will be removed from the display when
Mach decreases below .38M
I
. When
Mach is being displayed on the tape,
KIAS will be digitally displayed below
the tape. The digital readout changes
color to indicate an airplane overspeed
condition. When the airspeed trend vec-
tor equals or exceeds the overspeed in-
dicator, the color changes to amber. When
the displayed value equals or exceeds the
overspeed indicator, the color changes
to red. The color changes occur regard-
less of which airspeed computation is
shown on the tape, either IAS or Mach.
• MAX SPD Warning - The autopilot in-
corporates an overspeed protection mode
that is functional in the SPD and VS
modes. When overspeed protection mode
is active, MAX SPD is annunciated on the
PFD and the system attempts to prohibit
excursions beyond VMO/MMO. During
MAX SPD annunciation, the FD/AP will
control to a speed target to prevent over-
speed. The engaged vertical flight di-
rector mode status and reference on the
PFD do not change, even though the com-
puter is not providing guidance to this se-
lected value. Once the overspeed state is
exited, the MAX SPD annunciation is re-
moved and the flight director resumes
the previous vertical mode reference.
The FMS provides overspeed protection,
with the same PFD annunciation, when in
the VNAV mode. FMS overspeed pro-
tection is provided for VMO/MMO as
well as VFE (flap overspeed).
VERTICAL SPEED
Vertical speed (VS) indications are displayed as
an analog arc/pointer display, to the right of the
HSI (Figure 16-32). This display also provides a
digital readout, at the center of the arc, to
indicate the vertical speed, within a range of
+ 9900 fpm and with a resolution of 50 fpm. The
arc is scaled and annotated in 1000 feet per
minute increments to + 3000 fpm, with tick
marks at every 500 ft./min. The pointer/needle is
always in display and will not overwrite the
digital display.
A digital readout is also displayed above the arc
display and represents the VS target value set by
the VS on the FD. This display corresponds to
the set bug value for desired VS and has a range
of + 6000 fpm. This display also annunciates
TCAS resolution advisory information.
PFD HSI
Heading information is presented as a compass
display on the PFD. Either a full compass rose
format (HSI), a 90° partial arc format (ARC),
or a 90° map format (MAP), each with a dig-
ital readout of the airplane heading can be
displayed (Figures 16-31 thru 16-33). These
display variations are selectable through the
display controller.
On the full compass rose (HSI), airplane head-
ing is marked by an inverted triangle at the top
of the display, pointing towards the stationary
airplane symbol at the center of the compass.
On the 90° ARC and MAP displays a pointer
box at the top of the arc represents the upper
lubber line, and digitally displays the air-
plane’s current heading. The reversion head-
ing source, if selected, is annotated above the
pointer box. A heading select function is con-
trolled via the flight guidance controller, and
a command heading mode may also be se-
lected through the FMS CDU. A readout of the
selected heading is displayed to the right of the
compass rose/arc, and a corresponding head-
ing set bug is displayed on the compass that
travels along the outside edge. If the heading
select bug is off scale, while the compass dis-
play is in ARC or MAP, an arrow will point in
the direction of the heading bug. Whenever the
HDG button on the flight guidance controller
is depressed, both the digital heading display
and the heading set bug will slew to the pre-
sent heading. A single heading bug set knob
on the guidance control panel is used to si-
multaneously set the heading bug on both
PFDs and the MFD.
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
16-57
FOR TRAINING PURPOSES ONLY
FlightSafety
international