• Low speed awareness (LSA) The low
speed awareness bar tape overlays the air-
speed/mach tape and extends upwards
from the bottom of the display.
Representing the stick shaker speed, the
low speed limit is calculated by the IC-600
based upon angle of attack, as provided
by the stall computer. Both low speed
awareness displays are removed with
weight on wheels except during stall test.
• Vspeeds – Airspeed references (V1, VR
and V2) can be displayed on the airspeed
scale. The references can be set auto-
matically by the FMS or manually through
the MFD bezel menu controller. Upon
power-up of the avionics, the default
source for the Vspeeds will be from the
FMS. Following initialization of the FMS,
the operator will normally enter the flight
plan, confirm airplane fuel and weight on
the FUEL page, and then enter takeoff
configuration and conditions on the PERF
(performance) page of the FMS. When
the Vspeeds are confirmed on the PERF
page, they are automatically set on the
airspeed scale. This automatic function
can be deselected on the MFD Vspeed
menu and the FMS speeds can be manu-
ally overridden.
When on the ground and below 40 KIAS,
the Vspeeds and currently set values are
listed (digital readouts) in the bottom
half of the airspeed tape (Figure 16-35).
During takeoff acceleration, the digital
readouts go out of view as the airspeed
tape moves down and the Vspeed refer-
ences will come into view (Figure 16-
32). V1 and VR are removed from the
airspeed tape when the airplane becomes
airborne and V2 is automatically removed
at V2 + 40 KIAS.
With FMS as the default, pilot access to
the MFD Vspeed bezel menu is not nec-
essary, but can be used if desired to man-
ually set the Vspeed.
With FMS installed, a white “T”, rotated
90° and labeled “RF” (VREF), reference
mark can also be displayed on the air-
speed scale (Figure 16-32). When land-
ing performance is confirmed on the FMS
CDU, the FMS will compute the final ap-
proach reference speed (VREF). The sym-
bol is a function of FMS computed gross
weight and selected flap position and the
reference will change as flap position is
changed, or the crew can select a flap
setting and the FMS will continue to com-
pute the speed for that flap setting as the
airplane gross weight decreases. The
choice to display or not display the sym-
bol on the airspeed scale is selectable on
the FMS. There is also the option to add
a factor to the FMS computed speed for
wind gusts or abnormal conditions.
• Mach/IAS digital readout – A digital
readout of the indicated airspeed/mach is
displayed directly beneath the airspeed
tape (Figures 16-33 and 16-34). If IAS is
displayed on the tape, the equivalent
Mach will be digitally displayed beneath
the tape when Mach exceeds .39M
I. It
LEARJET 45 PILOT TRAINING MANUAL
16-56
FOR TRAINING PURPOSES ONLY
FlightSafety
international
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