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Heading Set Knob
Heading is selected via a rotary knob. The HDG
knob controls the heading bug and digital dis-
play on both PFDs and the bug on the MFD
MAP display. Depressing the HDG knob will
synchronize the HDG bug on all display units
to the airplane’s current heading.
Basic AP/FD Modes
Heading Hold Mode (Wings Level)
This is the basic lateral mode when the au-
topilot is engaged, no other lateral FD mode is
selected and the bank angle is less than 6°. The
AP will roll the airplane to wings level and an-
nunciate “ROL” on the PFD.
Roll Hold Mode
The autopilot roll hold mode is operational
when the autopilot is engaged, no lateral FD
mode is selected and the bank angle is greater
than 6°, but less that 34°. The AP maintains the
established bank angle. The ROL annunciator
will be displayed on the PFD.
Pitch Hold Mode
If no vertical modes are captured, the AP holds
the pitch attitude that existed at the time the AP
was engaged.
If the autopilot is not engaged, selecting a FD
lateral mode with no active FD vertical mode
displayed will cause the FD command bars to
sync to the existing pitch attitude. The “PIT”
annunciator will be displayed on the PFD in this
vertical FD mode.
FD Lateral Modes
HDG (Heading)
Heading select is used to maintain a magnetic
heading. The heading bug is positioned to the
desired heading on the HSI using the HDG knob
on the FGC. The heading bug may be sync’ed
to the existing heading by depressing the inner
button on the HDG set knob.
Depressing the FD “HDG” select button en-
gages the heading mode and displays a green
“HDG” annunciation on the PFDs. The FD
command bars will command a turn in the di-
rection the heading bug was moved to achieve
the set heading.
If the heading knob is tuned so as to move the
heading bug the long way (over 180°) to a
new heading, the FD will command the turn
in that direction (only when airborne).
The heading select mode is canceled when any
armed lateral mode captures or if GA is selected.
BNK (Bank)
Pressing this button alternately selects or de-
selects a reduced maximum bank angle of 14°
on both FDs when in FD HDG mode. When se-
lected, a green low bank arc appears on the top
of the ADIs.
BNK automatically engages at 41,600 feet if
HDG or NAV (VOR) modes are active.
NAV (Navigation)
Pressing the FD NAV button alternately selects
and deselects the navigation mode. The NAV
mode is normally used to intercept route seg-
ments identified with VOR radials and to in-
tercept and fly desired FMS tracks (SIDs,
routes, holding and STARs). NAV or APP can
also be used to intercept and track LOC and
LOC BC, but for a full ILS (LOC and GS) the
APP mode must be used.
NAV (VOR)
When using the FD NAV mode to intercept and
track a VOR radial, it is first necessary to tune
one of the nav receivers to the desired station,
select VOR 1 or 2 (whichever was tuned) as the
nav source and set the desired course. Normally,
the on-side nav receiver will be used as the ac-
tive nav source. The operator must establish an
intercept heading and then the flight guidance
computer will generate lateral commands to
capture (intercept), and fly the selected course.
Deselecting NAV (VOR/ILS) with NAV armed
results in HDG 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
16-86
FOR TRAINING PURPOSES ONLY
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