The DEUs use this data to show the TCAS traffic on the navigation displays (NDs) and resolution advisories on the attitude indicators (AIs). TCAS system messages also show on the NDs.
The DEUs send resolution advisory (RA) display status to TCAS as an analog discrete. A valid shows by a ground on this discrete.
Radio Altimeter Receiver/Transmitter
The RA transceivers send radio altitude data to both DEUs on ARINC 429 buses. The DEUs use this data to show radio altitude on the flight displays.
737-600/700/800/900 TRAINING MANUAL
Automatic Direction Finder Receivers
The ADF receivers send this data to both DEUs on ARINC 429 buses:
-ADF frequency
-Station identifier
-Bearing data.
The DEUs use this data to show the ADF bearing pointers and source information on the NDs.
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737-600/700/800/900 TRAINING MANUAL
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DEU 2 ADF 2 CDS - NAVIGATION INTERFACES - 5
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737-600/700/800/900 TRAINING MANUAL CDS -- INDICATING AND RECORDING INTERFACES THIS PAGE INTENTIONALLY LEFT BLANK
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CDS -- INDICATING AND RECORDING INTERFACES
Data Loader Control Panel -
-The data loader control panel sends information to the -display electronic units (DEU) from the airborne data -loader (ADL). Software can be uploaded to the DEUs in -this manner. -
-The control panel also receives data from the DEUs on -the DFDAU bus. This function is used to download fault -history from the DEUs -
-A function discrete from the data loader is switched -through the data loader control panel to the DEUs. This -ground discrete is the load enable signal to the DEUs. -
-Flight Data Acquisition Unit -
-The flight data acquisition unit (FDAU) sends data to -and receives data from the display electronic units -(DEU) on ARINC 429 buses. The FDAU sends this surface -position data to the DEUs: -
--Stabilizer position --Control column position --Control wheel position --Rudder pedal position --Elevator position (left and right) --Aileron position (left and right) --Speedbrake handle position --Rudder position. -
-The DEUs send this data to the FDAU on the CDS general purpose bus:
- 297 -
737-600/700/800/900 TRAINING MANUAL
Stabilizer position Control column position Control wheel position Rudder pedal position Left and right elevator position Left and right aileron position Speed brake handle position Rudder position Main engine indication data Main engine internal data Main landing gear brake temperatures Main hydraulic system pressures Main hydraulic system quantities Pitch attitude Roll attitude Heading data Groundspeed Radio altitude Radio minimums data Minimum decision altitude data Localizer and glideslope deviation Main fuel tank quantities Aux. fuel quantity Main engine EEC status words DEU status words 1 and 2 CDS EFIS CP modes 1 and 2 discrete words Display discrete words 1 and 2 Captains EFIS CP discrete word 1 and 2 F/Os EFIS CP discrete word 1 and 2 CDS discrete words CDS DEU discrete word 3.
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CDS -- INDICATING AND RECORDING INTERFACES
The main engine EEC status words have this general data:
-EEC data
-Manufacturer and option data
-Thrust rating/airplane model data
-Exceedance data
-Internal protection status
-TRA data
-Thrust reverser status data
-Engine air systems status data
-ADIRU input data status.
The DEU status word 1 has this data:
-Thrust reverser position data
-Engine fault dispatch level data
-Engine starter enable data
-EEC backup power control data
-Engine running status
-Generator enable data.
The DEU status word 2 has this data:
-Main engine N1 exceedance data
-Main engine N2 exceedance data
-Main engine EGT exceedance data
-Main engine oil system caution/warning data
-Fuel filter impending bypass data.
The CDS EFIS CP modes 1 discrete word has this data:
-TFC selected
737-600/700/800/900 TRAINING MANUAL
-Center display format -Baro minimums aural enabled -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 -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
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