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* ADR discrete word 1.
The ADR discrete word 1 has this data:
* AOA fail warning
* Overspeed warning
* Primary AOA heat
* Secondary AOA heat
* TAT heat
* Pitot static heat
* Air data system fault.
The ADIRUs send this inertial reference data to the DEUs:
* Magnetic track angle
* True track angle
* Magnetic heading
* True heading
* Present position
* Groundspeed
* Wind speed and direction
* Drift angle
* Flight path angle
* Flight path acceleration
* Pitch angle
* Roll angle
* Body pitch rate
* Body roll rate
* Body yaw rate
* Body longitudinal acceleration
* Body lateral acceleration
* Track angle rate
* Pitch attitude rate
* Roll attitude rate
* Inertial altitude
* Along track horizontal acceleration
* Cross track horizontal acceleration
* Vertical acceleration
* Inertial vertical speed
* N-S velocity
* E-W velocity.
The DEUs use this data for the CDS display function and also
send it to other user systems in the airplane.
CDS - NAVIGATION INTERFACES - 1
EFFECTIVITY
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The DEUs send data to the ADIRUs on the CP Feedthru busses.
The ADIRUs only use barometric correction from these buses.
The left ADIRU uses the barometric correction set on the
captain EFIS control panel and the right ADIRU uses the
barometric correction set on the first officer EFIS control panel.
Two CP feedthru buses are used to isolate the barometric
correction data that goes to the ADIRUs.
Instrument Switching Module
The instrument switching module has a three-position switch for
the IRS source select function. The switch positions are:
* BOTH ON L
* NORMAL
* BOTH ON R.
The instrument switching module sends ground discretes to the
DEUs to show data selection for the captain and F/O displays.
In the NORMAL position, the captain displays show inertial
reference (IR) data from the L ADIRU and the F/O displays show
IR data from the R ADIRU.
When BOTH ON L or BOTH ON R is selected, the captain and
the F/O displays show IR data from the same source.
CDS - NAVIGATION INTERFACES - 1
EFFECTIVITY
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CDS - NAVIGATION INTERFACES - 1
CDS - NAVIGATION INTERFACES - 1
EFFECTIVITY
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CDS - NAVIGATION INTERFACES - 1
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Weather Radar Transceiver
The DEUs send range data to the weather radar transceiver on
the ARINC 429 CP feedthru buses.
The weather radar transceiver sends this data to the DEUs
through the terrain/weather relays on two ARINC 453 buses:
* Reflectivity data
* Scan angle
* Range data
* Gain status
* Antenna tilt
* Operating mode
* Transceiver fault
* Control panel fault
* Attitude input fault
* Gain calibration fault
* Display fault
* Cooling fault
* Antenna stabilization limits
* Alert data.
The weather radar transceiver also sends three analog
discretes to the DEUs. These ground discretes show these
warnings on the DUs:
* PWS caution
* PWS warning
* PWS fail.
Weather Radar Control Panel
When the weather radar is selected on the EFIS control panel
and a correct display mode is selected, the DEUs send an
analog discrete to the weather radar control panel. The weather
radar control panel then sends the discrete to the weather radar
transceiver. This ground discrete turns the weather radar
transceiver on.
Ground Proximity Warning Computer
The DEUs send data to the GPWC on ARINC 429 CP feedthru
buses.
The GPWC uses this data from the CP feedthru bus:
* Range data
* CDS EFIS CP modes 1 discrete word
* CDS EFIS CP modes 2 discrete word
* Selected baro minimums data
* Selected radio minimums data.
The CDS EFIS CP modes 1 discrete word has this data:
　
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