AIR DATA INERTIAL REFERENCE UNIT 2 DATA LOADER CONTROL PANEL FLIGHT MANAGEMENT COMPUTER SYSTEM
ELECTRONIC ENGINE CONTROLLER 1, 2
APU ELECTRONIC CONTROL UNIT (DEU 1 ONLY)
MAIN ENGINE TEST CONNECTORS
ACARS MANAGEMENT UNIT
TCAS COMPUTER WXR CONTROL PANEL GENERATOR CONTROL UNIT FUEL SYSTEM MODULE APU ECU ENGINE START SWITCH ENGINE MODULE ENGINE ALT PWR RELAYS ENGINE RUNNING RELAYS
CDS - EXTERNAL INTERFACE INTRODUCTION
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CDS -- NAVIGATION INTERFACES - 1 Air Data Inertial Reference Unit
The air data inertial reference units (ADIRUs) send data to and receive data from the display electronic units (DEU) on ARINC 429 buses.
The ADIRUs send this air data to the DEUs:
- Uncorrected altitude
- Baro corrected altitude
- Mach number
-Computed airspeed -VMO/MMO -True airspeed -Total air temperature -Indicated angle of attack (AOA) -Total pressure -Static pressure -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:
737-600/700/800/900 TRAINING MANUAL
-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.
The DEUs send data to the ADIRUs on the CP Feedthru busses. The ADIRUs only use barometric correction from
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CDS -- NAVIGATION INTERFACES - 1
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.
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INPUTS OUTPUTS
31-62-00-106 Rev 1 06/27/2001
CDS - NAVIGATION INTERFACES - 1
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CDS -- NAVIGATION INTERFACES - 2 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.
737-600/700/800/900 TRAINING MANUAL
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.
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