NOTE:  This comparison test is done when the SSM of the data is normal or test. The test is not done if the SSM is invalid or NCD.

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737-600/700/800/900 TRAINING MANUAL

31-62-00-104 Rev 1 06/09/2001

DEU 2

CDS - CROSS CHANNEL INTERFACES
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737-600/700/800/900 TRAINING MANUAL CDS -- EXTERNAL INTERFACE INTRODUCTION THIS PAGE INTENTIONALLY LEFT BLANK
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CDS -- EXTERNAL INTERFACE INTRODUCTION General
The display electronic units (DEU) receive ARINC 429 digital data and analog discretes from various airplane systems. The DEUs use this data to make the displays for the display units (DU).
The DEUs also send data to other airplane systems. Each DEU sends ARINC 429 data and analog discretes. These are the ARINC 429 output buses:
-CDS general purpose bus
-Control panel feedthru buses (2)
- Data loader bus 
- DEU - FMC bus 
- ACARS datalink bus 

-EEC/APU bus.
CDS General Purpose (GP) Bus
The DEUs send data on the GP bus to these airplane systems:
-Flight control computer (FCC) A and B
-Stall management yaw damper (SMYD) 1 and 2
-Flight data acquisition unit (FDAU).
The GP bus also sends data to the CDS test connector in the E4 rack in the EE compartment. This is used for functional test.
The GP bus has this general data:
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 -Captain 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 -- EXTERNAL INTERFACE INTRODUCTION
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 
- GPWC V1 callout enabled 
- FPV selected 
- Meters selected 
- STD selected 
- HPA selected 
- HG selected 
- Terrain selected 
- WXR selected. 

The displays discrete word 1 has this data:

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CDS -- EXTERNAL INTERFACE INTRODUCTION
-LOB display unit status data
-LIB display unit status data
-CU display unit status data
-CL display unit status data
-RIB display unit status data
-ROB display unit status data.
The displays discrete word 2 has this data:
-Fuel configuration alert status
-Fuel imbalance alert status
-Fuel low quantity alert status
-Mag/true status
-Autothrottle limit message status
-Engine fail message status
-Start valve open message status
-Low oil pressure message status
-Oil filter bypass message status
-Display source message status
　
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