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FLIGHT DIRECTOR CONTROLS
AND OPERATION
General
The dual flight directors (FDs) provide com-
puted steering commands to the autopilot and
to the command bars on the PFDs. With the au-
topilot not engaged, either pilot can manually
fly the steering commands. The flight director
modes are synchronized in a manner that allows
selection of the modes to be accomplished by
the single set of FD mode select buttons on the
flight guidance controller (FGC) panel.
Since there is only one flight guidance controller
(FGC), both FDs will be selected to the same
lateral and vertical modes if not deselected
with the FD1 or FD2 switch. The FD on the side
the XFR arrow is pointing toward will have
priority when both FDs are on and the opposite
side FD annunciation and command bar steer-
ing will be a copy of the side having priority.
If the selected navigation source and desired
course are not the same on both PFDs, the FD
steering commands for the NAV or APP modes
will not be valid on the non-priority side.
FD Annunciation
A field at the very top, center of the PFDs, is
dedicated to FD annunciation and the AP/FD
XFR arrow (Figure 16-31). The lateral modes
annunciate to the left side of the arrow and the
vertical modes annunciate to the right side.
Armed mode annunciators are outboard on each
side of the arrow and captured mode annunci-
ators are inboard.
Armed mode annunciators appear in white,
captured or active modes are displayed in green.
Newly captured modes are boxed with a white
box for eight seconds to bring attention to the
change. If a nav signal is lost, the annunciator
will turn to amber. See Table 16-6 for a list of
lateral and vertical mode annunciations.
The FD mode select buttons on the FGC panel
have a vertical green bar that illuminates when-
ever the mode is selected (armed or captured).
FD Cue
The flight director symbology is selectable on
the display control panels. The button labeled
“CUE” will alternately select the single cue or
the cross pointer. It defaults to single cue at
power-up. The CUE will be the same on both
PFDs and the selection is determined by power
up default or the last selection made on either
display controller.
FD 1/2 Switches
The flight director select switches (FD 1 and
FD 2) are located on the upper left/right cor-
n e r s o f t h e f l i g h t g u i d a n c e c o n t r o l l e r.
Depressing these switches alone will not bring
the FD command bars into view. Any FD mode
selection causes the FD command bars to ap-
pear on both PFDs. When the FD command
bars are in view on both PFDs and the autopi-
lot is not engaged, depressing the FD 1 or FD
2 button will remove the command bars from
the PFD on that side, acting as a flight direc-
tor “clear” function. Pressing the opposite side
FD switch will disengage all FD modes and
remove the command bars on that side as well.
With the autopilot engaged, the FD command
bars will be in view at all times on the coupled
side and cannot be removed from the PFD. The
opposite side FD command bars can be re-
moved from view by depressing the appropri-
ate FD 1 or FD 2 button (as desired). If desired,
both sides can be selected off when the AP is
not engaged.
Course Set Knobs
A course set knob (CRS 1 and CRS 2) is located
at each end of the FGC panel. These knobs are
used to individually set the courses on the left
and right PFD HSI displays. They are used pri-
marily to set the course for a VOR radial or LOC
course. The course knobs have a push button in
the center to synchronize the display to the air-
planes “direct-to” course.
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
16-85
FOR TRAINING PURPOSES ONLY
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