The CDS EFIS CP modes 1 discrete word has this data:
-TFC selected -Center display format -Baro minimums aural enable -VOR left selected -VOR right selected -ADF left selected -ADF right selected -Heading up map format -Airports selected
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CDS -- NAVIGATION INTERFACES - 2
-Route data selected
-Waypoints selected
-Navaid data selected
-Position data selected
-PFD/ND display format
-Plan mode selected
-Approach mode selected
-VOR mode selected
-Map mode selected.
The CDS EFIS CP modes 2 discrete word has this data:
- Baro minimums selected
- RA health
- FPV selected
- Meters selected
- STD selected
- HPA selected
- HG selected
- Terrain selected
- WXR selected.
The GPWC sends system status, caution and warning data on an ARINC 429 GPWC data bus to the DEUs. The DEUs show the system status, caution or warnings on the DUs.
The GPWC bus has this data:
-Ground proximity discrete word 2
-Fault summary word 2
-Input discrete word 2.
The ground proximity discrete word 2 has this data:
737-600/700/800/900 TRAINING MANUAL
-Terrain unavailable (position)
-Terrain status fail
-Terrain caution
-Terrain warning
-Windshear caution
-Windshear warning
-Ground proximity warning.
The fault summary word 2 has this data:
-Terrain relay 1 fail
-Terrain relay 2 fail.
The input discrete word 2 has terrain override data.
The GPWC also sends terrain display data on ARINC 453 data buses to the DEUs through the terrain/weather relays. These relays are controlled by the TERR select switches on the EFIS control panels or the pop up function within the GPWC.
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737-600/700/800/900 TRAINING MANUAL
31-62-00-107 Rev 1 06/27/2001
CP FEEDTHRU BUS 1
PWS CAUTION
PWS WARNING
PWS FAIL
WXR ON/OFF DEU 1 PWS CAUTION
PWS WARNING
PWS FAIL
WXR ON/OFF
CP FEEDTHRU BUS 1
DEU 2
CDS - NAVIGATION INTERFACES - 2
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CDS -- NAVIGATION INTERFACES - 3 Flight Management Computer System
The flight management computer system (FMCS) sends data to and receives data from the display electronic units (DEU) on ARINC 429 buses. FMC output buses 01 and 02 go through FMC transfer relay 1. FMC output buses 08 and 09 go directly to both DEUs.
The DEUs send data to the flight management computer (FMC) on the DEU-FMC bus. The DEU-FMC bus has this data:
- CDS EFIS CP modes 1 discrete word
- CDS EFIS CP modes 2 discrete word
- CP and DU maint word
-BITE response data.
The CDS EFIS CP modes 1 discrete word has this data:
-TFC selected -Center display format -Baro minimums aural enable -VOR left selected -VOR right selected -ADF left selected -ADF right selected -Heading up map format -Airports selected -Route data selected -Waypoints selected -Navaid data selected -Position data selected -PFD/ND display format
737-600/700/800/900 TRAINING MANUAL
-Plan mode selected
-Approach mode selected
-VOR mode selected
-Map mode selected.
The CDS EFIS CP modes 2 discrete word has this data:
- Baro minimums selected
- RA health
- FPV selected
- Meters selected
- STD selected
- HPA selected
- HG selected
- Terrain selected
- WXR selected.
The CP and DU maint word has this data:
-TCAS RA status
-TCAS system status.
The FMCS uses this data to format the MAP and PLAN display data that will be transmitted to the DEUs.
The BITE response data is for these other airplane systems:
-DEUs
-Main engine electronic controls (EEC)
-APU electronic control unit (ECU).
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CDS -- NAVIGATION INTERFACES - 3
The FMCS sends data to the DEUs on four ARINC 429 data buses. These buses are:
- FMC 01
- FMC 02
- FMC 08
- FMC 09.
FMC 01 and FMC 02 data goes through the FMC transfer relay 1 so that the primary FMC is supplying the data to the DEUs. These buses have this data:
-Gross weight -Greenwich mean time (GMT) -Selected temperature (takeoff derate) -Flight number -Date -Target N1 -N1 bug drive -FMC discrete word 1 -FMC discrete word 3 -BITE test word.
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