
CAS MESSAGE INHIBIT MODE
OF OPERATION
General
During takeoff and landing an inhibit mode
logic automatically prevents certain caution
and advisory CAS message displays until the
takeoff/landing phase is completed. This mode
also prevents the master CAUT light and chime
from activating should the CAS message be
amber. Once the inhibit mode is deactivated,
a CAS message will display immediately if the
condition is still valid, the master CAUT light
will illuminate and the chime will sound (for
caution messages). If a CAS message had been
activated prior to entering the inhibit mode, and
then the condition that tripped the caution be-
comes invalid while in the inhibit mode, the
message will continue to be displayed even
though the malfunction is no longer present.
In this situation, once the inhibit mode is de-
activated, the message will then disappear
from the CAS window. When the CAS mes-
sages are inhibited for takeoff or landing a
“CAS TAKEOFF INHIBITED” or a “CAS
LANDING INHIBITED” message appears
above the menu on the EICAS. See example
in Figure 4-1.
The inhibit mode does not inhibit master
warning annunciation, master warning tone,
any warnings on the CWP or CAS warning
messages.
Takeoff Inhibit
During takeoff roll, annunciation of amber or
white CAS messages that would not influence
the pilot’s decision to abort or to continue the
takeoff may present a distraction.
See Table 4-2 for a listing of which CAS mes-
sages are inhibited for takeoff. The takeoff
inhibit feature is automatically enabled when
all
of the following conditions are met:
• Both thrust levers are above the MCR detent.
• The airspeed is above 40 KIAS.
• Both squat switches are in the ground
mode.
Once airborne, or following an aborted take-
off, the inhibit mode is automatically disabled
by
any
one of the following:
• Prior to takeoff phase or an aborted take-
off (either squat switch in ground mode and
either thrust lever in idle and airspeed is
below 40 knots).
• Completion of takeoff phase (transition
from ground to air mode, plus 30 seconds).
• Completion of takeoff phase (valid radio
altitude above 400 feet AGL).
The takeoff inhibit mode will also be deacti-
vated by
any
of the following:
• Radio altimeter invalid.
• Indicated airspeed invalid.
• Takeoff inhibit mode has been enabled for
more than 60 seconds.
Landing Inhibit
Similar to the takeoff inhibit mode, some cau-
tion and advisory CAS messages are auto-
matically inhibited during the landing. See
Table 4-2 for a listing of CAS messages that
are inhibited for landing.
The landing inhibit mode is enabled when
all
of the following conditions are met:
• Both thrust levers are below the MCR detent.
• Radio altimeter below 400 feet.
• Landing gear is down and locked.
• Both squat switches in air mode.
The landing inhibit mode is automatically dis-
abled by
any
one of the following:
• Completion of landing (either squat switch
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
4-7
FOR TRAINING PURPOSES ONLY
FlightSafety
international