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31-62-00-111
* Altitude alert flash
* Test display
* G/S deviation warn
* LOC deviation warn
* CMD-A
* CMD-B
* F/D A ON
* F/D B ON
* VNAV SPD
* VNAV PTH.
The DEUs use this data from the FCCs to show flight director
commands and DFCS status on the displays.
The FCCs use engine N1 from the DEU general purpose bus for
the speed trim and the flight control neutral shift functions. DEU
discrete data is also used to show the FCCs which DEU sends
data to which display unit.
Autothrottle Computer
The autothrottle computer sends the following data to the DEUs
as a discrete word on an ARINC 429 bus:
* ARM
* GA
* MCP SPD
* A/T LIMIT
* FMC SPD
* N1
* RETARD
* TEST.
The autothrottle computer sends a ground discrete to the DEUs
for the throttle hold mode.
The DEUs use this data to show the active autothrottle mode in
the flight mode annunciator on the primary flight displays. The
A/T LIMIT annunciation shows when FMCS thrust mode
annunciation data is invalid.
CDS - AUTOFLIGHT INTERFACES
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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CDS - AUTOFLIGHT INTERFACES
CDS - AUTOFLIGHT INTERFACES
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Hydraulic System Pressure
Hydraulic system A pressure transmitter sends hydraulic
pressure as an analog signal to DEU 1. Hydraulic system B
pressure transmitter sends an analog signal to DEU 2.
The DEU sends an 8v dc reference voltage to the transmitter
and the resultant current flow represents the hydraulic
pressure. The DEU then changes this current into a pressure
value for display. Nominal current is 16 mA at a hydraulic
pressure of 3000 psi.
The hydraulic system pressure data goes on the DEU cross
channel bus so that both DEUs receive hydraulic system
pressure from both system A and system B.
Hydraulic Fluid Quantity
The hydraulic fluid quantity transmitter/indicators for hydraulic
system A and B send hydraulic fluid quantity as an analog
signal to both DEUs.
The DEU sends an 8v dc reference voltage to the quantity
transmitter and the resultant output voltage from the
potentiometer in the transmitter is proportional to the
hydraulic quantity. The DEU then changes this voltage into a
hydraulic quantity value for display. Nominal voltage is 0.8147
V/Vref for a FULL reservoir indication.
Proximity Switch Electronics Unit
The proximity swich electronics unit sends four ground
discretes to each DEU. They are air ground signals from air/
ground system 1 and air/ground system 2. These discretes are
used for the display enable function in the DEUs and also flight
leg counting in BITE.
CDS - HYDRAULIC AND LANDING GEAR INTERFACES
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-62-00-112
CDS - HYDRAULIC AND LANDING GEAR INTERFACES
CDS - HYDRAULIC AND LANDING GEAR INTERFACES
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-62-00-112
General
The display electronic units (DEU) receive discretes from these
air conditioning and pneumatic systems:
* Air conditioning relays
* Pack flow control and shutoff valves
* Bleed air isolation valve
* Air conditioning module.
The DEUs send the data out on the general purpose buses and
the EEC/APU buses. This data is used by these airplane
systems:
* Digital flight data acquisition unit
* Main engine electronic controls
* APU electronic control unit.
Air Conditioning Relays
The air conditioning relays send ground discretes to both DEUs.
The DEUs use these discretes to determine the position of the
left and right pack valve normal relays.
Flow Control and Shutoff Valves
The left and right pack flow control and shutoff valves send
ground discretes to both DEUs. The DEUs use these discretes to
determine the position of the flow control and shutoff valves.
Bleed Air Isolation Valve
The bleed air isolation valve sends a ground discrete to both
　
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