the ground (weight-on-wheels) and interrupts power to the DU in
order to perform maintenance or removal of the DU.
NOTE:
A planned
modification
to
the
DISPLAY
UNIT
CONTROL switches will enable switching a DU to the
adjacent AGM in the event of a failure of the normally
associated AGM.
This
feature
would
allow
for
instance, the AGM of DU#2 to provide graphic displays
to both DU#2 and DU#1 should the AGM of DU #1 fail.
This feature is not currently available and the switch
position dedicated to this function is presently labelled
INOP.
3. Controls and Indications:
A. Circuit Breakers (CBs):
The electronic display system is protected by the following CBs:
Circuit Breaker Name:
CB Panel:
Location:
Power Source:
DISPLAY UNIT #1
POP
B-5
L ESS DC Bus
DISPLAY UNIT #2 PRI
POP
B-6
L MAIN DC Bus
DISPLAY UNIT #2 SEC
POP
B-7
L ESS DC Bus
DISPLAY UNIT #3 PRI
CPOP
B-6
R MAIN DC Bus
DISPLAY UNIT #3 SEC
CPOP
B-7
R ESS DC Bus
DISPLAY UNIT #4
CPOP
B-5
R ESS DC Bus
L CCD
POP
B-10
L ESS DC Bus
R CCD
CPOP
B-10
R ESS DC Bus
DISPLAY CONT #1
LEER
G-9
L ESS DC Bus
DISPLAY CONT #2
REER
C-2
R ESS DC Bus
DU REV
POP
E-10
L ESS DC Bus
B. Crew Alerting Systems (CAS) Messages:
CAS messages associated with the electronic display system are:
Area Monitored:
CAS Message:
Message Color:
ASCB-D
Check PFD 1-2
Red
AGMs
AGM 1-2-3-4 Fail
Amber
ASCB-D
Check PFD 1-2
Amber
ASCB-D
Check Vspeeds
Amber
DUs
DU 1-2-3-4 Overheat
Amber
AGMs
AGM 1-2-3-4 Fail
Blue
CCDs
CCD 1-2 Fail
Blue
DCs
Display Controller 1-2 Fail
Blue
NOTE
Numerous CAS messages are associated with the currency and accuracy of the
AGM databases that supply graphic information regarding navigation data shown on
the MAP display. The messages are self-explanatory and are not listed due to
space requirements.
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS
2A-31-00
Page 41
July 15/04
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