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two IOC functions. If this data is not the same, there is a failure
in one of the IOC and ARINC 429 I/Os.
CDS - DEU - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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The processor sends data to the graphics generator over the
core processor (CP) bus.
Graphic Generator
There are two identical graphic generators. The GGs receive
data from the processor over the CP bus. The GG uses the data
from the processor to make all the vector art. The GG also has
the ARINC 453 receivers to receive weather radar data and
enhanced ground proximity warning system (GPWS) data. The
WXR data shows when you push the WXR switch on the EFIS
control panel. The GPWS data shows when you push the TERR
switch on the EFIS control panel. The vector art data and the
ARINC 453 data are compressed and go out on a coax cable to
the display units.
Power Supply
The power supply supplies all the cards with power. It converts
the 28v dc to the voltages required.
Maintenance Messages
Failures in the cards cause some maintenance messages to
show on the display units. These are the maintenance
messages:
* CDS MAINT
* CDS FAULT.
The message CDS MAINT shows when one of these circuit
cards fails in either DEU:
* Graphic generator
* Discrete input/output
* Analog input/output.
The message CDS FAULT shows when there is a total DEU
failure. A total DEU failure is when any one of these circuit cards
fails:
* Input/output controller and ARINC 429 input/output
* Power supply
* Processor.
The message CDS FAULT shows if two or more of these cards
fail in a DEU or one fails in each DEU:
* Graphic generator
* Discrete input/output
* Analog input/output.
For example, if the graphics generator fails in DEU 1 and the
analog input/output fails in DEU 2, the message CDS FAULT
shows.
CDS - DEU - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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CDS - DEU - FUNCTIONAL DESCRIPTION
CDS - DEU - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
31-62-00-206
General
There are two EFIS control panels that are interchangeable.
The EFIS control panels control the information that shows on
the display units. These are the controls on the panel (not all
switches may be active and these will be marked INOP):
* Minimums controls
* Flight path vector switch
* Meters switch
* Barometric controls
* VOR/ADF switches
* Mode controls
* Range selector 3
* Traffic switch
* Weather radar switch
* Terrain switch
* Map switches.
The EFIS control panel is 4.6 inches (11.7 cm.) by 2.5 inches (6.3
cm.) and 6.5 inches (16.5 cm.) deep. The panel weighs
approximately 2.7 pounds (1.2 kg).
Minimums Controls
You use the minimums controls to select and set the radio and
barometric minimum altitude. These are the minimums
controls:
* Minimums reference selector
* Minimums selector
* Minimums reset switch.
The outer control is the minimums reference selector.
It selects either radio or barometric (baro) as the reference for
the minimum altitude.
The middle control is the minimums selector and it sets the
altitude.
The inner control is the minimums reset (RST) switch. This
switch resets the radio altitude alert when the minimums
reference selector is in the radio position. When the minimums
reference selector is in the baro position, the reset switch
resets the baro altitude alert from amber to white.
Flight Path Vector Switch
The flight path vector (FPV) switch lets you show the FPV
symbol on the attitude display.
Meters Switch
The meters switch (MTRS) is an alternate action switch. When
you select MTRS, these indications show in meters and feet:
* Altitude
* MCP select altitude.
Barometric Controls
The barometric controls select and set the barometric
reference. These are the barometric controls:
CDS - EFIS CONTROL PANEL
EFFECTIVITY
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