The CDS DEU discrete word 2 has this data:
-Engine alternate mode select status
-Engine start lever position status
-Engine ignition switch status
-Engine start switch position status.
The CDS DEU discrete word 3 has this data:
-ECS isolation valve status
-ECS pack status
-ECS pack flow status
-Antice status
-Engine bleed switch status
-Flap position data
-Air/ground system status.
The APU ECU uses this data in the APU control function.
The DEUs also send a 28v dc discrete to the APU ECU to enable BITE power up.
The APU ECU sends BITE data to both DEUs on the APU bus. The APU bus has this data:
-APU and ECU part numbers
-APU and ECU serial numbers
-APU fault data
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-315 -Config #
737-600/700/800/900 TRAINING MANUAL CDS -- APU INTERFACES -APU maintenance data -APU internal operating data.
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-316 -Config #
737-600/700/800/900 TRAINING MANUAL
31-62-00-125 Rev 1 07/05/2001
APU ELECTRONIC CONTROL UNIT
DEU 2
CDS - APU INTERFACES
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Config #
CDS -- FLIGHT CONTROL INTERFACES Stall Management Yaw Damper
The stall management yaw dampers (SMYDs) send data to and receive data from the DEUs on ARINC 429 buses. The SMYDs send this data to the DEUs:
-Maximum operating speed
-Engine out speed
-Angle of attack
-Stick shaker angle of attack
-Stick shaker speed
-Flap retraction minimum airspeed
-Minimum operating airspeed
-High speed buffet/next flap placard speed
-Pitch limit indication
-SMYD discrete.
The SMYD discrete word has this data:
-NLG air/ground discrete validity
-MLG down and locked discrete validity
-VMO/MMO warning
-Airplane model number
-SMYD position
-Autoslat command
-Autoslat valid
-Flap up signal validity.
The DEUs use this data to show placard airspeed indications and pitch limit data data on the displays.
This is the data that the SMYDs use from the DEU general purpose buses:
737-600/700/800/900 TRAINING MANUAL
-Radio altitude
-Engine anti-ice switch position
-Wing anti-ice switch position.
-Engine N1 and N2.
Radio altitude data and antice system data are used in the stall management function in the SMYDs.
The SMYDs send the N1 and N2 data to the cabin pressure controllers (CPCs).
Flap Slat Electronics Unit (FSEU)
The FSEU sends flap lever detent position data to the DEUs on an ARINC 429 bus. This is the primary source of flap position for the DEUs. If the data from the FSEU is invalid, the DEUs use flap position from the onside FCC.
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-318 -Config #
737-600/700/800/900 TRAINING MANUAL
31-62-00-124 Rev 1 07/05/2001
CDS - FLIGHT CONTROL INTERFACES
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Config #
ALTEON PROPRIETARY - Copyright (c) - See title page for details
737-600/700/800/900 TRAINING MANUAL CDS -- ENGINE INTERFACES - 1 THIS PAGE INTENTIONALLY LEFT BLANK
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CDS -- ENGINE INTERFACES - 1 Electronic Engine Controllers
The main engine electronic control units (EECs) send data to and receive data from the display electronic units (DEU) on ARINC 429 data buses.
The DEUs send data to the main engine EECs on the EEC/APU buses. The EEC/APU buses have 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
-Flaps position data.
The CDS DEU discrete word 2 has this data:
-Engine alternate mode select status
-Engine start lever position status
-Engine ignition switch status
-Engine start switch position status.
The CDS DEU discrete word 3 has this data:
-ECS isolation valve status
-ECS pack status
-ECS pack flow status
-Antice status
-Engine bleed switch status
-Flap position data
-Air/ground system status.
The EECs use this data in the engine control function.
The EECs send data to the DEUs on two seperate EEC buses. One bus has EEC channel A data and the other has EEC channel B data. The EEC buses have this data:
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