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FMC discrete word 1 has this data:
-Takeoff bump -EEC on status -Isolation valve position status -Wing antice status -Engine cowl antice status -ECS pack on status -ECS pack flow status -Engine bleed status.
737-600/700/800/900 TRAINING MANUAL
FMC discrete word 3 has takeoff derate data.
The DEUs use this data to show the thrust modes on the center upper DU. Target N1 shows on the engine display and gross weight is used by DEUs to calculate the flap maneuver speeds that are shown on the PFD speed tape. GMT and date are used in BITE for fault data storage.
FMC 08 and FMC 09 data is sent directly to both DEUs. These buses have this data:
-Distance to go (waypoint)
-Estimated time of arrival (ETA)
-V speeds
-GPS latitude and longitude
-Range to altitude
-Vertical deviation
-Set landing altitude
-DME elevation
-Transition altitude
-FMC position
-Groundspeed
-Track angle (magnetic and true)
-Wind speed and direction
-Dynamic data
-Map background data
-Message text
-FMC discrete word 2.

FMC discrete word 2 has this data:
-Display IRS position difference.
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737-600/700/800/900 TRAINING MANUAL CDS -- NAVIGATION INTERFACES - 3 The DEUs use this data to make the MAP and PLAN
displays on the navigation displays (ND).
FMC Transfer Relays
The relays do not operate in this installation so that the FMC supplies the data to the DEUs.
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31-62-00-108 Rev 1 07/05/2001

DEU 2

CDS - NAVIGATION INTERFACES - 3
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737-600/700/800/900 TRAINING MANUAL CDS -- NAVIGATION INTERFACES - 4 THIS PAGE INTENTIONALLY LEFT BLANK
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CDS -- NAVIGATION INTERFACES - 4 Multi-Mode Receiver
The ILS receivers in the multi-mode receivers (MMRs) send this data to both DEUs on ARINC 429 buses:
-ILS frequency
-Station identifier
-Localizer deviation
-Glideslope deviation.

The ILS inputs go to both input output controllers (IOCs) in each DEU to meet integrity requirements. A comparison is done between these two ILS inputs in each DEU.
VHF Omnidirectional Ranging (VOR) Receiver
The VOR receivers send this data to both DEUs on ARINC 429 buses:
-VOR frequency
-Station identifier
-Bearing data
-Marker beacon discrete bits
-Fault status.

NOTE:  Marker beacon data is only sent from VOR/MB receiver 1.
Distance Measuring Equipment Interrogator
The DME interrogators send this data to both DEUs on ARINC 429 buses:
737-600/700/800/900 TRAINING MANUAL

-DME frequency
-Station identifier
-Slant range distance.
Navigation Control Panel
The navigation control panels send a ground discrete to the DEUs to show that an ILS frequency was tuned on the navigation control panel.
If a VOR frequency is tuned on the navigation control panel and the approach mode is selected on the EFIS control panel, the message, EFIS MODE/NAV FREQ DISAGREE shows on the navigation display. The same message also shows if an ILS frequency is tuned on the navigation control panel and the VOR mode is selected on the EFIS control panel.
Instrument Switching Module
The instrument switching module has a three-position switch for the VHF NAV function. The switch positions are:
-BOTH ON 1
-NORMAL
-BOTH ON 2.
The instrument switching module sends ground discretes to the DEUs to show data selection for the captain and F/O displays.
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737-600/700/800/900 TRAINING MANUAL
CDS -- NAVIGATION INTERFACES - 4
In the NORMAL position, the captain displays show data from MMR 1, VOR 1, and DME 1 systems and the F/O displays show data from MMR 2, VOR 2, and DME 2 systems.
When BOTH ON 1 or BOTH ON 2 is selected, the captain and the F/O displays show navigation data from the selected source.
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ILS TUNED-L ILS TUNED-R
NAV SOURCE SEL-L NAV SOURCE SEL-R

 

 

 

DEU 1

ILS TUNED-L ILS TUNED-R

 

NAV SOURCE SEL-L NAV SOURCE SEL-R

 

DME 2 INST SWITCHING
DEU 2
MODULE

CDS - NAVIGATION INTERFACES - 4
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CDS -- NAVIGATION INTERFACES - 5 Traffic Alert and Collision Avoidance System
The traffic alert and collision avoidance system (TCAS) computer sends data to and receives data from the display electronic units (DEUs). The TCAS computer sends this data on two ARINC 429 buses:
　
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