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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.
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.
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.
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FMC discrete word 2 has this data:
* QFE altitude reference
* Display IRS position difference.
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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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:
* 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.
CDS - NAVIGATION INTERFACES - 4
EFFECTIVITY
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