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to provide power, the other essential bus pro-
vides a redundant power source. Each power
source is protected by circuit breakers, labeled
L/R WARN PANEL, located within the IN-
STRUMENTS/INDICATIONS group on their
respective circuit breaker panels.
BULB CHANGE
In the field, maintenance is limited to replac-
ing lighting elements. The CWP is illumi-
nated with incandescent lamps for the white
EMER/BATT indicator and three LED as-
semblies, divided by light dividers for all other
red annunciations. The master WARN/CAUT
lights are illuminated with incandescent lamps.
DIMMING FUNCTION
Each master WARN/CAUT light is dimmed by
day/night dimming power supplied to it. The
CWP and engine “FIRE PUSH” lights are
dimmed when the NAV lights switch is on and
bright when the NAV lights are turned off.
CREW WARNING PANEL
(CWP)
The crew warning panel (CWP) is located in
the center of the instrument panel, just above
the radio management units (Figure 4-1). The
CWP operates in parallel with the crew alert-
ing system (CAS), and each of the red CWP
warning lights is duplicated with a red CAS
message. Illumination of a red CWP warning
light automatically triggers illumination of the
master WARN lights and the audible triple
chime. Airplane system warnings that are not
annunciated on the CWP are engine and APU
fire annunciations. They are illuminated on
their respective control panels.
Crew alerting of CWP failures are limited to
power supply failures annunciated by a white
“L or R WARN PWR FAIL” CAS message.
This indicates that one power source has mal-
functioned, but the CWP is still operational.
Should both power sources subsequently fail,
an amber “LR WARN PWR FAIL” and amber
“WARN AUDIO” CAS message will be pre-
sented, indicating that all functions of the
CWP, including master WARN/CAUT, all
aural alerts and the red FIRE PUSH and en-
gine/extinguisher ARMED light in the en-
gine/fuel control panel are inoperative.
CREW ALERTING
SYSTEM (CAS)
OPERATION
The messages in the CAS window of the
EICAS display are shown in the following
color codes:
• Red = WARNING Message
• Amber = CAUTION Message
• White = Advisory Message
The CAS serves as a backup display unit for
all red warnings, and as the primary display
unit for amber caution and white advisory
messages.
As shown in Figure 4-3, the messages are
grouped by color and all red messages are dis-
played with a higher priority than amber mes-
sages, and all amber messages are displayed
with higher priority than white messages.
Fourteen CAS messages can be displayed at
any given time. If more messages are dis-
played than the window allows, then an up-
down arrow with “MESSAGES” and the
number of messages not in view are displayed
as the last item in the CAS window. To scroll
the messages up or down within the window,
rotate the CAS rotary knob on the DU bezel
controller. Normally, the red CAS messages
stay in place and the amber and white messages
can be scrolled up and down to review all hid-
den messages. Although highly unlikely, if
there are more red CAS messages than can be
displayed at one time, they can also be scrolled.
L E A R J E T 4 5
P I L O T T R A I N I N G M A N U A L
4-5
FOR TRAINING PURPOSES ONLY
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