INDICATIONS
PRIMARY AND SECONDARY
DISPLAYS
The primary display of pressurization status
is located on the pressurization control panel.
In automatic mode, the CPCS display (Figure
12-4) reports the cabin rate, the delta P and the
cabin altitude. When manual is selected, the
cabin rate includes a “MR” caption. When the
landing field elevation is being set, the display
temporarily replaces the cabin altitude dis-
play. The display on the cabin pressure con-
troller is provided through the secondary
channel of the CPC only. If that channel has
lost power or failed, the display will be blank.
The pressurization display on the EICAS/MFD
ECS page can be driven by either channel of
the CPC.
Cabin altitude (CAB ALT) is displayed on the
CPC, on the EICAS/MFD SUMRY page, and
on the EICAS/MFD ECS system schematic
page (Figure 12-2).
Selection of the ECS menu on either the EICAS
or MFD brings into view the environmental
control system schematic display (Figure 12-
2). The CPCS data displayed on EICAS and
MFD changes color from cyan to amber, and
to red to alert the crew of exceedances. Those
exceedances also send a signal to the EICAS
and are displayed as CAS messages (Table
12-1).
On the ECS display the cabin altitude rate
change is annunciated as a digital readout ac-
companied by an up arrow for climb conditions
and by a down arrow for descent rate changes.
Manual rate is shown separately but is the
same format when in the manual mode.
The delta P display is boxed and changes color
from white to amber when the differential
pressure is less than -0.5 or greater than 9.5
psid in the automatic mode. The delta P dis-
play changes to red if the value is greater than
9.9 psid.
The cabin altitude display on the ECS system
schematic changes color from white to amber,
and to red based upon cabin altitude ex-
ceedances. When the cabin altitude has ex-
ceeded 8,750 feet, the display digits are shown
in amber and are boxed in amber. When cabin
altitude exceeds 10,000 feet, the digits and
box both turn red (Figure 12-5). Also, when
the cabin altitude exceeds 10,000 feet, the
“CABIN ALTITUDE” voice message will
sound.
The “CABIN ALTITUDE” voice message can
be muted by depressing the MUTE switch on
the right thrust lever, but it will reactivate in
60 seconds if the cabin is still above 10,000
feet.
Depressing either master WARN/CAUTION
light/switch will cause the flashing displays
to become steady.
When invalid signals are processed or a test
is performed with the ECS menu selected for
display, the digits are replaced with amber
dashes (Figure 12-5).
CAS MESSAGES
CPCS advisory and caution messages, when
activated, are sent from the cabin pressure
controller through DAU1 to EICAS for display.
12-8
FOR TRAINING PURPOSES ONLY
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
FlightSafety
international
3 5 0
I . 2
I 3 0 0
CABIN PRESSURE CONTROL
CAB RATE
DELTA P
CAB ALT
FPM
PSID
FT
LDG ALT
DN
UP
MANUAL
DN
UP
PRESSURIZATION
Figure 12-4. Primary CPCS Display on
Pressurization Control Panel