status
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